Experimental Study on Leaching of Valuable Metals from Purification Residue of Zinc Hydrometallurgy
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摘要:
研究了用柠檬酸从湿法炼锌净化渣中回收有价金属的工艺方法。采用单因素浸出试验，探讨了净化渣中有价金属浸出的行为规律。分别考察了柠檬酸浓度、浸出温度、液固比、搅拌速度、pH值和浸出时间对有价金属浸出率的影响。结果表明：在柠檬酸浓度0.8 mol/L、浸出温度60℃、液固比10：1、搅拌速度200 r/min、pH 1.0、浸出时间90 min条件下，锌、镍、铜的浸出率分别为79.60%、75.09%、9.70%，钴的浸出率高达97.64%。本研究为湿法炼锌净化渣的综合回收利用提供了一种新的途径。
Abstract:The process of recovering valuable metals of purification residue from zinc hydrometallurgy with citric acid was studied. The leaching behavior of valuable metals from purification residue was analyzed by single factor test. The effects of citric acid concentration, leaching temperature, ratio of liquid to solid, stirring speed, pH value and leaching time on the leaching rate of valuable metals were investigated. The results showed that the leaching rates of zinc, nickel and copper were 79.60%, 75.09% and 9.70%, respectively, and that of cobalt was as high as 97.64%, under the conditions of citric acid concentration 0.8 mol/L, leaching temperature 60 ℃, ratio of liquid to solid 10:1, stirring speed 200 r/min, pH1.0 and leaching time 90 min. This research provides a new way for comprehensive recovery and utilization of purification residue from zinc hydrometallurgy.
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Key words:
- zinc hydrometallurgy /
- purification residue /
- citric acid /
- valuable metals /
- leaching
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表 1 湿法炼锌净化渣主要化学成分
Table 1. Main chemical components of purification residue from zinc hydrometallurgy
/% 元素 Co Ni Cu Zn Fe Al 含量 5.98 1.40 0.82 11.04 1.77 0.058 
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表 2 优化条件下的综合试验结果
Table 2. Comprehensive experimental results under optimized conditions
序号 浸出率/% Co Ni Cu Zn 1 98.34 71.77 7.60 76.94 2 98.52 77.16 9.81 80.77 3 96.07 76.34 11.68 81.09 平均值 97.64 75.09 9.70 79.60
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