研究等業績 - その他 - 柴山　敦

Lithium Ore Beneficiation: Sustainable Approaches for Efficient Recovery of Lithium from a Low-Grade Spodumene Ore

Sagzhanov D.

Journal of Sustainable Metallurgy ( Journal of Sustainable Metallurgy )  11 ( 2 ) 754 - 772   2025年06月

DOI

Selective Leaching of Copper and the Removal of Arsenic from Enargite Using High-pressure Oxidative Leaching

GODIRILWE Labone L., HAGA Kazutoshi, OINUMA Ryuji, BATNASAN Altansukh, SHIBAYAMA Atsushi

環境資源工学 ( 一般社団法人 環境資源工学会 )  71 ( 3 ) 138 - 144   2025年

<p>High arsenic (As) content in copper ores and concentrates poses challenges to the smelting/converting process, particularly the environmental implications of arsenic emissions. As an alternative, high-pressure oxidative leaching (HPOL) of enargite ore was investigated in this study to achieve selective dissolution of copper and separation of arsenic from high arsenic-containing copper ore. The effects of leaching conditions such as the type of leaching medium, leaching temperature, and total pressure, were investigated. Ferric sulfate (Fe₂(SO₄)₃) was used as the leaching medium under optimized leaching conditions (160°C and 1.0 MPa total pressure). The results showed that the dissolution of copper from enargite ore was limited to around 65%, due to the agglomeration and passivation of mineral particles caused by elemental sulfur, as shown by SEM-EDS. However, the addition of NaCl as an additive significantly improved the copper dissolution rate to about 82%, while about 98% of arsenic was removed as scorodite (FeAsO₄•2H₂O).</p>

DOI CiNii Research

Beneficiation of Low-Grade Lithium Ores from Eastern Kazakhstan by Dense Media Separation (DMS) and Froth Flotation

Sagzhanov D.

Minerals, Metals and Materials Series ( Minerals, Metals and Materials Series )    201 - 213   2024年

LithiumLithium is one of the critical elements required for clean energy technology to achieve a carbon-neutral target. In this study, the beneficiation ofLow-grade spodumene ore a low-grade spodumene ore (0.3–0.6% Li2O) from Eastern Kazakhstan is investigated by dense medium separation (DMS)Dense Medium Separation (DMS) and froth flotationFlotation to obtain lithiumLithium concentrate. The main gangue minerals in the spodumene ore are feldspar, quartz and mica. The highest lithiumLithiumgrade in concentrate from DMSDense Medium Separation (DMS) of 1000/+ 850 µm size fractions of the low-grade spodumene oreLow-grade spodumene ore is achieved at approximately 5.7% from 0.6% (Li2O), with a recoveryRecovery of about 90%. Furthermore, the spodumene ore is beneficiated by reverse flotationFlotation using NaOL and DAA as mixed collectorsMixed collector. The maximum lithiumLithiumrecoveryRecovery of approximately 30% with the highest lithiumLithium grade of 1.0% was obtained from a low-grade spodumene oreLow-grade spodumene ore under flotationFlotation condition of 1000 g/t NaOL/DAA, ratio of 1:5, pH 10. Conditioning the pulp with starch has little effect on the flotationFlotationrecoveryRecovery of lithiumLithiumfrom low-grade spodumene oreLow-grade spodumene ore improving lithiumLithium grade from 1.0 to 1.45%.

DOI

Establishment of a Hydrometallurgical Scheme for the Recovery of Copper, Nickel, and Cobalt from Smelter Slag and Its Economic Evaluation

Godirilwe L.L.

Sustainability (Switzerland) ( Sustainability (Switzerland) )  15 ( 13 )   2023年07月

DOI

Tin Recovery from WPCBs by Immersion Using Lead-Tin Molten Metal

Ueda S.

World of Metallurgy - ERZMETALL ( World of Metallurgy - ERZMETALL )  76 ( 4 ) 261 - 266   2023年07月

Waste printed circuit boards (WPCBs) contain a variety of metals, including copper, tin, and precious metals, some of which are valuable. These raw materials are called "urban mines (E-scrap)" and have attracted much attention. Among these, this study focused on solder used on circuit boards. The main component of solder is tin, with trace amounts of silver and copper. Tin has a relatively low melting point among metals and is easy to process. Currently in Japan, WPCBs are mainly recycled via copper smelting with concentrate. However, tin is preferentially oxidized in copper smelting and is mostly dispersed in slag. Currently, the recycling rate of tin in Japan is extremely low at about 8 % [1]. Furthermore, the establishment of a high recovery rate technology for tin is still inadequate. The objective of this study is to improve the tin recycling rate by recovering tin at an earlier stage before feeding the WPCBs into a copper smelting furnace. Therefore, this study focused on the immersion method in lead-tin molten solution as a method to selectively recover solder from WPCBs using the dry smelting method. In the experimental method, WPCBs were immersed in a molten lead-tin alloy solution for a certain amount of time. Subsequently, evaluations were conducted on the substrate side and the alloy side. Optimal conditions for the immersion method were studied and basic tests were conducted to achieve a solder recovery rate of more than 70 % from the WPCBs. The results confirmed that the solder recovery rate by the immersion method was more than 80 % within one minute. This suggests that the immersion method can achieve a high recovery rate in a short time by using a highly conductive alloy. In the future, the continuous immersion testing of substrates and efficient testing conditions will continue to be studied to work toward actual operation.

Recovery of Pd(II) by solvent extraction with a dithiophenol-based extractant from the undiluted leachate of spent automotive catalysts followed by water scrubbing and thiourea stripping

Yamada M.

