The Experts below are selected from a list of 4752 Experts worldwide ranked by ideXlab platform
Xiangping Chen - One of the best experts on this subject based on the ideXlab platform.
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separation and recovery of metal values from leaching liquor of mixed type of spent lithium ion batteries
Separation and Purification Technology, 2015Co-Authors: Xiangping Chen, Depei Liu, Hang Hu, Tao Zhou, Bao Xu, Shaoyun FanAbstract:Present study was focused on a Hydrometallurgical Process for the separation and recovery of copper, manganese, cobalt, nickel and lithium from leaching liquor of spent lithium-ion batteries. First, copper ions were selectively extracted using Mextral®5640H as extraction reagent after the removal of impurity ions. Manganese ions were then selectively separated and precipitated using KMnO4 solution and about 99.2% manganese was removed and precipitated as MnO2 and Mn2O3. Subsequently, nickel loaded Mextral®272P was used as a new extraction reagent to separate and recover cobalt from the leaching liquor. Finally, nickel and lithium ions left in the leachate were successively precipitated using NaOH and Na3PO3 solutions. Nickel and lithium were recovered as Ni(OH)2 and Li3PO4 after filtration and drying. Recovery efficiencies could be attained as follows: 100% for copper; 99.2% for manganese, 97.8% for cobalt, 99.1% for nickel and 95.8% for lithium under their optimized experimental conditions. McCabe–Thiele extraction isotherm study was conducted for the extraction of copper and cobalt to predict the extraction stages required. It is expected that this Hydrometallurgical Process can be a candidate for the effective separation and comprehensive recovery of all metals from the leaching liquor.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Yongbin Chen, Tao Zhou, Hang HuAbstract:Abstract Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe–Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC 2 O 4 ⋅2H 2 O and Li 2 CO 3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium-ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Depei Liu, Yongbin Chen, Hang Hu, Tao Zhou, Shaoyun FanAbstract:Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe-Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC2O4{dot operator}2H2O and Li2CO3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
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Hydrometallurgical Process for the recovery of metal values from spent lithium ion batteries in citric acid media
Waste Management & Research, 2014Co-Authors: Xiangping Chen, Tao ZhouAbstract:In this paper, a Hydrometallurgical Process has been proposed to recover valuable metals from spent lithium-ion batteries in citric acid media. Leaching efficiencies as high as 97%, 95%, 94%, and 99% of Ni, Co, Mn, and Li were achieved under the optimal leaching experimental conditions of citric acid concentration of 2 mol L−1, leaching temperature of 80 °C, leaching time of 90 min, liquid–solid ratio of 30 ml g−1, and 2 vol. % H2O2. For the metals recovery Process, nickel and cobalt were selectively precipitated by dimethylglyoxime reagent and ammonium oxalate sequentially. Then manganese was extracted by Na-D2EHPA and the manganese-loaded D2EHPA was stripped with sulfuric acid. The manganese was recovered as MnSO4 in aqueous phase and D2EHPA could be reused after saponification. Finally, lithium was precipitated by 0.5 mol L−1 sodium phosphate. Under their optimal conditions, the recovery percentages of Ni, Co, Mn, and Li can reach 98%, 97%, 98%, and 89%, respectively. This is a relatively simple route ...
