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锌冶炼中浸渣锌还原浸出机制与动力学

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成果类型:
期刊论文
作者:
张纯;闵小波;张建强;王密;李辕成
通讯作者:
Min, Xiao-Bo(mxbcsu@163.com)
作者机构:
[王密; 张建强; 闵小波; 张纯; 李辕成] School of Metallurgy and Environment, Central South University, Changsha, China
[闵小波] Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Central South University, Changsha, China
[张纯] School of Municipal and Mapping Engineering, Hunan City University, Yiyang, China
通讯机构:
School of Metallurgy and Environment, Central South University, Changsha, China
语种:
中文
关键词:
中浸渣;还原浸出;二氧化硫;动力学
关键词(英文):
Kinetics;Reductive leaching;Sulfur dioxide;Zinc neutral leaching residue
期刊:
中国有色金属学报
ISSN:
1004-0609
年:
2016
卷:
26
期:
1
页码:
197-203
基金类别:
湖南省科技重大专项(2012FJ1010) 国家自然科学基金资助项目(51474247) 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)~~
机构署名:
本校为其他机构
院系归属:
市政与测绘工程学院
摘要:
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SO_2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;SO_2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...
摘要(英文):
The chemical composition and zinc phases were studied by XRD, XPS, ICP and phase analysis. The effects of temperature, initial sulfuric acid concentration and partial pressure of sulfur dioxide on the Zn leaching rate were also studied when sulfur dioxide was used as reductant. The mechanism and kinetics of reductive decomposition of zinc ferrite were also studied. The results show that H+plays a key role during the reductive leaching process. The activity energy is 31.67 kJ/mol and the kinetic equation is established based on the chemical reaction controlled model. The optimum technological c...

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