Ion Exchange of Copper from Sulphate Effluent using DOWEX G-26
Journal of the Korean Institute of Resources Recycling, 2008
본 연구는 전자산업으로부터 발생하는 CMP 폐수와 유사한 $0.3{\sim}0.5mg/ml$ 구리를 함유한 조제 황산 용액으로부터 DOWEX G-26 양이온 교환 수지를 사용... more 본 연구는 전자산업으로부터 발생하는 CMP 폐수와 유사한 $0.3{\sim}0.5mg/ml$ 구리를 함유한 조제 황산 용액으로부터 DOWEX G-26 양이온 교환 수지를 사용한 구리 회수 공정 개발에 관한 것이다. 함구리 황산 용액으로부터 구리를 회수하기 위해 용액의 pH, 수지의 사용량, 용액의 산 농도, 용액과 수지의 접촉시간 등을 변수로 다양한 조건에서의 회수 실험을 실시하였다. 평형 pH 2.5, 용액/수지의 비 100mL/g 조건에서 14분의 접촉으로 99.99%의 구리가 흡착되었다. 구리의 흡착은 Langmuir isotherm을 따랐으며, 반응치수는 2차였다. 흡착된 구리는 묽은 황산에 의해 수지로부터 효과적으로 용리되었으며, 이로부터 농축용액을 만들 수 있었다. 【In view of the increasing importance of the waste recycling to meet the strict environmental regulations, the present investigation reports an adsorption process using cationic exchanger DOWEX G-26 for the recovery of copper from the synthetic sulphate solutions containing copper 0.3 to 0.5 mg/ml, similar to the CMP waste effluent of electronic industry. Various process parameters viz. contact time, solution pH, resin dose, and A/R ratio for elution were investigated to recover copper from the effluents. Complete adsorption of copper from the solution was achieved at equilibrium pH 2.5 and aqueous I resin ...
The authors evaluated the degree of liberation of printed circuit boards ground by impact milling... more The authors evaluated the degree of liberation of printed circuit boards ground by impact milling to recover valuable materials. Wastes of two board types were ground with a swing-hammer-type impact mill. Heavy medium separation using tetrabromoethane was employed to separate the ground materials into the sink product, containing mainly copper, and the float product, consisting mainly of epoxy resin and glass fiber. The degree of liberation was evaluated with heavy medium separation. The sink product was larger than the float product. When processing boards whose surfaces are fully plated with copper foil we attained a degree of liberation for copper in the sink of up to 95%, which was higher than the degree of printed circuit board liberation. By contrast, the copper content of the float product was quite low at less than 1%. Thus, non-copper materials are easily liberated, and non-copper materials with few impurities can be obtained from printed circuit board wastes.
Effect of Slag Compositions on the Extraction of Metallic Components from the Used PCB
Materials Science Forum, 2006
From materials view point, a PCB (Printed Circuit Board) is a simple mixture of various metals, p... more From materials view point, a PCB (Printed Circuit Board) is a simple mixture of various metals, plastics and oxides. Thus, it can be regarded as urbanized resources or ores. The existence of valuable metallic components in used PCB, then, becomes a major driving force for the recycling In this study, the effect of slag compositions on the extraction of valuable metallic components from the used PCB is investigated. Especially, a melting temperature of slag and slag viscosity are discussed as major operating parameters. PCB contains nearly 30wt% of SiO2 and 20wt% of Al2O3 as major oxides, and by just adding other flux components to used PCB, 20wt%Al2O3-Xwt%SiO2 - Ywt%CaO-10wt%MgO slag system with low melting point and low slag viscosity can be made to extract metallic components from used PCB by gravity separation. The slag basicity was changed under fixed compositions of Al2O3 and MgO. It was found that a proper melting temperature and slag basicity to make a homogeneous liquid slag and to extract metallic components from used PCB were 1573 K, and 0.75, respectively.
Mineral Processing and Extractive Metallurgy Review, 2013
ABSTRACT Present study was undertaken to develop an economically feasible and environmental frien... more ABSTRACT Present study was undertaken to develop an economically feasible and environmental friendly technique to recover metals (Ni, Cu, Co, Zn, Mg) from mine tailing by employing Penicillium chrysogenum strain KBS3. Potential of Penicillium chrysogenum in generating a variety of organic acids and effect of different organic wastes as substrates was evaluated. Maximum solubilization of Nickel (55%), Copper (67%), Magnesium (69%), Cobalt (60%) and Zinc (65%) was achieved in the media containing glucose, tea leaves, molasses and waste winery grapes as substrates.