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recovery of ti and li from spent lithium titanate cathodes by a Hydrometallurgical Process
Hydrometallurgy, 2014Co-Authors: Wenjiang Tang, Xiangping Chen, Yongbin Chen, Tao Zhou, Hao Duan, Jian WangAbstract:Abstract Despite the potential application of lithium titanate (Li 4 Ti 5 O 12 ) battery, recovering Ti and Li from the spent batteries remains a largely unexplored but important topic. In this contribution, a Process including leaching, extraction for the separation of titanium from leaching liquor and synthesizing TiO 2 nano-particles by a homogeneous precipitation method is presented as a successful strategy. Various operating parameters were optimized, affording more than 97% leaching efficiency of both Ti and Li at a sulfuric acid solution of 4 M, H 2 O 2 of 20 vol.%, solid-to-liquid ratio of 0.025 g mL − 1 , leaching temperature of 80 °C and leaching time of 4 h. In the case of the extraction, the solvent extraction efficiency of titanium about 99% can be achieved with 30 vol.% primary amine N1923 as an extractant and kerosene as a diluent at highly acidic condition, organic phase/aqueous phase (O/A) ratio 2:1 within 10 min of contact time in ambient temperature, while the solvent extraction efficiency of lithium is only 1.4%. The raffinate was concentrated from 0.74 g L − 1 to 1.11 g L − 1 by evaporation, then lithium carbonate was precipitated by adding saturated solution of sodium carbonate affording 85% recovery. Finally, the stripping was fast with equilibrium time of 10 min with 2 M H 2 SO 4 and titanium stripping of 98%. The results of XRD and SEM show that the size of as-prepared TiO 2 powders is 100–200 nm from the stripped solution by the homogeneous precipitation method.
Hang Hu - One of the best experts on this subject based on the ideXlab platform.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Yongbin Chen, Tao Zhou, Hang HuAbstract:Abstract Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe–Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC 2 O 4 ⋅2H 2 O and Li 2 CO 3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
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separation and recovery of metal values from leaching liquor of mixed type of spent lithium ion batteries
Separation and Purification Technology, 2015Co-Authors: Xiangping Chen, Depei Liu, Hang Hu, Tao Zhou, Bao Xu, Shaoyun FanAbstract:Present study was focused on a Hydrometallurgical Process for the separation and recovery of copper, manganese, cobalt, nickel and lithium from leaching liquor of spent lithium-ion batteries. First, copper ions were selectively extracted using Mextral®5640H as extraction reagent after the removal of impurity ions. Manganese ions were then selectively separated and precipitated using KMnO4 solution and about 99.2% manganese was removed and precipitated as MnO2 and Mn2O3. Subsequently, nickel loaded Mextral®272P was used as a new extraction reagent to separate and recover cobalt from the leaching liquor. Finally, nickel and lithium ions left in the leachate were successively precipitated using NaOH and Na3PO3 solutions. Nickel and lithium were recovered as Ni(OH)2 and Li3PO4 after filtration and drying. Recovery efficiencies could be attained as follows: 100% for copper; 99.2% for manganese, 97.8% for cobalt, 99.1% for nickel and 95.8% for lithium under their optimized experimental conditions. McCabe–Thiele extraction isotherm study was conducted for the extraction of copper and cobalt to predict the extraction stages required. It is expected that this Hydrometallurgical Process can be a candidate for the effective separation and comprehensive recovery of all metals from the leaching liquor.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium-ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Depei Liu, Yongbin Chen, Hang Hu, Tao Zhou, Shaoyun FanAbstract:Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe-Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC2O4{dot operator}2H2O and Li2CO3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
Shaoyun Fan - One of the best experts on this subject based on the ideXlab platform.
