锌冶炼中浸渣锌还原浸出机制与动力学

中国有色金属学报, 2016, 26(1): 197-203.

锌冶炼中浸渣锌还原浸出机制与动力学

张纯 ^1, , 闵小波 ^2, , 张建强 ^3, , 王密 ^4, , 李辕成 ^5,

1.中南大学冶金与环境学院,长沙410083;湖南城市学院市政与测绘工程学院,益阳413000

2.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

3.中南大学冶金与环境学院,长沙,410083

4.中南大学冶金与环境学院,长沙,410083

5.中南大学冶金与环境学院,长沙,410083

基金项目: 国家自然科学基金资助项目(51474247) Project(13B009)supported by the Outstanding Youth Project of Hunan Provincial Department of Education,China Project(2015-40)supported by the Science and Technology Project of Yiyang,China Project(51474247)supported by the Authors Gratefully Acknowledge the Natural Science Foundation of China 湖南省科技重大专项(2012FJ1010) 益阳市科技计划项目(益科字[2015]40号) 湖南省教育厅优秀青年项目(13B009)Project(2012FJ1010,2014FJ1011)supported the Key Projects of Science and Technology of Hunan Province,China

关键词：中浸渣 , 还原浸出 , 二氧化硫 , 动力学

Mechanisms and kinetics on reductive leaching of zinc from zinc neutral leaching residue

Keywords： zinc neutral leaching residue , reductive leaching , sulfur dioxide , kinetics

以锌冶炼中浸渣为研究对象,研究中浸渣的化学成分及锌的存在形态,锌主要以铁酸锌形式存在.采用SO2做还原剂,研究温度、初始硫酸浓度、二氧化硫分压对锌浸出效率的影响,并分析中浸渣中锌还原浸出反应机制及动力学.结果表明:H+在锌还原浸出过程中起关键作用,锌还原浸出反应活化能为31.67 kJ/mol,为化学反应控制;SO2做还原剂时,反应时间、液固比及初始酸度均大幅降低.反应最佳工艺条件:初始硫酸浓度80 g/L、温度95℃、液固比(L/S) 10 mL/g、二氧化硫分压200 kPa、反应时间120 min.该工艺条件下,中浸渣中锌浸出率达99％以上.XRD和ICP分析表明:中浸渣中铁酸锌分解,硫化锌在该反应条件下未完全浸出,还原浸出渣中主要化学成分为铅和锌,主要物相为PbSO4和ZnS.

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