首页|含铜砷的铜电解黑泥氧化酸浸-硫化沉淀分离和回收铜

含铜砷的铜电解黑泥氧化酸浸-硫化沉淀分离和回收铜

Separation and recovery of copper in Cu-As-bearing copper electrorefining black slime by oxidation acid leaching and sulfide precipitation

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开发从含铜砷的铜电解黑泥中分离和回收铜的湿法冶金新工艺.该工艺包括黑泥氧化酸浸和浸出液中选择性硫化沉铜两个步骤.研究各种工艺参数对铜和砷的浸出和沉淀的影响.在第一阶段中,最佳工艺条件为:初始H2SO4浓度为1.0 mol/L,液固比为10 mL/g,80℃下连续浸出4 h.此条件下铜浸出率可达95.2％,砷浸出率为97.6％.同时,通过Avrami模型成功模拟氧化酸浸过程铜和砷的浸出动力学,发现铜和砷浸出反应的表观活化能分别为33.6和35.1 kJ/mol,表明该浸出过程主要受化学反应和扩散混合控制.在选择性硫化沉淀过程中,最佳工艺条件为:硫与铜摩尔比2.4:1、时间1.5 h、温度25℃.此条件下99.4％的铜以CuS形式回收,而砷的沉淀率仅0.1％.
A new hydrometallurgical route for separation and recovery of Cu from Cu-As-bearing copper electro- refining black slime was developed. The proposed process comprised oxidation acid leaching of Cu-As-bearing slime and selective sulfide precipitation of Cu from the leachate. The effects of various process parameters on the leaching and precipitation of Cu and As were investigated. At the first stage, Cu extraction of 95.2％ and As extraction of 97.6％ were obtained at 80 ℃ after 4 h with initial H2SO4 concentration of 1.0 mol/L and liquid-to-solid ratio of 10 mL/g. In addition, the leaching kinetics of Cu and As was successfully reproduced by the Avrami model, and the apparent activation energies were found to be 33.6 and 35.1 kJ/mol for the Cu and As leaching reaction, respectively, suggesting a combination of chemical reaction and diffusion control. During the selective sulfide precipitation, about 99.4％ Cu was recovered as CuS, while only 0.1％ As was precipitated under the optimal conditions using sulfide-to-copper ratio of 2.4:1, time of 1.5 h and temperature of 25 ℃.

copper electrorefining black slimeoxidation acid leachingselective sulfide precipitationleaching kineticscopper recovery

史美清、闵小波、沈忱、柴立元、柯勇、颜旭、梁彦杰

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中南大学 冶金与环境学院,长沙 410083

中南大学 国家重金属污染防治工程技术研究中心,长沙 410083

铜电解黑泥 氧化酸浸 选择性硫化沉淀 浸出动力学 铜回收

authors are grateful for the financial supports from the National Natural Science Foundation of Chinaauthors are grateful for the financial supports from the National Natural Science Foundation of ChinaNational Science Fund for Distinguished Young Scholars of ChinaNational Key&nbsp,R&D Program of ChinaNational Key&nbsp,R&D Program of ChinaKey Research and Development Program of Hunan Province,China

5163401051904354518254032018YFC19003062019YFC19074052019SK2291

2021

10.1016/S1003-6326(21)65564-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(4)
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