摘要
针对APT生产过程中,钨酸铵溶液中镁含量过高,蒸发结晶后仲钨酸铵产品中镁含量超标的问题,采用间歇反应器法考察了反应温度、搅拌速度、初始溶液Mg2+浓度以及树脂粒径对724型弱酸性阳离子树脂吸附钨酸铵溶液中镁的影响,明晰了树脂吸附除镁的动力学。试验结果表明:Mg^2+交换过程符合双驱动力模型(ln(1-η^2)=kt),镁在树脂颗粒内的扩散为吸附过程的控制步骤,吸附反应的表观活化能为15.69 kJ/mol,表观反应级数为1.31,经拟合后得到反应的总动力学方程。通过此动力学的研究,可对724型阳离子树脂从钨酸铵溶液中吸附除镁提供理论指导。
In response to the problem that the magnesium content in ammonium tungstate solution is too high in the APT production process,and the magnesium content in secondary ammonium tungstate products after evaporative crystallization,the intermittent reactor method was used to investigate the reaction temperature,stirring speed,the initial Mg2+concentration of the solution and the effect of resin particle size on the adsorption of 724-type weakly acidic cationic resin to adsorb magnesium in ammonium tungstate solution.The experimental results showed that the Mg^2+exchange process conformed to the dual-drive model(ln(1-η^2)=kt),the diffusion of Mg in the resin particles was the control step of the adsorption process,the apparent activation energy of the adsorption reaction was 15.69 kJ/mol and the apparent reaction level was 1.31,and the total kinetic equation of the reaction was obtained after fitting.The kinetic study could provide theoretical guidance for the adsorption of magnesium by 724 cation resin from ammonium tungstate solution.
作者
张永会
杨亮
ZHANG Yonghui;YANG Liang(Ganzhou JXTC SUMMIT AT&M New MaterialsCo.,Ltd.,Ganzhou 341000,Jiangxi,China;Faculty of Materials Matallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《中国钨业》
CAS
2019年第5期36-41,共6页
China Tungsten Industry
基金
国家自然科学基金地区基金项目(51964019)。
