| Recovery of valuable metals from waste diamond cutters through ammonia-ammonium sulfate leaching |
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| 作者姓名： | Ping Xue Guang-qiang Li Yong-xiang Yang Qin-wei Qin Ming-xing Wei |
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| 作者单位： | Key Laboratory for Ferrous Metallurgy and Resource Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China |
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| 基金项目： | This work was financially supported by Disciplines Group Project of Jianghan University's Thirteenth Five-year Plan for Vehicle Material Development and Testing，the Wuhan Science and Technology Bureau，the Scientific and Technological Research Project of Hubei Provincial Department of Educa-tion |
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| 摘 要： | Copper and zinc were recovered from waste diamond cutters through leaching with an ammonia-ammonium sulfate system and air as an oxidant. The effects of experimental parameters on the leaching process were investigated, and the potential-pH (E-pH) diagrams of Cu-NH3-SO42--H2O and Zn-NH3-SO42--H2O at 25℃ were drawn. Results showed that the optimal parameters for the leaching reaction are as follows:reaction temperature, 45℃; leaching duration, 3 h; liquid-to-solid ratio, 50:1 (mL/g); stirring speed, 200 r/min; ammonia concentration, 4.0 mol/L; ammonium sulfate concentration, 1.0 mol/L; and air flow rate, 0.2 L/min. The results of the kinetics study indicated that the leaching is controlled by the surface chemical reaction at temperatures below 35℃, and the leaching is controlled by diffusion through the product layer at temperatures above 35℃.
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| 关 键 词： | recovery waste diamond cutters renewable resources ammonia-ammonium sulfate leaching kinetics |
Recovery of valuable metals from waste diamond cutters through ammonia–ammonium sulfate leaching |
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| Ping Xue,Guang-qiang Li,Yong-xiang Yang,Qin-wei Qin,Ming-xing Wei.Recovery of valuable metals from waste diamond cutters through ammonia-ammonium sulfate leaching[J].International Journal of Minerals,Metallurgy and Materials,2017,24(12):1352-1360. |
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| Authors: | Ping Xue Guang-qiang Li Yong-xiang Yang Qin-wei Qin Ming-xing Wei |
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| Institution: | 1. Key Laboratory for Ferrous Metalurgy and Resource Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;School of Electromechanical and Architectural Engineering, Jianghan University, Wuhan 430056, China;2. Key Laboratory for Ferrous Metalurgy and Resource Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;3. Key Laboratory for Ferrous Metalurgy and Resource Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;Department of Materials Science and Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands;4. School of Electromechanical and Architectural Engineering, Jianghan University, Wuhan 430056, China |
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| Abstract: | Copper and zinc were recovered from waste diamond cutters through leaching with an ammonia-ammonium sulfate system and air as an oxidant. The effects of experimental parameters on the leaching process were investigated, and the potential-pH(E-pH) diagrams of Cu-NH3-24SO--H2O and Zn-NH3-24SO--H2O at 25°C were drawn. Results showed that the optimal parameters for the leaching reaction are as follows: reaction temperature, 45°C; leaching duration, 3 h; liquid-to-solid ratio, 50:1 (mL/g); stirring speed, 200 r/min; ammonia concentration, 4.0 mol/L; ammonium sulfate concentration, 1.0 mol/L; and air flow rate, 0.2 L/min. The results of the kinetics study indicated that the leaching is controlled by the surface chemical reaction at temperatures below 35°C, and the leaching is controlled by diffusion through the product layer at temperatures above 35°C. |
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| Keywords: | recovery waste diamond cutters renewable resources ammonia-ammonium sulfate leaching kinetics |
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