反应结晶制备碳酸锂的粒度及形貌控制  

Size and morphology controlling of lithium carbonate in reactive crystallization process

作　　者：王彦飞[1] 王磊鑫[1] 邢红 杨静[1] 赵艳平[1] 杨立斌[1] 朱亮[1] 赵晓昱[1] 沙作良[1] 王文海 

机构地区：[1]天津科技大学化工与材料学院,天津市海洋资源与化学重点实验室,天津300457 [2]青海盐湖佛照蓝科锂业股份有限公司

出　　处：《无机盐工业》2016年第9期13-17,共5页Inorganic Chemicals Industry

基　　金：青海省科技厅科技支撑计划(2015-GX-109A);教育部科研创新团队培育计划([2013]373);天津市高等学校创新团队培养计划(TD12-5004)

摘　　要：碳酸锂的粒度及形貌决定其性能和应用。通过考察反应结晶温度、进料速率、晶种用量和搅拌速率对碳酸锂产品平均粒径的影响以及添加剂的用量对产品形貌的影响,提供了一种经过优化的制备碳酸锂的反应结晶工艺。通过正交实验确定了反应结晶制备碳酸锂的最佳实验条件:200 m L质量浓度为90 g/L的氯化锂溶液一次性加入反应结晶器内,质量浓度为260 g/L的碳酸钠溶液的加料速率为0.5 m L/min,晶种用量为2%(占碳酸锂理论产量的分数),搅拌速率为400 r/min,反应温度为80℃,添加剂六偏磷酸钠用量为2%(占碳酸锂理论产量的分数)。在此条件下制得的碳酸锂为平均粒径为132μm、变异系数为51.53%的密实球形产品。研究表明,反应温度对晶体粒度的影响最大,添加剂对晶体的粒度和形貌起到调控作用。The properties and applications of lithium carbonate depend on its size and morphology.A novel size and morphology controlling technology of lithium carbonate in reactive crystallization process was proposed.The effects of reactive crystallization temperature ,feeding rate ,seeding dosage ,and stirring rate on the average particle size and the effect of additive on the morphology were investigated.By study of orthogonal experiments, the optimal experimental conditions for the reactive crystallization of lithium carbonate were concluded by ：put 200 mL lithium chloride solution with mass concentration of 90 g/L into the reaction crystallizer,the sodium carbonate solution with mass concentration of 260 g/L was fed with the rate of 0.5 mL/min ,seeding dosage was 2% （relative to the mass fraction of lithium carbonate theoretical yield）,stirring rate was 400 r/min, reactive temperature was 80 oC and additive was 2% （relative to the mass fraction of lithium carbonate theoretical yield） sodium hexametaphosphate.Under those conditions, the product was a dense spherical product with the average size of 132 μm and with the variation coefficient of 51.53%.The study showed that size of particles was mainly determined by reactive temperature, and the additive, however, played an adjustable effect on both size and morphology.

关 键 词：反应结晶 碳酸锂 粒度分布 形貌 添加剂 

分 类 号：TQ131.11[化学工程—无机化工]