辽宁某钒钛磁铁矿酸浸提钒浸出动力学研究

辽宁某钒钛磁铁矿精矿在初始硫酸浓度为2.5 mol/L、氢氟酸浓度为2.5 mol/L、浸出温度为90℃、液固比为5、浸出时间为2 h、搅拌速率控制在100~200 r/min的条件下,钒的浸出率高达95.68%。试验主要考查了温度与浸出动力学的关系,主要研究内容包括:温度对钒浸出率的影响,通过试验数据处理及拟合分析求出整个浸出反应的表观活化能E=45.20 kJ/mol和反应速率动力学方程1-(1-μ)^(1/3)=26.31 e^(-45200/RT),明确钒浸出过程中反应速率的控制步骤。最终建立了钒的浸出体系动力学模型,为直接酸浸提钒奠定了理论基础。

Study on leaching dynamics for extracting vanadium from the vanadium-titanium magnetite concentrate in Liaoning province

The experiment on thevanadium-titanium bearing magnetite concentrate from Liaoning province was carried out for leaching vanadium at extracting rate of 95.68%under the conditions as follows:with initial H 2SO 4 concentration of 2.5 mol/L,HF concentration of 2.5 mol/L,leaching temperature of 90℃,liquid-solid ratio of 5,leaching time of 2 h and agitation speed of 100-200 rpm.In this paper,the relationship between temperatures and leaching dynamics was investigated.The apparent activation energy E=45.20 kJ/mol and the dynamics equation 1-(1-μ)^1/3=26.31 e^-45200/RT were obtained by data processing and fitting of the experimental results.The procedure for control the reaction velocity in vanadium leaching process wasdefined.Eventually,the kinetic model of vanadium leaching system was established,which provides theoretical basis for direct extraction of vanadium using acidic leaching process.