溶析结晶制备碳酸锂的实验研究  

Experimental Study on Preparation of Lithium Carbonate by Anti-Solvent Crystallization

作　　者：吴然昊 程卓 李春丽 张焕焕 杨虎 张峰榛 Wu Ranhao;Cheng Zhuo;Li Chunli;Zhang Huanhuan;Yang Hu;Zhang Fengzhen(College of Chemical Engineering,Sichuan University of Science&Engineering,Zigong,Sichuan,643000)

机构地区：[1]四川轻化工大学化学工程学院,四川自贡643000

出　　处：《中国井矿盐》2023年第3期30-32,共3页China Well and Rock Salt

基　　金：四川轻化工大学研究生创新基金项目(y2021017)。

摘　　要：本文以质量分率3%的氯化锂水溶液为模拟卤水,以碳酸钠溶液为沉淀剂,以丙酮为溶析剂,采用溶析结晶方法,制备了碳酸锂产品。考察了碳酸钠溶液浓度、丙酮用量、结晶温度对产品收率的影响。实验结果表明:增大碳酸钠溶液浓度、增加丙酮用量、提高结晶温度皆可提高产品收率,但过高的碳酸钠溶液浓度可能会降低产品纯度;在碳酸钠溶液质量分率为16.7%,丙酮、氯化锂溶液和碳酸钠溶液体积比为1:1:1,温度为40℃条件下,制备的碳酸锂产品,其收率高达83.3%,形貌为棒状。本研究为低锂卤水提取锂盐提供了新途径。In this paper,the preparation of lithium carbonate by anti-solvent crystallization with the simulated brine of 3 wt%lithium chloride solution,sodium carbonate solution as precipitant and acetone as anti-solvent.The effects of sodium carbonate concentration,acetone dosage and temperature on product yield were investigated.The experimental results show that the product yield can be improved by increasing the sodium carbonate solution concentration,the acetone dosage and the temperature,but the high concentration of sodium carbonate may reduce the product purity.Under the conditions of the sodium carbonate solution of 16.7 wt%,the volume ratio of 1:1:1 of acetone,lithium chloride and sodium carbonate solution,and the temperature of 40℃,the product yields of lithium carbonate can reach 83.3%,and the product morphology is rod-like.This study provides a novel way for extracting lithium salt from low lithium brine.

关 键 词：碳酸锂 溶析结晶 沉淀剂 溶析剂 收率 

分 类 号：TS37[轻工技术与工程]