Hydrometallurgy ( Hydrometallurgy )  215   105986 - 105986   2023年01月

DOI

Copper Recovery from Chalcopyrite Concentrate by Oxidative Roasting and Acid Leaching

Tumen-Ulzii N.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  25 ( 1 ) 56 - 62   2022年

<p>In this study, a combined process consisting of salt roasting and acid leaching was conducted to recover copper per sulphide concentrate with 43.5% of chalcopyrite. The chalcopyrite concentrate was roasted in the absence and the presence of potassium chloride (mass ratio of concentrate:KCl from 1:0.5 to 1:0.9) at various temperatures (400-600°C) and different roasting times (1-4 hours) under air atmosphere. The roasted concentrate was dissolved in sulphuric acid solution (60 g/L) with a solid-liquid ratio of 1:8 at an ambient temperature for 2 hours. The chalcopyrite concentrate, roasted samples, and leached residues were analyzed using atomic absorption spectrometry, UV-VIS spectrophotometer, and X-ray diffractometer. Thermogravimetry and differential thermal analyses were applied on the chalcopyrite concentrate and the concentrate with KCl up to 1000°C. Results showed that about 80% and 90% of chalcopyrite decomposed under the conditions with the copper concentrate:KCl ratio of 1:0.6, roasting time of 2 hours at 500°C and 550°C, respectively. The DTA-TG analyses revealed variant phase regions associated with chalcopyrite decomposition through the roasting. Copper dissolution with the sulphuric acid solution from the roasted concentrates was over 99.7% and 99.0% under the determined conditions. The thermodynamic stability of chalcopyrite with KCl was discussed by calculating Gibb's free energy.</p>

DOI CiNii Research

Process Development for Gold Concentrate Recovery by Multi-stage Flotation using Optimized Conditions

Tun N.W.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  25 ( 2 ) 235 - 242   2022年

<p>A pre-treatment method for upgrading gold from a polymetallic gold-zinc-lead ore by flotation was studied. X-ray diffraction analysis of the gold sulfide ore showed that quartz, calcite, pyrite, sphalerite, and galena are the main constituents of the ore. The composition of the polymetallic ore contained 6.49 ppm Au, 3.48% Zn, 1.25% Pb, 17.98% Fe, and 20.36% S. Due to the complexity of the polymetallic ore, the gold recovery is generally low. The objective of this study is to develop a primary flotation process to recover gold in a bulk sulfide concentrate. The effects of particle size, collector type, flotation time, and the slurry pH on the recoveries and grades of gold, zinc, and lead were investigated. The developed flotation process consisted of rougher, scavenger, and cleaner stages. High recovery of gold was found to be linked with a high recovery of Pb which was achieved by the utilization of a mixture of collector AERO 7249 and PAX. The gold flotation kinetics were fast with more than 50% of gold recovered within 5 minutes of flotation. Under optimized flotation conditions with rougher, scavenger, and cleaner stages, a total gold recovery of 88.36 % and a final gold grade of 60.97 ppm were obtained. A total gold enrichment ratio of 9.4 was achieved, confirming the viability of the flotation method in upgrading the gold from the polymetallic sulfide ore prior to further processing.</p>

DOI CiNii Research

Removal of Silicon, Aluminum and Phosphorus Impurities from Low-grade Iron Ore by Reverse Froth Flotation and Alkaline Roasting

Batnasan A.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  25 ( 1 ) 122 - 128   2022年

<p>In this paper, the removal processes for silicon (Si), aluminum (Al) and phosphorus (P) impurities from low-grade iron ore, in which hematite (Fe₂O₃), goethite (FeO(OH)), and quartz (SiO₂) are the main mineral constituents, have been presented. The reverse froth flotation process was applied to remove silicon and aluminum impurities from the iron ore using dodecyltrimethylammonium bromide (DTAB) and dodecylamine acetate (DAA) cationic collectors at a broad slurry pH ranging from 2 to 12. Whereas alkaline roasting followed by a water washing process was employed to remove phosphorus impurity from the iron ore under the various sodium hydroxide concentrations, different roasting temperatures, and prolonged varying times. Results showed that the maximum removal rate of SiO₂ and Al₂O₃ achieved were 58.3% and 31.0% via reverse froth flotation using DTAB collector at pH 12, whereas 38.7% SiO₂ and 10.0% Al₂O₃ with DAA collector. The level of total (SiO₂+Al₂O₃) impurities in the tailing as iron ore product from the reverse flotation was reduced from 7.4 mass% to 4.4 mass% as the initial level. On the other hand, about 61% of phosphorus in the iron ore was removed by the combined alkaline roasting and water washing at the conditions optimized as 50 g/kg-ore NaOH at 300°C for 0.5 h. The grade of phosphorus impurity reached 0.04 mass% from 0.09 mass% (initial grade). Simultaneously, the iron grade and level of SiO₂+Al₂O₃ impurity in the iron ore product from reverse flotation of the low-grade iron ore with DTAB collector reached 60.0 mass% and 4.4 mass%, which are acceptable levels for ironmaking.</p>

DOI CiNii Research

The Role of Lead in Suppressing Passivation of High Silver-Containing Copper Anodes During Electrorefi ning

Godirilwe L.L.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  25 ( 1 ) 137 - 144   2022年

<p>Passivation behavior of high silver containing copper anodes was investigated using slowly cooled Cu- 1%Ag anodes of different lead (Pb) concentrations. The addition of Pb distributes silver in the Pb phase and reduces the amount of silver that is solidly soluble in copper and, thus, generates a fine silver powder on the anode surface which is a main contributing factor of passivation. Electrorefining experiments were conducted using a synthetic electrolyte containing 40 g/L Cu²⁺ and 180 g/L H₂SO₄, at 60°C. SEM-EDS analysis was used to study the resulting anode slime and showed that increasing Pb content altered the anode slime structure from fine and compact to porous and less adherent to the anode surface. Utilizing a Cu-1%Ag0.2%Pb anode yielded the longest passivation time with a low and stable cell voltage of 0.1V. The slime morphology was characterized by precipitated metallic silver particles either as inclusion or loosely present on the surface of the abundant complex Cu-Ag-Pb sulfate type of compounds. Because of the economic importance of silver recovery from the anode slime, understanding its behavior during electrorefining will enable operating with high impurity anodes especially in secondary copper processing where metallic impurities can result from e-waste and copper alloy scrap.</p>

DOI リポジトリ CiNii Research

Environmentally friendly Pd(II) recovery from spent automotive catalysts using resins impregnated with a pincer-type extractant

Yamada M.