International Journal of Refractory Metals and Hard Materials, 1992
Laboratory and pilot-plant investigations have been carried out for the preparation of ultrapure ... more Laboratory and pilot-plant investigations have been carried out for the preparation of ultrapure tungsten. The starting material was commercially available ammonium paratungstate. Uranium-and thorium-free tungsten powder was prepared in the laboratory using solvent extraction with D2EHPA and TOPO. Optimum conditions of the purification were established. Based on the results of the laboratory work, a pilot plant of 2.4 tons per year capacity was constructed and operated to produce tungsten powder of 99"99% purity. From this powder, tungsten rods of 99"999% purity were prepared by electron-beam floating-zone melting.
Electrolyte purification in energy-saving monovalent copper electrowinning processes
Hydrometallurgy, 2007
A suitable method has been proposed to purify a copper electrolyte within the framework of an ene... more A suitable method has been proposed to purify a copper electrolyte within the framework of an energy-saving cuprous electrowinning process. In this method, the impurities are selectively removed from the electrolyte that contains a large amount of cuprous ion in an ammoniacal alkaline solution at pH 9–11. Among these impurities, precious metals such as silver are removed by cementation with
Journal of the Korean Institute of Resources Recycling, 2015
Cyanidation has been used worldwide to recover gold from primary ore or concentrate. The use of c... more Cyanidation has been used worldwide to recover gold from primary ore or concentrate. The use of cyanide is however becoming an emerging issue because of the toxic residue and wastewater made from the process. The cyanide-containing wastewater should be treated properly, obeying the environmental standard and regulations. In the present article, the domestic and international uses, regulations, and treatment technologies of cyanide in gold mining were investigated as a feasibility study to develop a cyanide treatment process as well as the cyanidation process. A biological cyanide treatment process to develop a zeroemission gold recovery and wastewater treatment process was also briefly introduced.
Recently, the amount of Waste Electrical and Electronic Equipment (WEEE) in Korea has greatly bee... more Recently, the amount of Waste Electrical and Electronic Equipment (WEEE) in Korea has greatly been increasing, as well as that from manufacturing sites. At an early stage, the driving force for the recycling of WEEE was the reclamation of precious metals such as gold, silver, plat-inum and palladium. However, the profitability of recycl-ing diminishes as the amount of noble metals contained in each individual piece of equipment decreases, thus requir-ing more efficient recycling technology. Moreover, WEEE has been accompanied by environmental problems. In 2003, the Korean government introduced the Extended Producer Responsibility (EPR) Program for personal computers and white-goods appliances such as TVs, washers, refrigerators and air conditioners. The program is scheduled to extend to cellular phones and audio equipment from 2005. However, the lack of recycling technology is expected to inhibit the success of the program. Realizing this, Korea Insti-tute of Geoscience & Mineral Re...
In order to reduce the surface roughness of a copper deposit from cuprous ions in ammoniacal alka... more In order to reduce the surface roughness of a copper deposit from cuprous ions in ammoniacal alkaline solutions, optimization of the electrolytic conditions was attempted, and the surface roughness was somewhat improved. Because the improvement was insufficient, the addition of gelatin or polyethylene glycol (PEG) to the electrolyte was then examined. It was revealed that both additives effectively Highlights Copper electrodeposition from ammoniacal alkaline solutions was investigated. The copper deposit became rough in the absence of additives with no agitation. Gelatin and polyethylene glycol reduced the surface roughness of the copper deposit. Polyethylene glycol tended to cause nodule formation.
Hydrometallurgical process for the recycling of copper using anodic oxidation of cuprous ammine complexes and flow-through electrolysis
Electrochimica Acta, 2008
ABSTRACT Flow-through electrolysis for copper electrowinning from cuprous ammine complex was stud... more ABSTRACT Flow-through electrolysis for copper electrowinning from cuprous ammine complex was studied in order to develop a hydrometallurgical copper recycling process using an ammoniacal chloride solution, focusing on the anodic oxidation of cuprous to cupric ammine complexes. The current efficiency of this anodic oxidation was 96% at a current density of 200Am−2 under a batch condition. In a flow-through electrolysis using a sub-liter cell and a carbon felt anode, the anodic current efficiency increased with the flow rate and was typically higher than 97%. This tendency was explained by the backward flow of the cupric ammine complex, which was formed on the anode, through the diaphragm. The anodic overpotential was lower than 0.3V even at an apparent current density of 1500Am−2. A similar current efficiency and overpotential were also achieved in a liter scale cell, which indicates the scale flexibility of this electrolysis. The power consumption requirements for copper electrowinning in this cell were 460 and 770kWht−1 at the current densities of 250 and 500Am−2, respectively, which were much lower than that of the conventional copper electrowinning despite the longer interpolar distance.
