摘要
采用加盐焙烧-酸浸法回收废脱硝催化剂中的钛,利用液-固多相反应的核收缩模型研究硫酸浸钛的浸出动力学,考察了硫酸浓度和酸浸温度对钛浸出反应速率的影响。结果表明,在温度低于60℃或硫酸质量分数小于45%时,浸出受化学反应和固膜扩散混合控制;升温和提高硫酸浓度浸出过程则转变为化学反应控制。低温受混合控制时的表观活化能为30.23 kJ/mol,升温后受化学反应控制时的表观活化能为92.92 kJ/mol,表观反应级数为4.932。提高反应温度和硫酸浓度均能加快钛的浸出速率,提高钛的浸出率。
Titanium from waste denitrification catalyst was recovered by salt roasting-acid leaching method. The leaching kinetics of titanium in sulfuric acid was studied by nuclear shrinkage model of liquid-solid multiphase reaction. The effects of sulfuric acid concentration and acid leaching temperature on the leaching rate of titanium were investigated. The results show that when the temperature is lower than 60 ℃ or the mass fraction of sulfuric acid is less than 45%, the leaching process is controlled by chemical reaction and solid film diffusion. The leaching process of heating up and increasing sulfuric acid concentration is controlled only by chemical reaction. The apparent activation energy is 30.23kJ/mol under mixed control at low temperature, and 92.92 kJ/mol under chemical control at high temperature, and the apparent reaction order is 4.932. Increasing the reaction temperature and sulfuric acid concentration can accelerate the leaching rate of titanium and improve the leaching rate of titanium.
作者
王路平
梅光军
吴敏
袁勤智
于明明
Wang Luping;Mei Guangjun;Wu Min;Yuan Qinzhi;Yu Mingming(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第3期9-13,共5页
Iron Steel Vanadium Titanium
基金
国家自然科学基金项目(编号:51904121)。
关键词
废脱硝催化剂
提钛
加盐焙烧-酸浸
浸出
动力学
spent denitrification catalyst
titanium recovery
salt roasting-acid leaching
leaching
kinetics
作者简介
王路平(1996—),男,江西抚州人,硕士研究生,主要从事废脱硝催化剂回收方面研究,E-mail:942505496@qq.com;通讯作者:梅光军(1969—),男,湖南常德人,教授,博士生导师,主要从事矿物加工工程方面的研究,Email:mgj8343@sina.com。