Scientific Reports ( Scientific Reports )  11 ( 1 )   2021年12月

DOI

Extraction of copper from complex carbonaceous sulfide ore by direct high-pressure leaching

Godirilwe L.L.

Minerals Engineering ( Minerals Engineering )  173   2021年11月

DOI

鉱物処理の研究から展開した過熱水蒸気による基板リサイクルと溶媒抽出用「抽出剤」に関する研究

柴山 敦, 山田 学, 川村 茂, 芳賀 一寿

金属   91 ( 10 ) 863 - 866   2021年10月

Copper recovery and reduction of environmental loading from mine tailings by high‐pressure leaching and sx‐ew process

Godirilwe L.L.

Metals ( Metals )  11 ( 9 )   2021年09月

DOI

Investigation of Phosphorus Removal and Dephosphorization Effect from Iron Ore During Alkaline Roasting and Wet Grinding

A. Shibayama, K. Haga, A. Batnasan, M. Mizutani, K. –I. Higuchi

Proceedings of the XXX International Mineral Processing Congress(IMPC2020)     2359 - 2370   2021年04月

Removal of Silica from High Silica Containing Zinc Concentrate by Regrinding and Flotation

K. Haga, T. Ono, A. Batnasan, Y. Takasaki, S. Kawamura, A. Shibayama

Proceedings of the XXX International Mineral Processing Congress(IMPC2020)     2078 - 2087   2021年04月

Selective Extraction of Nickel, Copper and Cobalt from a Smelter Slag in Botswana

L. Godirilwe, K. Haga, G. Danha, Y. Takasaki, A. Shibayama

Proceedings of the XXX International Mineral Processing Congress(IMPC2020)     2451 - 2461   2021年04月

選鉱プロセスにおけるハイパースペクトルイメージングと深層学習を用いたヒ素含有鉱石の分類

岡田 夏男, 前川 陽平, 大和田 済熙, 芳賀 一寿, 柴山 敦, 川村 洋平

資源・素材学会誌 ( 一般社団法人 資源・素材学会 )  137 ( 1 ) 1 - 9   2021年

<p>Currently, there have been issues concerning the depletion and scarcity of mineral resources. This is mostly due to the excavation of high grade minerals having already occurred years and years ago, hence forcing the mining industry to opt for the production and optimization of lower grade minerals. This however brings about a plethora of problems, many of which economic, stemming from the purification of those low grade minerals in various stages required for mineral processing. In order to reduce costs and aid in the optimization of the mining stream, this study, introduces an automatic mineral identification system which combines the predictive abilities of deep learning with the excellent resolution of hyperspectral imaging, for pre-stage of mineral processing. These technologies were used to identify and classify high grade arsenic (As) bearing minerals from their low grade mineral counterparts non-destructively. Most of this ability to perform such tasks comes from the highly versatile machine learning model which employs deep learning as a means to classify minerals for mineral processing. Experimental results supported this statement as the model was able to achieve an over 90% accuracy in the prediction of As-bearing minerals, hence, one could conclude that this system has the potential to be employed in the mining industry as it achieves modern day system requirements such as high accuracy, speed, economic, userfriendly and automatic mineral identification.</p>

DOI

選鉱プロセスにおけるハイパースペクトルイメージングと深層学習を用いたヒ素含有鉱石の分類

岡田夏男, 前川陽平, 大和田済熙, 芳賀一寿, 柴山 敦, 川村洋平

Journal of MMIJ   137 ( 1 ) 1 - 9   2021年

Automated identification of mineral types and grain size using hyperspectral imaging and deep learning for mineral processing

Okada N.

Minerals ( Minerals )  10 ( 9 ) 1 - 22   2020年09月

DOI

Surface properties of copper-sulfide minerals with sodium-hydrosulfide activation

Matsuoka H.

Minerals Engineering ( Minerals Engineering )  156   2020年09月

DOI

Recovery Rates of Used Rechargeable Lithium-Ion Battery Constituent Elements in Heat Treatment

Murakami Y.

Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science ( Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science )  51 ( 4 ) 1355 - 1362   2020年08月

DOI

Erosion mechanism of refractories in a pyro-processing furnace for recycling lithium-ion secondary batteries

Murakami Y.

Ceramics International ( Ceramics International )  46 ( 7 ) 9281 - 9288   2020年05月

DOI

Upgrading the iron from low-grade and high-silicate iron ores by magnetic separation

Haga K.

World of Mining - Surface and Underground ( World of Mining - Surface and Underground )  72 ( 3 ) 157 - 161   2020年05月

Recovery of Pd(II) from leach solutions of automotive catalysts by solvent extraction with new thiophosphate extractants

Yamada M.

Hydrometallurgy ( Hydrometallurgy )  191   2020年01月

DOI

Investigation of flotation conditions for treatment of arsenic-bearing copper ore

Bayarmagnai E.

15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019 ( 15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019 )    2020年

Automated Identification of Mineral Types and Grain Size Using Hyperspectral Imaging and Deep Learning for Mineral Processing

N. Okada, Y. Maekawa, N. Owada, K. Haga, A. Shibayama, Y. Kawamura

Minerals   10 ( 809 )   2020年

Surface Properties of Copper-Sulfide Minerals with Sodium-Hydrosulfide Activation

H. Matsuoka, K. Mitsuhashi, M. Kawata, T. Kato, C. Tokoro, K. Haga, A. Shibayama

Minerals Engineering   156   2020年

Upgrading the Iron from Low-Grade and High-Silicate Iron Ores by Magnetic Separation

K. Haga, B. Altansukh, M. Mizutani, K. Higuthi, A. Shibayama

World of Mining   72 ( 3 ) 157 - 161   2020年

Selective and Preferential Separation of Rhodium (III) from Palladium (II) and Platinum (IV) Using a m-Phenylene Diamine-Containing Precipitant

Matsumoto K.

Scientific Reports ( Scientific Reports )  9 ( 1 )   2019年12月

DOI

High-pressure oxidative leaching and iodide leaching followed by selective precipitation for recovery of base and precious metals from waste printed circuit boards ash

Batnasan A.

