钛精矿酸解固相物中钛的浸出行为及动力学研究

Research on leaching behavior and kinetics of titanium from solid phase of acidolysis of titanium concentrate

为了提高钛精矿酸解固相物中钛的浸出率,研究了钛精矿酸解固相物中钛浸出动力学并进行了工业应用试验。采用单因素浸出实验研究钛精矿酸解固相物中钛的浸出行为规律,探讨液固比、浸出温度、搅拌转速、浸出液酸浓度等参数对钛浸出行为的影响。结果表明:在水为浸出剂、浸出温度为65℃、浸出液固比1.67:1.00、浸出时间40 min、浸出搅拌转速250 r/min条件下,钛精矿酸解固相物中钛的浸出率达到98.04%;动力学分析发现,钛精矿酸解固相物中钛的浸出过程符合内扩散控制的收缩核模型,浸出反应的表观活化能为20.98 kJ/mol。工业应用结果表明,强化浸出后,钛总浸出率由96.42%提高至97.51%。

In order to improve the leaching of titanium from the solid phase of acidolysis of titanium concentrate,the leaching kinetics of titanium was studied and the industrial application experiments were carried out.The leaching behavior of titanium was studied by single factor leaching experiment,and the effects of liquid-solid ratio,reaction temperature,stirring speed and acid concentration on titanium leaching behavior were investigated.The results show that the titanium extraction is 98.04% after leaching for 40 min under the conditions of liquid-solid ratio of 1.67:1.00,temperature of 65℃ and stirring speed of 250 r/min.The leaching process of titanium is fitted to the shrinkage core model which is jointly controlled by the diffusion of steam through the product layer,and the apparent activation energy calculated is 20.98 kJ/mol.The results of industrial application show that the total leaching rates of titanium increase from 96.42% to 97.51% after enhanced leaching.