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separation and recovery of metal values from leaching liquor of mixed type of spent lithium ion batteries
Separation and Purification Technology, 2015Co-Authors: Xiangping Chen, Depei Liu, Hang Hu, Tao Zhou, Bao Xu, Shaoyun FanAbstract:Present study was focused on a Hydrometallurgical Process for the separation and recovery of copper, manganese, cobalt, nickel and lithium from leaching liquor of spent lithium-ion batteries. First, copper ions were selectively extracted using Mextral®5640H as extraction reagent after the removal of impurity ions. Manganese ions were then selectively separated and precipitated using KMnO4 solution and about 99.2% manganese was removed and precipitated as MnO2 and Mn2O3. Subsequently, nickel loaded Mextral®272P was used as a new extraction reagent to separate and recover cobalt from the leaching liquor. Finally, nickel and lithium ions left in the leachate were successively precipitated using NaOH and Na3PO3 solutions. Nickel and lithium were recovered as Ni(OH)2 and Li3PO4 after filtration and drying. Recovery efficiencies could be attained as follows: 100% for copper; 99.2% for manganese, 97.8% for cobalt, 99.1% for nickel and 95.8% for lithium under their optimized experimental conditions. McCabe–Thiele extraction isotherm study was conducted for the extraction of copper and cobalt to predict the extraction stages required. It is expected that this Hydrometallurgical Process can be a candidate for the effective separation and comprehensive recovery of all metals from the leaching liquor.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium-ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Depei Liu, Yongbin Chen, Hang Hu, Tao Zhou, Shaoyun FanAbstract:Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe-Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC2O4{dot operator}2H2O and Li2CO3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
Tao Zhou - One of the best experts on this subject based on the ideXlab platform.
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separation and recovery of metal values from leaching liquor of mixed type of spent lithium ion batteries
Separation and Purification Technology, 2015Co-Authors: Xiangping Chen, Depei Liu, Hang Hu, Tao Zhou, Bao Xu, Shaoyun FanAbstract:Present study was focused on a Hydrometallurgical Process for the separation and recovery of copper, manganese, cobalt, nickel and lithium from leaching liquor of spent lithium-ion batteries. First, copper ions were selectively extracted using Mextral®5640H as extraction reagent after the removal of impurity ions. Manganese ions were then selectively separated and precipitated using KMnO4 solution and about 99.2% manganese was removed and precipitated as MnO2 and Mn2O3. Subsequently, nickel loaded Mextral®272P was used as a new extraction reagent to separate and recover cobalt from the leaching liquor. Finally, nickel and lithium ions left in the leachate were successively precipitated using NaOH and Na3PO3 solutions. Nickel and lithium were recovered as Ni(OH)2 and Li3PO4 after filtration and drying. Recovery efficiencies could be attained as follows: 100% for copper; 99.2% for manganese, 97.8% for cobalt, 99.1% for nickel and 95.8% for lithium under their optimized experimental conditions. McCabe–Thiele extraction isotherm study was conducted for the extraction of copper and cobalt to predict the extraction stages required. It is expected that this Hydrometallurgical Process can be a candidate for the effective separation and comprehensive recovery of all metals from the leaching liquor.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Yongbin Chen, Tao Zhou, Hang HuAbstract:Abstract Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe–Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC 2 O 4 ⋅2H 2 O and Li 2 CO 3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
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Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium-ion batteries
Waste Management, 2015Co-Authors: Xiangping Chen, Depei Liu, Yongbin Chen, Hang Hu, Tao Zhou, Shaoyun FanAbstract:Environmentally hazardous substances contained in spent Li-ion batteries, such as heavy metals and nocuous organics, will pose a threat to the environment and human health. On the other hand, the sustainable recycling of spent lithium-ion batteries may bring about environmental and economic benefits. In this study, a Hydrometallurgical Process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent. Recycled dimethylglyoxime could be re-used as precipitant for nickel and revealed similar precipitation performance compared with fresh dimethylglyoxime. Then the separation of manganese and cobalt was conducted by solvent extraction method using cobalt loaded D2EHPA. And McCabe-Thiele isotherm was employed for the prediction of the degree of separation and the number of extraction stages needed at specific experimental conditions. Finally, cobalt and lithium were sequentially precipitated and recovered as CoC2O4{dot operator}2H2O and Li2CO3 using ammonium oxalate solution and saturated sodium carbonate solution, respectively. Recovery efficiencies could be attained as follows: 98.7% for Ni; 97.1% for Mn, 98.2% for Co and 81.0% for Li under optimized experimental conditions. This Hydrometallurgical Process may promise a candidate for the effective separation and recovery of metal values from the sulfuric acid leaching liquor.