Metals ( Metals )  9 ( 3 )   2019年03月

DOI

Recovery of Pd(II) and Pt(IV) from leach liquors of automotive catalysts with calixarene-based di-n-alkylamino extractants in saturated hydrocarbon diluents

Yamada M.

Hydrometallurgy ( Hydrometallurgy )  184   103 - 108   2019年03月

DOI

Applying analysis of mineral surfaces to predict flotation behavior

Matsuoka H.

IMPC 2018 - 29th International Mineral Processing Congress ( IMPC 2018 - 29th International Mineral Processing Congress )    1481 - 1488   2019年

Copper recovery and arsenic removal from enargite ores and concentrates during high pressure oxidative leaching

Shibayama A.

IMPC 2018 - 29th International Mineral Processing Congress ( IMPC 2018 - 29th International Mineral Processing Congress )    2539 - 2548   2019年

Gold recovery from waste printed circuit boards by advanced hydrometallurgical processing

Altansukh B.

Materials Transactions ( Materials Transactions )  60 ( 2 ) 287 - 296   2019年

<p>The scope of this study was to improve the hydrometallurgical processes involving iodine-iodide leaching and precipitation for recovery of gold from waste printed circuit boards. Firstly, the influence of different precipitating agents, namely ascorbic acid, trisodium citrate and sodium hydroxide on the recovery of gold from gold-iodide leach liquor were investigated in order to define the most effective precipitating agent. The leach liquor was prepared by dissolving pure gold chips in 1:6 molar ratio of iodine-iodide solution at 40°C, 550 rpm for 12 h. The variables, which affect the efficiency of gold precipitation from the leach liquor, were the molar ratio of precipitating agents to gold, pH and redox potential of the solutions. The attained high gold precipitation efficiency from the leach liquor was more than 99% under the highly acidic (pH < 1.6) and alkaline conditions (pH > 13) induced by 0.1 M ascorbic acid and 0.1 M sodium hydroxide respectively, but 64.5% of gold at a weak alkaline condition (pH 8) with 0.1 M trisodium citrate. Secondly, physico-chemical properties of resultant colloidal solutions and prepared gold particles were examined. Finally, recycling of waste printed circuit boards (WPCBs) via iodine-iodide leaching followed by the ascorbic acid reduction was discussed. Results indicate that over 95% of gold extracted from WPCBs by two-step iodine-iodide leaching under the defined conditions, while the dissolution efficiencies of other precious metals (Ag, Pd) and metal impurities (Cu, Al, Fe, Ni, Pb and Zn) were less than 1% and 3%, respectively. The vast majority of Au (99.8%), Cu (95.6%) and Ag (76.8%) were precipitated from the pregnant leach solution by ascorbic acid reduction at ambient conditions.</p>

DOI

Leaching of gold from waste printed circuit boards in an iodineiodide solution and regeneration of the spent lixiviant

Batnasan A.

IMPC 2018 - 29th International Mineral Processing Congress ( IMPC 2018 - 29th International Mineral Processing Congress )    3072 - 3080   2019年

Pressure leaching of carbonaceous sulfide concentrates for recovery of copper and iron

Magwaneng R.

IMPC 2018 - 29th International Mineral Processing Congress ( IMPC 2018 - 29th International Mineral Processing Congress )    4023 - 4031   2019年

Recovery of rare earth elements and phosphorus from apatite ore by leaching and precipitation

Haga K.

IMPC 2018 - 29th International Mineral Processing Congress ( IMPC 2018 - 29th International Mineral Processing Congress )    2588 - 2595   2019年

Removal of silica and bromine from waste printed circuit boards via superheated steam treatment and dense medium separation

Haga K.

Proceedings of the 10th European Metallurgical Conference, EMC 2019 ( Proceedings of the 10th European Metallurgical Conference, EMC 2019 )  3   983 - 991   2019年

Treatment of Spent LED Light Bulbs for Recycling of Its Components: A Combined Assessment in the Context of LCA and Cost-Benefit Analysis

DODBIBA Gjergj, OSHIKAWA Hiroki, PONOU Josiane, KIM Yonggu, HAGA Kazutoshi, SHIBAYAMA Atsushi, FUJITA Toyohisa

環境資源工学 ( 環境資源工学会 )  66 ( 1 ) 15 - 28   2019年

<p>Recently, the demand for LED light bulbs is rapidly increasing due to an increasing demand for energy saving lightning options. In this work, the elemental composition of LED light bulbs is first analyzed, and then a flowsheet for recovering LED chips and other valuable metals from spent LED light bulbs is put forward. The suggested flowsheet includes eddy current separation (ECS) and air tabling, in addition to several refining processes. The experimental results indicated that the eddy current separation and the air tabling are useful techniques for sorting components of LED bulbs, enabling the recycling of aluminium, plastics, and precious metals, such as gold and silver. Next, five different scenarios for treatment of spent LED light bulbs were considered and a combined life cycle assessment (LCA) and cost-benefit analysis was carried out to find out the most suitable alternative. The results of the combined assessment suggested that the recycling of mainly Al and plastics from spent LED bulbs is an environmentally friendly and cost-effective alternative.</p>

DOI

Erosion Mechanism of Refractories in a pyro-processing Furnace for Recycling Lithium-ion Secondary Batteries

Y. Murakami, Y. Matsuzaki, T. Kamimura, T. Nishiura, K. Masuda, A. Shibayama, R. Inoue

Ceramics International   46   9281 - 9288   2019年

Gold Recovery from Waste Printed Circuit Boards by Advanced Hydrometallurgical Processing

B. Altansukh, K. Haga, H. H. Huang, A. Shibayama

Materials Transactions   60 ( 2 ) 287 - 296   2019年

Investigation of Flotation Conditions for Treatment of Arsenic-bearing copper Ore

B. Enkhzul, K. Haga, A. Shibayama

Proceedings of the 15th International Symposium on East Asian Resources Recycling Technology (EARTH2019)     226 - 231   2019年

