Leaching of lead from zinc leach residue in acidic calcium chloride aqueous solution
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第5期
论文作者：Le Wang Wen-ning Mu Hong-tao Shen Shao-ming Liu Yu-chun Zhai
文章页码：460 - 466
摘 要：A process with potentially reduced environmental impacts and occupational hazards of lead-bearing zinc plant residue was studied to achieve a higher recovery of lead via a cost-effective and environmentally friendly process. This paper describes an optimization study on the leaching of lead from zinc leach residue using acidic calcium chloride aqueous solution. Six main process conditions, i.e., the solution p H value, stirring rate, concentration of Ca Cl2 aqueous solution, liquid-to-solid（L/S） ratio, leaching temperature, and leaching time, were investigated. The microstructure and components of the residue and tailing were characterized using scanning electron microscopy（SEM） and X-ray diffraction（XRD）. On the basis of experimental results, the optimum reaction conditions were determined to be a solution p H value of 1, a stirring rate of 500 r·min–1, a Ca Cl2 aqueous solution concentration of 400 g·L–1, a liquid-to-solid mass ratio of 7:1, a leaching temperature of 80°C, and a leaching time of 45 min. The leaching rate of lead under these conditions reached 93.79%, with an iron dissolution rate of 19.28%. Silica did not take part in the chemical reaction during the leaching process and was accumulated in the residue.
Le Wang1，Wen-ning Mu2，Hong-tao Shen2，Shao-ming Liu1，Yu-chun Zhai1
1. School of Materials and Metallurgy, Northeastern University2. School of Resources and Materials, Northeastern University at Qinghuangdao
摘 要：A process with potentially reduced environmental impacts and occupational hazards of lead-bearing zinc plant residue was studied to achieve a higher recovery of lead via a cost-effective and environmentally friendly process. This paper describes an optimization study on the leaching of lead from zinc leach residue using acidic calcium chloride aqueous solution. Six main process conditions, i.e., the solution p H value, stirring rate, concentration of Ca Cl2 aqueous solution, liquid-to-solid（L/S） ratio, leaching temperature, and leaching time, were investigated. The microstructure and components of the residue and tailing were characterized using scanning electron microscopy（SEM） and X-ray diffraction（XRD）. On the basis of experimental results, the optimum reaction conditions were determined to be a solution p H value of 1, a stirring rate of 500 r·min–1, a Ca Cl2 aqueous solution concentration of 400 g·L–1, a liquid-to-solid mass ratio of 7:1, a leaching temperature of 80°C, and a leaching time of 45 min. The leaching rate of lead under these conditions reached 93.79%, with an iron dissolution rate of 19.28%. Silica did not take part in the chemical reaction during the leaching process and was accumulated in the residue.
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