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Hydrometallurgical Process for the recovery of metal values from spent lithium ion batteries in citric acid media
Waste Management & Research, 2014Co-Authors: Xiangping Chen, Tao ZhouAbstract:In this paper, a Hydrometallurgical Process has been proposed to recover valuable metals from spent lithium-ion batteries in citric acid media. Leaching efficiencies as high as 97%, 95%, 94%, and 99% of Ni, Co, Mn, and Li were achieved under the optimal leaching experimental conditions of citric acid concentration of 2 mol L−1, leaching temperature of 80 °C, leaching time of 90 min, liquid–solid ratio of 30 ml g−1, and 2 vol. % H2O2. For the metals recovery Process, nickel and cobalt were selectively precipitated by dimethylglyoxime reagent and ammonium oxalate sequentially. Then manganese was extracted by Na-D2EHPA and the manganese-loaded D2EHPA was stripped with sulfuric acid. The manganese was recovered as MnSO4 in aqueous phase and D2EHPA could be reused after saponification. Finally, lithium was precipitated by 0.5 mol L−1 sodium phosphate. Under their optimal conditions, the recovery percentages of Ni, Co, Mn, and Li can reach 98%, 97%, 98%, and 89%, respectively. This is a relatively simple route ...
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recovery of ti and li from spent lithium titanate cathodes by a Hydrometallurgical Process
Hydrometallurgy, 2014Co-Authors: Wenjiang Tang, Xiangping Chen, Yongbin Chen, Tao Zhou, Hao Duan, Jian WangAbstract:Abstract Despite the potential application of lithium titanate (Li 4 Ti 5 O 12 ) battery, recovering Ti and Li from the spent batteries remains a largely unexplored but important topic. In this contribution, a Process including leaching, extraction for the separation of titanium from leaching liquor and synthesizing TiO 2 nano-particles by a homogeneous precipitation method is presented as a successful strategy. Various operating parameters were optimized, affording more than 97% leaching efficiency of both Ti and Li at a sulfuric acid solution of 4 M, H 2 O 2 of 20 vol.%, solid-to-liquid ratio of 0.025 g mL − 1 , leaching temperature of 80 °C and leaching time of 4 h. In the case of the extraction, the solvent extraction efficiency of titanium about 99% can be achieved with 30 vol.% primary amine N1923 as an extractant and kerosene as a diluent at highly acidic condition, organic phase/aqueous phase (O/A) ratio 2:1 within 10 min of contact time in ambient temperature, while the solvent extraction efficiency of lithium is only 1.4%. The raffinate was concentrated from 0.74 g L − 1 to 1.11 g L − 1 by evaporation, then lithium carbonate was precipitated by adding saturated solution of sodium carbonate affording 85% recovery. Finally, the stripping was fast with equilibrium time of 10 min with 2 M H 2 SO 4 and titanium stripping of 98%. The results of XRD and SEM show that the size of as-prepared TiO 2 powders is 100–200 nm from the stripped solution by the homogeneous precipitation method.
Katsutoshi Inoue - One of the best experts on this subject based on the ideXlab platform.