Metal Recovery and Reducing of Environmental loading of Copper Mine Tailings by High Pressure Leaching and SX-EW Process

K. Haga, L. Godirilwe, Y. Takasaki, D. Ishiyama, A. Shibayama

Proceedings of the 58th Annual Conference of Metallurgists[COM] Hosting The 10th International Copper Conference 2019   ( 594790 )   2019年

Recovery of Copper and Iron from Rougher Concentrate of Carbonaceous Copper Ore by Pressure Leaching

K. Haga, R. Sagami, T. Kawasaki, H. Matsuoka, K. Mitsuhashi, M. Kawata, A. Shibayama

Proceedings of the 15th International Symposium on East Asian Resources Recycling Technology (EARTH2019)     261   2019年

Removal of Silica and Bromine from Waste Printed Circuit Boards Via Superheated Steam Treatment and Dense Medium Separation

K. Haga, K. Shichiji, S. Kawamura, Y. Takasaki, A. Shibayama

Proceedings of EMC2019   3   1 - 9   2019年

Selective and Preferential Separation of Rhodium (III) from Palladium (II) and Platinum (IV) Using a m-Phenylene Diamine-Containing Precipitant

K. Matsumoto, S. Yamakawa, K. Ishibashi, M. Jikei, A. Shibayama

Scientific Reports   9 ( 1 )   2019年

Selective Extraction of Copper from Copper Concentrates Containing High-Arsenic Under High Pressure Oxidative Leaching

A. Shibayama, A. Batnasan, K. Haga

Proceedings of the 58th Annual Conference of Metallurgists[COM] Hosting The 10th International Copper Conference 2019   ( 594003 )   2019年

Separation of Silica from Zinc Silicate Leachate and Improvement of Filterability Using Addition Method

M. Kakazu, S. Kawamura, Y. Takasaki, K. Haga, A. Shibayama

Proceedings of the 15th International Symposium on East Asian Resources Recycling Technology (EARTH2019)     540 - 544   2019年

The Effect of Pb Addition on Passivation Behavior of High Silver-Containing Copper Anode During Electrorefining

L. Godirilwe, Y. Takasaki, S. Kawamura, K. Haga, A. Shibayama, R. Sato, Y. Takai

Proceedings of the 15th International Symposium on East Asian Resources Recycling Technology (EARTH2019)     383 - 387   2019年

Rapid and selective recovery of palladium from platinum group metals and base metals using a thioamide-modified calix[4]arene extractant in environmentally friendly hydrocarbon fluids

Yamada M.

Scientific Reports ( Scientific Reports )  8 ( 1 )   2018年12月

DOI

Nano Bubble and Emulsion Size Distribution Measurement by Interactive Force Apparatus

FUJITA Toyohisa, KUROSE Takeshi, PONOU Josiane, DODBIBA Gjergj, SHIBAYAMA Atsushi, OTSUKI Akira

International Journal of the Society of Materials Engineering for Resources   23 ( 2 ) 158‐161 - 161   2018年09月

J-GLOBAL

Recovery of light and heavy rare earth elements from apatite ore using sulphuric acid leaching, solvent extraction and precipitation

Battsengel A.

Hydrometallurgy ( Hydrometallurgy )  179   100 - 109   2018年08月

DOI

Calix[4]arene-based amino extractants containing n-alkyl moieties for separation of Pd(II) and Pt(IV) from leach liquors of automotive catalysts

Yamada M.

Metals ( Metals )  8 ( 7 )   2018年07月

DOI

Development of copper recovery process from flotation tailings by a combined method of high‒pressure leaching‒solvent extraction

Han B.

Journal of Hazardous Materials ( Journal of Hazardous Materials )  352   192 - 203   2018年06月

DOI

Investigation of copper and iron recovery from copper ore by high pressure leaching

Magwaneng R.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  23 ( 1 ) 80 - 83   2018年03月

<p>The products from the pressure oxidation leaching of a carbonaceous sulphide ore were compared under the range of reaction conditions for copper and iron recovery. Experiments were conducted under temperature ranges of 100-180°C at different sulfuric acid concentrations (0- 1.2 mol dm^-3). The aim of the study was to improve recovery of copper and iron, and discuss practical issues associated with competing process for leaching of carbonaceous sulphide ores. The ore contains chalcopyrite, bornite, dolomite, muscovite, quartz, mica and calcite. It is shown that at least 90% copper could be extracted using sulfuric acid in the high pressure leaching process. Observations employed by XRD analysis on solid residue indicated that iron precipitates form a number of different phases of hematite and jarosite depending on parameters studied.</p>

DOI

Magnetic separation and leaching study of rare earth elements from apatite-iron ore

Battsengel A.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  23 ( 1 ) 88 - 92   2018年03月

<p>Recovery of rare earth elements from apatite during phosphoric acid production based on nitric acid and sulphuric acid digestion is the most common treatment process for the industries. By the reaction of phosphate rock with sulphuric acid, the most of rare earth elements (REEs) are lost into the phosphogypsum and a remainder of the REEs in the sludge is dissolved partially by nitric acid solution. Whereas the REEphosphate minerals are dissolved about 50-60% in nitric acid at 70°C. Development of REEs leaching technique with high recovery is still essentialto reduce processing steps, energy consumption and emission of toxic gasses during the processing. The objective of this paper is to investigate the efficient condition for leaching of REEs from apatite-iron ore sample using magnetic separation and leaching with sulphuric acid solution. Ore sample contains major oxides as dominant 30.4 wt.% of calcium oxide (CaO), 28.0 wt.% of total iron oxides (TFexOy), 8.40 wt.% of silicon dioxide (SiO₂) and 10.96 wt.% of total rare earth oxides (TREO). Lanthanum, cerium, praseodymium and neodymium consist about 95% of the total rare earth elements (TREEs) in the ore. A wet high-intensity magnetic separator was used to remove iron bearing minerals. As results, 71% of iron was separated into the magnetic fraction from the iron rich apatite sample, while 92% of REEs were remained in the non-magnetic fraction. Then non-magnetic fraction was decomposed by dilute sulphuric acid solution. Analysis of leaching experiments indicated that more than 85% of REEs were dissolved into the leach solution.</p><p></p>