In order to develop an energy-saving copper recycling process from wastes, electrochemical measur... more In order to develop an energy-saving copper recycling process from wastes, electrochemical measurements were conducted in ammoniacal alkaline solutions containing Cu(I) ions and an ammonium salt of sulfate, chloride or nitrate. The results of each system were then compared. The polarization measurements suggested that the voltage required for the electrode process is lower in the chloride and nitrate systems than that in the sulfate system. The cathode current efficiency during the copper electrodeposition varied from 39 to 97% and increased with current density in the chloride and sulfate systems. In the nitrate system, the lowest cathode current efficiency of 30% was observed because of nitrate ion reduction. Based on these results, the power consumption required for the electrowinning stage of the copper recycling process was calculated. Among these three systems, the chloride system showed the lowest power consumption of 500 kWh t −1 at the current density of 200 A m −2 , which is about 25% of the conventional copper electrowinning process from a copper sulfate-sulfuric acid solution.
In order to make the energy-saving copper recycling process more economical by reducing the power... more In order to make the energy-saving copper recycling process more economical by reducing the power consumption during copper electrowinning, the influence of the bath composition on the saturated concentration of cuprous ion, the electric conductivity, the cathodic current efficiency and the power consumption were studied in an ammonia-ammonium chloride-cuprous/cupric ion solution. The saturated cuprous ion concentration increased with the ammonia and ammonium chloride concentrations. The electric conductivity of the solution increased in proportion to the ammonium chloride concentration, because ammonium chloride acts as a supporting electrolyte. When the ammonia concentration increased from 3 to 10 kmolÁm À3 or when the cuprous ion concentration increased from 0.5 to 2 kmolÁm À3 , the cathodic current efficiency decreased by 5-10% at a current density higher than 500 AÁm À2. This results from an increase in the cupric ion concentration formed by the unavoidable oxidation and the disproportionation of cuprous ions. The low current efficiency, however, had little influence on the power consumption compared to the influence of the electric conductivity that was the dominant factor determining the power consumption. Actually, when the concentration of ammonium chloride increased from 2 to 4 kmolÁm À3 , because of its function of increasing the electric conductivity of the solution, the power consumption was reduced by half. Based on this study, a suitable bath composition for the energy-saving copper recycling process was determined to be 3-10 kmolÁm À3 ammonia, 4-5 kmolÁm À3 ammonium chloride and 1-2 kmolÁm À3 cuprous ions.
Extraction of the Surface-Coated Metals from Waste Acrylonitrile Butadiene Styrene Plastics in an Ammoniacal Solution
The Minerals, Metals & Materials Series, 2018
Leaching of the surface-coated metals from waste acrylonitrile butadiene styrene plastics (WABSP)... more Leaching of the surface-coated metals from waste acrylonitrile butadiene styrene plastics (WABSP) has been investigated in the ammoniacal solution. The ammoniacal leaching of WABSP (typically containing 4.1 wt% Cu, 1.3 wt% Ni, 0.03 wt% Cr) efficiently dissolved copper and nickel, leaving unleached chromium as fine particles. The results indicate that the anions of different buffer media for metals leaching follow the order: CO32− > Cl− > SO42−. A declined leaching with high NH4OH–(NH4)2CO3 ratio (8:1) and a steep rise in extraction with high pulp in solution revealed the influence of anion (CO32−) and cation (Cu2+) present in the system. The leaching performed in carbonate solution by maintaining 5.0 M total NH3 concentration as NH4OH–(NH4)2CO3 ratio, 4:1; pulp density, 200 g/L; agitation speed, 400 rpm; temperature, 20 °C and time, 120 min yielded the maximum extraction (>99%) of copper and nickel. The study reveals a plausible recovery of the surface-coated metals from the WABSP without altering the properties of polymer material that can be recycled separately.
