无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2015, Vol. 47 ›› Issue (1): 26-.

• 论文 • 上一篇    下一篇

硫酸亚铁还原硫酸浸取软锰矿动力学研究

崔益顺1,2 ,向云刚1   

  1. 1.四川理工学院材料与化学工程学院,四川自贡 643000;2. 企业信息化与物联网测控技术四川省高校重点实验室
  • 出版日期:2015-01-10 发布日期:2015-01-14

Study on sulfuric acid leaching kinetics of pyrolusite with ferrous sulfate as reducing agent

Cui Yishun1,2,Xiang Yungang1   

  1. 1.College of Material and Chemical Engineering,Sichuan University of Sciences & Engineering,Zigong 643000,China;
    2.Key Laboratory of Higher Education of Sichuan Province for Enterprise Informationalization and Internet of Things
  • Online:2015-01-10 Published:2015-01-14

摘要: 以硫酸亚铁作为还原剂,研究硫酸浸取软锰矿过程的动力学。考察了搅拌速率、浸出温度、硫酸初始浓度、硫酸亚铁初始浓度、矿粉初始粒度对锰浸出率的影响。结果表明:锰浸出速率随搅拌速率的增大、浸出温度的升高、硫酸浓度的增大、硫酸亚铁浓度的增大、矿粉初始粒径的减小而增大,其中矿粉粒度对锰浸出率的影响最大,硫酸浓度次之,硫酸亚铁浓度影响较小。硫酸亚铁作为还原剂,在硫酸环境下浸出软锰矿的过程受内扩散控制,浸出过程的宏观动力学方程为:1-2/3x-(1-x)2/3=1.95(1/d02)c■c■exp[-29 680/(RT)]t,其表观活化能为29.68 kJ/mol。

关键词: 软锰矿, 硫酸亚铁, 硫酸, 浸取动力学, 锰浸出率

Abstract: The leaching kinetics of pyrolusite by sulfuric acid with ferrous sulfate as reducing agent was studied.The effects of stirring intensify,leaching temperature,initial concentration of sulfuric acid,initial concentration of ferrous sulfate,and initial particle size of mineral powder on the leaching rate of manganese were investigated.The results showed that the leaching rate of manganese was increased with the increase of the stirring speed,leaching temperature,sulfuric acid concentration,ferrous sulfate concentration and the decrease of diameter of pyrolusite.The influence order was particle size of mineral powder, concentration of sulfuric acid,and concentration of ferrous sulfate.The pyrolusite leaching process was controlled by the diffusion through the solid film.The macroscopic kinetic equation of the leaching process was:1-2/3x-(1-x)2/3= 1.95(1/d02)c■c■exp[-29 680/(RT)]t,and the apparent activation energy was 29.68 kJ/mol.

Key words: pyrolusite, ferrous sulfate, sulfuric acid, leaching kinetics, manganese leaching rate

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