DOI

Mutual separation of palladium (II) and platinum (IV) from hydrochloric acid solutions usingm-phenylene diamine-containing agents

Matsumoto K.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  22 ( 1-2 ) 15 - 19   2018年03月

<p><i>m</i>-Phenylene diamine-containing compounds were synthesized via a one-pot process and subsequently used as new precipitating agents (<b>PA1</b> and <b>PA2</b>). The precipitation of Pd and Pt was studied using <b>PA1</b> and <b>PA2</b> as metal precipitants. While <b>PA1</b> exclusively precipitated Pd from a HCl solution containing Pd, Pt, and base metals, <b>PA2</b> achieved precipitation of both Pd and Pt from the metal-containing HCl solution. Mutual separation of Pd and Pt was achieved by using <b>PA1</b> and <b>PA2</b> in the first and second precipitation steps, respectively. Separation tests at varying agent loadings revealed that Pd and Pt were precipitated by forming of an ion-pair composed of a metal chloro-complex anion (i.e., [PdCl₄]^2－ or [PtCl₆]^2－) and one precipitating agent molecule (i.e., divalent cation). The stoichiometric ratio of the ion-pairs was in agreement with the atomic ratios estimated from X-ray photoelectron spectroscopy results. Since the precipitation mechanism herein was based on the formation of an ion-pair, the cations of the precipitating agents only recovered Pd and Pt chloro-complex anions when the cations of the base metals were present in the solution. The different hydrophobicities of the precipitating agents enabled mutual separation of Pd and Pt.</p>

DOI

Recovery of Precious and Base Metals from Waste Printed Circuit Boards Using a Sequential Leaching Procedure

Batnasan A.

JOM ( JOM )  70 ( 2 ) 124 - 128   2018年02月

DOI

Fining of alumina inclusion particles in steel

Inoue R.

ICS 2018 - 7th International Congress on Science and Technology of Steelmaking: The Challenge of Industry 4.0 ( ICS 2018 - 7th International Congress on Science and Technology of Steelmaking: The Challenge of Industry 4.0 )    2018年

Formation of hexavalent chromium in Cr-containing steelmaking slag

Sato Y.

Archives of Materials Science and Engineering ( Archives of Materials Science and Engineering )  94 ( 1 ) 5 - 10   2018年

DOI

Investigation for removal of organic carbon from carbonaceous copper sulphide ore and improving the recovery of copper through flotation

Magwaneng R.

Minerals, Metals and Materials Series ( Minerals, Metals and Materials Series )  Part F8   343 - 351   2018年

DOI

Nano bubble and emulsion size distribution measurement by interactive force apparatus

Fujita T.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  23 ( 2 ) 158 - 161   2018年

<p>Nano bubbles are prepared by using a pressurized pump or fine ceramics in water or oil. The prepared nano bubbles are stable for more than several days. Nano emulsion (w/o type) is prepared by mixing oil, water and surfactant with homogenizer and stable more than several months. The prepared bubble and emulsion size distribution in liquid is usually measured by dynamic light scattering method. However, it is difficult to measure the particle size for smaller refractive indexes between dispersed particle and solvent by the light scattering method and small amount of particle volume. Here, the dynamical method of interactive force measurement between dispersed nano bubble and emulsion under electric field has been used to measure any kind of small particle size distribution.</p>

DOI

Recovery of valuable metals from waste printed circuit boards by using iodine-iodide leaching and precipitation

Batnasan A.

Minerals, Metals and Materials Series ( Minerals, Metals and Materials Series )  Part F5   131 - 142   2018年

DOI

Selective Recovery of Palladium from PGM Containing Hydrochloric Acid Solution Using Thiocarbamoyl-substituted Adsorbents

Haga K.

International Journal of the Society of Material Engineering for Resources ( International Journal of the Society of Material Engineering for Resources )  23 ( 2 ) 173 - 177   2018年

<p>Two thiocarbamoyl compounds, monomer-type 4-<i>tert</i>-butyl(dimethylthiocarbamoyloxy) benzene (<b>1</b>) and dimer-type 1,1'-bis[(dimethylthiocarbamoyl)oxy]-2,2'-thiobis[4-<i>t</i>-butylbenzene] (<b>2</b>), were impregnated on ambertite XAD-7 resin for selective recovery of palladium from platinum group metals (PGM) containing a HCl solution. Pd(II)-ion adsorption performance of <b>1</b> and <b>2</b> impregnated resins were carried out in batch mode by varying HCl concentration, shaking time, Pd(II) concentration, and adsorbent amount. The monomer-impregnated adsorbent showed high Pd(II) sorption (94.1%) as compared with dimer-impregnated adsorbent (74.4%) in 1 M HCl media. Both monomer- and dimer-impregnated adsorbents exhibited a selective Pd(II) sorption from a mixed solution of PGM (Pd, Pt, and Rh). Pd(II)-ion desorption from Pd(II) adsorbed adsorbents were carried out using HCl-thiourea mixture as a desorption reagent. The results showed that both resins were suitable for selective separation of Pd(II) from PGM secondary resources.</p>

DOI

Volatilization of arsenic and antimony from tennantite/Tetrahedrite ore by a roasting process

Haga K.