Resources Recycling, Korea University of Science and Technology (UST), Daejeon, 34113, Republic o... more Resources Recycling, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 34132, Republic of Korea Research & Product Development, TAE-HYUNG Recycling, Gimcheon-si, Gyeongsangbuk-do 39066, Republic of Korea
Ion Exchange of Copper from Sulphate Effluent using DOWEX G-26
Journal of the Korean Institute of Resources Recycling, 2008
본 연구는 전자산업으로부터 발생하는 CMP 폐수와 유사한 $0.3{\sim}0.5mg/ml$ 구리를 함유한 조제 황산 용액으로부터 DOWEX G-26 양이온 교환 수지를 사용... more 본 연구는 전자산업으로부터 발생하는 CMP 폐수와 유사한 $0.3{\sim}0.5mg/ml$ 구리를 함유한 조제 황산 용액으로부터 DOWEX G-26 양이온 교환 수지를 사용한 구리 회수 공정 개발에 관한 것이다. 함구리 황산 용액으로부터 구리를 회수하기 위해 용액의 pH, 수지의 사용량, 용액의 산 농도, 용액과 수지의 접촉시간 등을 변수로 다양한 조건에서의 회수 실험을 실시하였다. 평형 pH 2.5, 용액/수지의 비 100mL/g 조건에서 14분의 접촉으로 99.99%의 구리가 흡착되었다. 구리의 흡착은 Langmuir isotherm을 따랐으며, 반응치수는 2차였다. 흡착된 구리는 묽은 황산에 의해 수지로부터 효과적으로 용리되었으며, 이로부터 농축용액을 만들 수 있었다. 【In view of the increasing importance of the waste recycling to meet the strict environmental regulations, the present investigation reports an adsorption process using cationic exchanger DOWEX G-26 for the recovery of copper from the synthetic sulphate solutions containing copper 0.3 to 0.5 mg/ml, similar to the CMP waste effluent of electronic industry. Various process parameters viz. contact time, solution pH, resin dose, and A/R ratio for elution were investigated to recover copper from the effluents. Complete adsorption of copper from the solution was achieved at equilibrium pH 2.5 and aqueous I resin ...
The authors evaluated the degree of liberation of printed circuit boards ground by impact milling... more The authors evaluated the degree of liberation of printed circuit boards ground by impact milling to recover valuable materials. Wastes of two board types were ground with a swing-hammer-type impact mill. Heavy medium separation using tetrabromoethane was employed to separate the ground materials into the sink product, containing mainly copper, and the float product, consisting mainly of epoxy resin and glass fiber. The degree of liberation was evaluated with heavy medium separation. The sink product was larger than the float product. When processing boards whose surfaces are fully plated with copper foil we attained a degree of liberation for copper in the sink of up to 95%, which was higher than the degree of printed circuit board liberation. By contrast, the copper content of the float product was quite low at less than 1%. Thus, non-copper materials are easily liberated, and non-copper materials with few impurities can be obtained from printed circuit board wastes.
Effect of Slag Compositions on the Extraction of Metallic Components from the Used PCB
Materials Science Forum, 2006
From materials view point, a PCB (Printed Circuit Board) is a simple mixture of various metals, p... more From materials view point, a PCB (Printed Circuit Board) is a simple mixture of various metals, plastics and oxides. Thus, it can be regarded as urbanized resources or ores. The existence of valuable metallic components in used PCB, then, becomes a major driving force for the recycling In this study, the effect of slag compositions on the extraction of valuable metallic components from the used PCB is investigated. Especially, a melting temperature of slag and slag viscosity are discussed as major operating parameters. PCB contains nearly 30wt% of SiO2 and 20wt% of Al2O3 as major oxides, and by just adding other flux components to used PCB, 20wt%Al2O3-Xwt%SiO2 - Ywt%CaO-10wt%MgO slag system with low melting point and low slag viscosity can be made to extract metallic components from used PCB by gravity separation. The slag basicity was changed under fixed compositions of Al2O3 and MgO. It was found that a proper melting temperature and slag basicity to make a homogeneous liquid slag and to extract metallic components from used PCB were 1573 K, and 0.75, respectively.
Mineral Processing and Extractive Metallurgy Review, 2013
ABSTRACT Present study was undertaken to develop an economically feasible and environmental frien... more ABSTRACT Present study was undertaken to develop an economically feasible and environmental friendly technique to recover metals (Ni, Cu, Co, Zn, Mg) from mine tailing by employing Penicillium chrysogenum strain KBS3. Potential of Penicillium chrysogenum in generating a variety of organic acids and effect of different organic wastes as substrates was evaluated. Maximum solubilization of Nickel (55%), Copper (67%), Magnesium (69%), Cobalt (60%) and Zinc (65%) was achieved in the media containing glucose, tea leaves, molasses and waste winery grapes as substrates.
