摘要
The substitution of traditional blast furnaces with steel-belt furnaces for antimony smelting was proposed.The influence of various parameters on the oxidative volatilization of stibnite was studied according to the production practice of steel-belt furnaces.Furthermore,the kinetics of oxidative volatilization was elucidated using differential thermal gravimetric analyses and non-isothermal analysis methods.The results indicated that the oxygen concentration and the temperature were pivotal variables in the oxidative volatilization process.Notably,the volatilization efficiency of antimony was 97.25%under optimal conditions.Moreover,the kinetic control stages were divided into chemical reaction control(440-490°C),internal diffusion control(500-550°C),and chemical reaction control(560-580°C).These stages corresponded to activation energies of 16.40-18.79,120.86-195.96,and 24.00-28.31 kJ/mol,respectively.
采用钢带炉取代传统锑冶炼鼓风炉。根据钢带焙烧炉实际工况研究不同因素对辉锑矿氧化挥发焙烧的影响。此外,通过差热−热重实验和非等温分析法研究氧化挥发动力学。结果表明,氧气浓度和温度是氧化挥发的关键参数。在优化条件下锑的挥发率为97.25%。动力学控制步骤可分为三个阶段:化学反应控制(440~490℃)、内扩散控制(500~550℃)和化学反应控制(560~580℃),对应的活化能分别为16.40~18.79 kJ/mol、120.86~195.96 kJ/mol和24.00~28.31 kJ/mol。
基金
supported financially by the National Natural Science Foundation of China(No.52074362)。
作者简介
Corresponding author:Chao-bo TANG,Tel:+86-13875802550,E-mail:204165@csu.edu.cn。
