草酸浸出Na_8Ti_5O_(14)制备草酸氧钛钠的工艺  

Synthesis of Sodium Titanyl Oxalate Trihydrate by Leaching of Na_8Ti_5O_(14) with Oxalic Acid

作　　者：杜志华[1,2] 杨轩[2] 张绘[2] 齐涛[2] 宋宁[1] 谢刚[1] 王硕[2] 郭九吉[2] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650032 [2]中国科学院过程工程研究所绿色过程工程实验室,湿法冶金清洁生产技术国家工程实验室,北京100190

出　　处：《过程工程学报》2014年第6期955-960,共6页The Chinese Journal of Process Engineering

基　　金：国家科技支撑计划基金资助项目(编号:2012BAF03B01)

摘　　要：用草酸浸出多钛酸钠Na8Ti5O14,获得含钛料液,通过蒸发结晶成功制备了纯度99%的草酸氧钛钠产品,对产物进行了表征,考察了反应温度、反应浓度、反应时间、搅拌强度对钛浸出率的影响,得到了优化条件为:草酸浓度4 mol/L,反应温度80℃,反应时间2 h.研究了浸出反应的动力学,计算得到表观活化能为43.85 k J/mol,浸出过程属于未反应核收缩模型,速率为界面化学反应控制.Leachate solution containing titanium and sodium was acquired by leaching of cheaper sodium titanate Na8Ti5O14 with oxalic acid.The product of sodium titanyl oxalate with high purity of 99% was obtained successfully by evaporation crystallization,and characterized by XRD,IR,SEM,etc.The effects of the concentration of oxalic acid,reaction temperature,reaction time and stirring intensity on leaching rate of titanium were investigated,and the optimum process conditions obtained：concentration of oxalic acid 4 mol/L,reaction temperature 80 ℃,and reaction time 2 h.The temperature leaching kinetics was studied.The experimental results showed that the apparent activation energy was determined as 43.85 kJ/mol,the leaching of titanium followed the shrinking core model with surface reaction control.

关 键 词：草酸氧钛钠 草酸 合成 浸出 动力学 

分 类 号：TQ174.758[化学工程—陶瓷工业]