International Journal of Refractory Metals and Hard Materials, 1992
Laboratory and pilot-plant investigations have been carried out for the preparation of ultrapure ... more Laboratory and pilot-plant investigations have been carried out for the preparation of ultrapure tungsten. The starting material was commercially available ammonium paratungstate. Uranium-and thorium-free tungsten powder was prepared in the laboratory using solvent extraction with D2EHPA and TOPO. Optimum conditions of the purification were established. Based on the results of the laboratory work, a pilot plant of 2.4 tons per year capacity was constructed and operated to produce tungsten powder of 99"99% purity. From this powder, tungsten rods of 99"999% purity were prepared by electron-beam floating-zone melting.
Electrolyte purification in energy-saving monovalent copper electrowinning processes
Hydrometallurgy, 2007
A suitable method has been proposed to purify a copper electrolyte within the framework of an ene... more A suitable method has been proposed to purify a copper electrolyte within the framework of an energy-saving cuprous electrowinning process. In this method, the impurities are selectively removed from the electrolyte that contains a large amount of cuprous ion in an ammoniacal alkaline solution at pH 9–11. Among these impurities, precious metals such as silver are removed by cementation with
Journal of the Korean Institute of Resources Recycling, 2015
Cyanidation has been used worldwide to recover gold from primary ore or concentrate. The use of c... more Cyanidation has been used worldwide to recover gold from primary ore or concentrate. The use of cyanide is however becoming an emerging issue because of the toxic residue and wastewater made from the process. The cyanide-containing wastewater should be treated properly, obeying the environmental standard and regulations. In the present article, the domestic and international uses, regulations, and treatment technologies of cyanide in gold mining were investigated as a feasibility study to develop a cyanide treatment process as well as the cyanidation process. A biological cyanide treatment process to develop a zeroemission gold recovery and wastewater treatment process was also briefly introduced.
Recently, the amount of Waste Electrical and Electronic Equipment (WEEE) in Korea has greatly bee... more Recently, the amount of Waste Electrical and Electronic Equipment (WEEE) in Korea has greatly been increasing, as well as that from manufacturing sites. At an early stage, the driving force for the recycling of WEEE was the reclamation of precious metals such as gold, silver, plat-inum and palladium. However, the profitability of recycl-ing diminishes as the amount of noble metals contained in each individual piece of equipment decreases, thus requir-ing more efficient recycling technology. Moreover, WEEE has been accompanied by environmental problems. In 2003, the Korean government introduced the Extended Producer Responsibility (EPR) Program for personal computers and white-goods appliances such as TVs, washers, refrigerators and air conditioners. The program is scheduled to extend to cellular phones and audio equipment from 2005. However, the lack of recycling technology is expected to inhibit the success of the program. Realizing this, Korea Insti-tute of Geoscience & Mineral Re...
In order to reduce the surface roughness of a copper deposit from cuprous ions in ammoniacal alka... more In order to reduce the surface roughness of a copper deposit from cuprous ions in ammoniacal alkaline solutions, optimization of the electrolytic conditions was attempted, and the surface roughness was somewhat improved. Because the improvement was insufficient, the addition of gelatin or polyethylene glycol (PEG) to the electrolyte was then examined. It was revealed that both additives effectively Highlights Copper electrodeposition from ammoniacal alkaline solutions was investigated. The copper deposit became rough in the absence of additives with no agitation. Gelatin and polyethylene glycol reduced the surface roughness of the copper deposit. Polyethylene glycol tended to cause nodule formation.
Hydrometallurgical process for the recycling of copper using anodic oxidation of cuprous ammine complexes and flow-through electrolysis
Electrochimica Acta, 2008
ABSTRACT Flow-through electrolysis for copper electrowinning from cuprous ammine complex was stud... more ABSTRACT Flow-through electrolysis for copper electrowinning from cuprous ammine complex was studied in order to develop a hydrometallurgical copper recycling process using an ammoniacal chloride solution, focusing on the anodic oxidation of cuprous to cupric ammine complexes. The current efficiency of this anodic oxidation was 96% at a current density of 200Am−2 under a batch condition. In a flow-through electrolysis using a sub-liter cell and a carbon felt anode, the anodic current efficiency increased with the flow rate and was typically higher than 97%. This tendency was explained by the backward flow of the cupric ammine complex, which was formed on the anode, through the diaphragm. The anodic overpotential was lower than 0.3V even at an apparent current density of 1500Am−2. A similar current efficiency and overpotential were also achieved in a liter scale cell, which indicates the scale flexibility of this electrolysis. The power consumption requirements for copper electrowinning in this cell were 460 and 770kWht−1 at the current densities of 250 and 500Am−2, respectively, which were much lower than that of the conventional copper electrowinning despite the longer interpolar distance.