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Hydrometallurgical Process for recovery of metal values from spent nickel metal hydride secondary batteries
Hydrometallurgy, 1998Co-Authors: Pingwei Zhang, Toshiro Yokoyama, Osamu Itabashi, Toshishige M Suzuki, Yoshito Wakui, Katsutoshi InoueAbstract:Abstract A completely Hydrometallurgical Process has been developed for the recovery of metal values such as cobalt, nickel and rare earths from spent nickel-metal hydride (Ni-MH) secondary batteries. Effects of hydrochloric acid concentration, temperature, reaction time and solid-to-liquid ratio on leaching of metals contained in the electrode materials of the batteries were studied. The optimal operating conditions were found to be 3 M HCl at a temperature of 95°C and a 3-h leach time, and it was possible to treat up to 5.5 g of scrap in 50 ml of acid solution where the recoveries 100% of cobalt, over 96% of nickel and 99% of rare earths were achieved. A typical chemical composition of the resulting leach liquor was approximately, in grams per liter, 23.4 Ni, 1.7 Co, 3.4 Fe, 0.72 Zn, 0.46 Al, 1.2 Mn, 4.2 La, 0.26 Ce, 0.82 Pr, 2.6 Nd and 0.074 Sm, as well as 50 Cl. The pH of the solution was around 1.2. The rare earth values can be readily recovered from the leach liquor by the use of a solvent extraction circuit with 25% bis(2-ethylhexyl) phosphoric acid (D2EHPA) in kerosene, in which a two-stage counter-current extraction at an O:A ratio of 3:1 at an equilibrium pH of 2.0, a single-stage cobalt scrubbing with 0.3 M hydrochloric acid at an O:A ratio of 22:1, and a stripping operation with 2.0 M hydrochloric acid in one contact at an O:A ratio of 5:1 are involved. A mixed rare earth oxide of over 99% purity was obtained by selective precipitation with oxalic acid, and calcination of the precipitate. The total yield of rare earths approached 98%. The cobalt and nickel in the raffinate are effectively separated by selective extraction of cobalt with 25% TOA in kerosene after concentration (up to [Cl−]≈220 g l−1). Nearly complete recovery of cobalt can be achieved by using a three-stage counter-current extraction at an O:A ratio of 2:1, followed by stripping with a dilute hydrochloric acid solution (pH 2.0) in a single stage at an O:A ratio of 4:1. Subsequently the cobalt in the strip liquor and the nickel remained in the raffinate are separately recovered as oxalates by the addition of ammonium oxalate. A pure cobalt product and a nickel oxalate with a purity close to 99.9% were obtained. The total recoveries of cobalt and nickel were found to be approx. 98% and 96%, respectively.
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Hydrometallurgical Process for recovery of metal values from spent lithium ion secondary batteries
Hydrometallurgy, 1998Co-Authors: Pingwei Zhang, Toshiro Yokoyama, Osamu Itabashi, Toshishige M Suzuki, Katsutoshi InoueAbstract:We report studies on the separation and recovery of metal values such as cobalt and lithium from spent lithium-ion secondary batteries. Effects of leachant concentration, temperature, reaction time and solid-to-liquid ratio on leaching of cobalt and lithium contained in the anode material of the batteries were examined using several reagents such as sulfurous acid, hydroxylamine hydrochloride and hydrochloric acid as leachants. Hydrochloric acid was found to be the most suitable leachant among the three reagents. A leaching efficiency of more than 99% of cobalt and lithium could be achieved when 4 M HCl solution was used at a temperature of 80°C and a reaction time of 1 h. The pH of the final pregnant liquor obtained was around 0.6 and the concentrations of cobalt and lithium were approximately 17 and 1.7 (g l−1), respectively. The cobalt in the leach liquor was extracted selectively and nearly completely with 0.90 M PC-88A in kerosene at equilibrium pH ≈ 6.7 in a single stage at an O:A ratio of 0.85:1. Then the cobalt in the loaded organic phase was recovered as cobalt sulfate with high purity (LiCo < 5 × 10−5) after lithium scrubbing with a dilute hydrochloric acid solution containing 30 g l−1 of cobalt at an O:A phase ratio of 10:1. This was followed by stripping with a 2 M H2SO4 solution at an O:A ratio of 5:1. The raffinate was concentrated and the lithium remaining in the aqueous solution was readily recovered as lithium carbonate precipitate by the addition of a saturated sodium carbonate solution at close to 100°C. The content of cobalt in the lithium precipitate was found to be less than 0.07%. Lithium recovery approached 80%. A flowsheet of the Hydrometallurgical Process for the recovery of cobalt and lithium from the spent lithium-ion secondary batteries has been established based on the experimental results.