Materials Transactions ( Materials Transactions )  59 ( 8 ) 1396 - 1403   2018年

<p>The volatilization of arsenic (As) and antimony (Sb) impurities in a copper ore consisting of tennantite (Cu₁₂As₄S₁₃)/tetrahedrite (Cu₁₂Sb₄S₁₃) by roasting in both nitrogen and air atmospheres was investigated in this study. The roasting experiments were performed at different temperatures ranging from 500 to 1200°C and different retention times from 15 to 60 minutes while the nitrogen and air flow to a furnace chamber was same as 300 ml/min.</p><p>The results showed that at 700°C, the maximum As volatilization in nitrogen and air atmospheres was reached over 90% and about 70%, respectively. Whereas the maximum Sb volatilization was about 90% at 1200°C in a nitrogen atmosphere and over 95% at 600°C in an air atmosphere. Meanwhile, copper and iron in the ore sample were not volatilized under the conditions. The contents of As, Sb and Cu in the residue obtained from roasting at 1200°C in a nitrogen atmosphere were 0.004 mass%, 0.75 mass% and 34.2 mass%, while their contents were 0.45 mass% As, 4.19 mass% Sb and 34.5 mass% Cu in the residue from roasting at 1000°C in an air atmosphere. Volatilization of arsenic from enargite, arsenic and antimony from tennantite/tetrahedrite sample containing chalcopyrite in a nitrogen atmosphere under the determined roasting condition were also discussed.</p><p>It suggests that As and Sb can be selectively separated from each other/other metals by volatilization. On the other hands, high grade copper concentrate with lower As and Sb contents can be made by volatilization in a nitrogen atmosphere.</p>

DOI

Applying Analysis of Mineral Surfaces to Predict Flotation Behavior

H. Matsuoka, R. Kawarabuki, K. Mitsuhashi, M. Kawata, C. Tokoro, K. Haga, A. Shibayama

Proceedings of XXIV International Mineral Processing Congress Proceedings ( IMPC2018)     330 - 337   2018年

Copper Recovery and Arsenic Removal from Enargite Ores and Concentrates during High Pressure Oxidative

A. Shibayama, A. Batnasan, K. Haga

Proceedings of XXIV International Mineral Processing Congress Proceedings (IMPC2018)     163 - 172   2018年

Copper Recovery from the Mine Tailings by Combination of Flotation with High-Pressure Oxidative Leaching and Solvent Extraction

A. Shibayama, B. Han, K. Haga, Z. Stevanović, R. Jonović, L. Avramović, R. Marković, D. Urosević, Y. Takasaki, N. Masuda, D. Ishiyama

Proceedings of the First Global Conference on Extractive Metallurgy (Extraction 2018)     1299 - 1307   2018年

Fining of Alumina Inclusion Particles in Steel

R. Inoue, Y. Takasaki, A. Shibayama

Proceedings of the 7th International Conference on Science and Technology of Steelmaking   ( ICS036 ) 1 - 8   2018年

Formation of Hexavalent Chromium in Cr-containing Steelmaking Slag

Y. Sato, K. Ijima, Y. Takasaki, A. Shibayama, R. Inoue

Proceedings of the Third International Conference on Advances in Metallurgical Processes and Materials     46 - 51   2018年

Investigation for Removal of Organic Carbon from Carbonaceous Copper Sulphide Ore and Improving the Recovery of Copper Through Flotation

R. Sandra Magwaneng, K. Haga, A. Batnasan, A. Shibayama, M. Kosugi, R. Kawarabuki, K. Mitsuhashi, M. Kawata

Proceedings of the Characterization of Minerals, Metals, and Materials 2018     343 - 351   2018年

Investigation of Copper and Iron Recovery from Copper Ore by High Pressure Leaching

R. Sandra Magwaneng, B. Altansukh, K. Haga, A. Shibayama, M. Kosugi, R. Kawarabuki, K. Mitsuhashi, M. Kawata

International Journal of the Society of Materials Engineering for Resources   23 ( 1 ) 80 - 83   2018年

Leaching of Gold from Waste Printed Circuit Boards in an Iodine-Iodide Solution and Regeneration of the Spent Lixiviant

A. Batnasan, K. Haga, A. Shibayama

Proceedings of XXIV International Mineral Processing Congress Proceedings (IMPC2018)     348 - 356   2018年

Magnetic Separation and Leaching Study of Rare Earth Elements from Apatite-Iron ore

A. Battsengel, B. Altansukh, K. Haga, Y. Watanabe, A. Shibayama

International Journal of the Society of Materials Engineering for Resources   23 ( 1 ) 88 - 92   2018年

Pressure Leaching of Carbonaceous Sulfide Concentrates for Recovery of Copper and Iron

R. S. Magwaneng, K. Haga, A. Batnasan, A. Shibayama, M. Kosugi, R. Kawarabuki, K. Mitsuhashi, M. Kawata

Proceedings of XXIV International Mineral Processing Congress Proceedings (IMPC2018)     545 - 553   2018年

Recovery of Rare Earth Elements and Phosphorus from Apatite Ore by Leaching and Precipitation

K. Haga, K. Amano, A. Battsengel, A. Batnasan, Y. Watanabe, A. Shibayama

Proceedings of XXIV International Mineral Processing Congress Proceedings (IMPC2018)     238 - 245   2018年

Recovery of Valuable Metals from Waste Printed Circuit Boards by Using Iodine-Iodide Leaching and Precipitation

A. Batnasan, K. Haga, A. Shibayama

Proceedings of the Rare Metal Technology 2018     131 - 142   2018年

Removal of Silica and Alumina as Impurities from Low-Grade Iron Ore Using Wet High-Intensity Magnetic Separation and Reverse Flotation

Kazutoshi Haga, Moses Charles Siame, Atsushi Shibayama

Journal of Minerals and Materials Characterization and Engineering ( Scientific Research Publishing, Inc. )  06 ( 03 ) 382 - 394   2018年

DOI

Selective Recovery of Palladium from PGM Containing Hydrochloric Acid Solution Using Thiocarbamoyl-Substituted Adsorbents

K. Haga, S. Sato, M. Rajiv Gandhi, M. Yamada, A. Shibayama

International Journal of the Society of Materials Engineering for Resources   23 ( 2 ) 173 - 177   2018年

Selective Separation of Light and Heavy Rare Earth Elements from the Pregnant Leach Solution of Apatite Ore with D2EHPA

Ariuntuya Battsengel, Altansukh Batnasan, Kazutoshi Haga, Atsushi Shibayama

Journal of Minerals and Materials Characterization and Engineering ( Scientific Research Publishing, Inc. )  06 ( 05 ) 517 - 530   2018年

DOI

Volatilization of Arsenic and Antimony from Tennantite/Tetrahedrite Ore by a Roasting Process

K. Haga, B. Altansukh, A. Shibayama

Materials Transactions   59 ( 8 ) 1396 - 1403   2018年

Synthesis of pincer-type extractants for selective extraction of palladium from PGMs: An improved liquid-liquid extraction approach to current refining processes

Rajiv Gandhi M.