In order to develop an energy-saving copper recycling process from wastes, electrochemical measur... more In order to develop an energy-saving copper recycling process from wastes, electrochemical measurements were conducted in ammoniacal alkaline solutions containing Cu(I) ions and an ammonium salt of sulfate, chloride or nitrate. The results of each system were then compared. The polarization measurements suggested that the voltage required for the electrode process is lower in the chloride and nitrate systems than that in the sulfate system. The cathode current efficiency during the copper electrodeposition varied from 39 to 97% and increased with current density in the chloride and sulfate systems. In the nitrate system, the lowest cathode current efficiency of 30% was observed because of nitrate ion reduction. Based on these results, the power consumption required for the electrowinning stage of the copper recycling process was calculated. Among these three systems, the chloride system showed the lowest power consumption of 500 kWh t −1 at the current density of 200 A m −2 , which is about 25% of the conventional copper electrowinning process from a copper sulfate-sulfuric acid solution.
In order to make the energy-saving copper recycling process more economical by reducing the power... more In order to make the energy-saving copper recycling process more economical by reducing the power consumption during copper electrowinning, the influence of the bath composition on the saturated concentration of cuprous ion, the electric conductivity, the cathodic current efficiency and the power consumption were studied in an ammonia-ammonium chloride-cuprous/cupric ion solution. The saturated cuprous ion concentration increased with the ammonia and ammonium chloride concentrations. The electric conductivity of the solution increased in proportion to the ammonium chloride concentration, because ammonium chloride acts as a supporting electrolyte. When the ammonia concentration increased from 3 to 10 kmolÁm À3 or when the cuprous ion concentration increased from 0.5 to 2 kmolÁm À3 , the cathodic current efficiency decreased by 5-10% at a current density higher than 500 AÁm À2. This results from an increase in the cupric ion concentration formed by the unavoidable oxidation and the disproportionation of cuprous ions. The low current efficiency, however, had little influence on the power consumption compared to the influence of the electric conductivity that was the dominant factor determining the power consumption. Actually, when the concentration of ammonium chloride increased from 2 to 4 kmolÁm À3 , because of its function of increasing the electric conductivity of the solution, the power consumption was reduced by half. Based on this study, a suitable bath composition for the energy-saving copper recycling process was determined to be 3-10 kmolÁm À3 ammonia, 4-5 kmolÁm À3 ammonium chloride and 1-2 kmolÁm À3 cuprous ions.
Extraction of the Surface-Coated Metals from Waste Acrylonitrile Butadiene Styrene Plastics in an Ammoniacal Solution
The Minerals, Metals & Materials Series, 2018
Leaching of the surface-coated metals from waste acrylonitrile butadiene styrene plastics (WABSP)... more Leaching of the surface-coated metals from waste acrylonitrile butadiene styrene plastics (WABSP) has been investigated in the ammoniacal solution. The ammoniacal leaching of WABSP (typically containing 4.1 wt% Cu, 1.3 wt% Ni, 0.03 wt% Cr) efficiently dissolved copper and nickel, leaving unleached chromium as fine particles. The results indicate that the anions of different buffer media for metals leaching follow the order: CO32− > Cl− > SO42−. A declined leaching with high NH4OH–(NH4)2CO3 ratio (8:1) and a steep rise in extraction with high pulp in solution revealed the influence of anion (CO32−) and cation (Cu2+) present in the system. The leaching performed in carbonate solution by maintaining 5.0 M total NH3 concentration as NH4OH–(NH4)2CO3 ratio, 4:1; pulp density, 200 g/L; agitation speed, 400 rpm; temperature, 20 °C and time, 120 min yielded the maximum extraction (>99%) of copper and nickel. The study reveals a plausible recovery of the surface-coated metals from the WABSP without altering the properties of polymer material that can be recycled separately.
Resources Recycling, Korea University of Science and Technology (UST), Daejeon, 34113, Republic o... more Resources Recycling, Korea University of Science and Technology (UST), Daejeon, 34113, Republic of Korea Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 34132, Republic of Korea Research & Product Development, TAE-HYUNG Recycling, Gimcheon-si, Gyeongsangbuk-do 39066, Republic of Korea
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