Leaching and selective zinc recovery from acidic leachates of zinc metallurgical leach residues
Leaching and selective zinc recovery from acidic leachates of zinc metallurgical leach residues
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DOI：
10.1016/j.jhazmat.2016.01.028
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发表时间：
2017-02-15
影响因子：
13.6
通讯作者：
van Hullebusch, Eric D.
中科院分区：
文献类型：
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作者：
Sethurajan, Manivannan;Huguenot, David;van Hullebusch, Eric D.
研究了3种不同时期（ZLR 1>30年、ZLR 2 5-30年和ZLR 3 < 2年）锌浸出渣的锌浸出率和动力学。对影响锌浸出率的固液比、温度、酸浓度、搅拌等因素进行了优化。在最佳条件下，ZLR 1、ZLR 2和ZLR 3的锌浸出率分别为46.2（± 4.3）、23.3（± 2.7）和17.6（± 1.2）mg/g。锌浸出动力学符合收缩核扩散模型。根据Arrhenius方程估算出ZLR 1、ZLR 2和ZLR 3浸出Zn所需的活化能分别为2.24、6.63和11.7 kcal/mol。对于ZLR 1、ZLR 2和ZLR 3，相对于硫酸浓度的反应级数也被确定为分别为0.20、0.56和0.87。通过调节初始pH值以及通过加入氢氧化钠和硫化钠，从浸出液中选择性地回收Zn。通过化学硫化物沉淀法，从ZLR多金属浸出液中选择性地回收了90%以上的锌。(C)© 2016 Elsevier B. V.版权所有。
Zinc (Zn) leaching yields and kinetics from three different zinc plant leach residues (ZLR) generated in different periods (ZLR1 >30 years, ZLR2 5-30 years and ZLR3 < 2 years) were investigated. The factors affecting the Zn leaching rate such as solid to liquid ratio, temperature, acid concentration and agitation were optimized. Under optimum conditions, 46.2 (+/- 4.3), 23.3 (+/- 2.7) and 17.6 (+/- 1.2) mg of Zn can be extracted per gram of ZLR1, ZLR2 and ZLR3, respectively. The Zn leaching kinetics of ZLRs follow the shrinking core diffusion model. The activation energy required to leach Zn from ZLR1, ZLR2 and ZLR3 were estimated to be 2.24 kcal/mol, 6.63 kcal/mol and 11.7 kcal/mol, respectively, by the Arrhenius equation. The order of the reaction with respect to the sulfuric acid concentration was also determined as 0.20, 0.56, and 0.87 for ZLR1, ZLR2 and ZLR3, respectively. Zn was selectively recovered from the leachates by adjusting the initial pH and by the addition of sodium hydroxide and sodium sulfide. More than 90% of Zn was selectively recovered as sphalerite from the ZLR polymetallic leachates by chemical sulfide precipitation. (C) 2016 Elsevier B.V. All rights reserved.