Scientific Reports ( Scientific Reports )  7 ( 1 )   2017年12月

DOI

Leaching and Kinetic Study on Pressure Oxidation of Chalcopyrite in H<inf>2</inf>SO<inf>4</inf> Solution and the Effect of Pyrite on Chalcopyrite Leaching

Han B.

Journal of Sustainable Metallurgy ( Journal of Sustainable Metallurgy )  3 ( 3 ) 528 - 542   2017年09月

DOI

Calix[4]arene-Based n-Dialkylamino Extractants for Selective Platinum Group Metal Separation from Automotive Catalysts

Yamada M.

ChemistrySelect ( ChemistrySelect )  2 ( 3 ) 1052 - 1057   2017年

DOI

Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching

HAN Baisui, ALTANSUKH Batnasan, HAGA Kazutoshi, TAKASAKI Yasushi, SHIBAYAMA Atsushi

環境資源工学 ( 環境資源工学会 )  64 ( 1 ) 3 - 14   2017年

<p>In this paper, we present the results for recovery of copper from silicate-containing low-grade copper ore using flotation followed by atmospheric and high-pressure oxidative leaching. The effects of various flotation parameters, such as flotation time, PAX dosage, slurry pH and air injection rate on beneficiation of copper from the low-grade copper ore were studied. The recovery of copper reached 93.1% and the grade of copper improved to 18.2 mass% from 0.4 mass% under collector-less optimum flotation conditions. The enrichment ratio of copper in the concentrate was 45. The copper concentrate obtained from flotation of the low-grade copper ore was treated by atmospheric leaching and high-pressure oxidative leaching processes. A maximum recovery (>93.0%) of copper was obtained by high-pressure oxidative leaching in the water, whereas the copper recovery was lower than 12% in the sulfuric acid solution under atmospheric leaching conditions. The copper concentration in a pregnant leach solution enriched up to 15.0 g/L under the optimized leaching conditions. The effect of impurity such as iron in the sample on the froth flotation and both leaching processes is also considered. A process flow for the recovery of copper from silicate-containing low-grade copper ores is proposed as a result of these studies.</p>

DOI

Eco–friendly and Easily Prepared GrapheneNanosheets for Safe Drinking Water: Removal of Chlorophenoxyacetic Acid Herbicides

Kamaraj R.

ChemistrySelect ( ChemistrySelect )  2 ( 1 ) 342 - 355   2017年

DOI

Investigation for concentration and recovery of Tin from waste printed circuit boards by table separation.

Takeuchi M.

14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 ( 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 )    2017年

Platinum group metal separation by thiodiphenol-based n-dialkylamino extractants

Yamada M.

14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 ( 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 )    2017年

Pressure oxidative leaching of spent automobile catalysts: Leaching behavior of platinum group metals

Batnasan A.

14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 ( 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 )    2017年

Recovery of rare earth elements from leach liquor using organophosphorus acids

Battsengel A.

14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 ( 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 )    2017年

Recovery of tin from waste printed circuit board using physical and chemical separation

Harada S.

14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 ( 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 )    2017年

Recovery of tin-concentrated products and distribution behaviour of major elements from waste printed circuit board by combining physical separation

Harada S.

Proceedings - European Metallurgical Conference, EMC 2017 ( Proceedings - European Metallurgical Conference, EMC 2017 )  4   1834 - 1835   2017年

Selective separation of platinum group metal from automotive catalysts using p-dialkylaminomethylcalix[4]arenes

Gandhi M.R.

14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 ( 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 )    2017年

Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching

B. Han, B. Altansukh, K. Haga, Y. Takasaki, A. Shibayama

RESOURCES PROCESSING   64 ( 1 ) 3 - 14   2017年

Development of a Combined Flotation and High Pressure Leaching Process for Copper and Nickel Recovery from Mine Tailing

Refilwe Sandra Magwaneng, Altansukh Batnasan, Kazutoshi Haga, Atsushi Shibayama

Journal of Minerals and Materials Characterization and Engineering ( Scientific Research Publishing, Inc. )  05 ( 03 ) 118 - 131   2017年

DOI

Formation of Nano- and Micro- Gold Particles from Gold-Iodide Solution at pH 8-13

A. Batnasan, K. Haga, A. Shibayama

Proceedings of the Eighth International Conference on Materials Engineering for Resources 2017     236 - 239   2017年

Mutual Separation of Palladium (II) and Platinum (IV) from Hydrochloric Acid Solutions Using m-Phenylene Diamine-Containing Agents

K. Matsumoto, S. Yamakawa, T. Aoyagi, K. Haga, M. Jikei, A. Shibayama

International Journal of the Society of Materials Engineering for Resources   22 ( 1/2 ) 15 - 19   2017年

Recovery of tin-concentrated products and distribution behavior of major elements from waste printed circuit board by combining physical separation

S. Harada, M. Takeuchi, K. Haga, S. Kawamura, Y. Takasaki, A. Shibayama

Proceedings of European Metallurgical Conference (EMC2017)     1834 - 1835   2017年

Treatment of Low-Grade Iron Ore Using Two Stage Wet High-Intensity Magnetic Separation Technique

Moses C. Siame, K. Haga, A. Shibayama

Proceedings of the 19th International Conference on Chemical, Material, Metallurgical Engineering and Mine Engineering     617 - 622   2017年

白金族リサイクルのための抽出剤の開発

柴山 敦, 山田 学

金属   87   698 - 703   2017年

CiNii Research

白金族リサイクルのための抽出剤の開発

柴山 敦, 山田 学

「金属」　特集：貴金属・レアメタルのリサイクル技術や環境技術（依頼原稿）   87   698 - 703   2017年

CiNii Research

白金族リサイクルのための抽出剤の開発

柴山 敦, 山田 学

金属   87 ( 8 ) 698 - 703   2017年