摘要
本文采用氢化-离子交换法,对含高钙、镁及硫酸根杂质的碳酸锂进行提纯,研究不同温度下固液比对氢化率的影响,并对母液循环后产品中钙、镁和硫的富集情况进行监测。得出了不同季节下的最佳氢化条件:春秋两季固液比为1∶20,夏季为1∶24,冬季为1∶19,氢化时间为60min,氢化率达到99.5%以上。使用树脂吸附除钙镁,随着母液循环次数的增加,所得碳酸锂钙镁杂质低于20×10^(-6),而硫酸根含量逐渐升高,当母液中硫酸根含量达到1.1g·L^(-1),需要将母液开路,碳酸锂的总收率为97.6%左右。
Lithium carbonate with high content of Ca^（2＋）, Mg^（2＋）, and SO4^（2-）was purified via hydrogenation-ion exchange method. The influence of solid/liquid ratio on degree of hydrogenation under different temperatures was investigated, and the enrichment of Ca^（2＋）, Mg^（2＋）, and SO4^（2-）in the product during mother liquid circulation was monitored. The optimal hydrogenation conditions were determined as followed： the solid/liquid ratio was 1：20 for spring and autumn, 1：24 for summer and 1：19 for winter, respectively. The hydrogenating degree of lithium carbonate was over 99.5% after 60 min. The Ca^（2＋） and Mg^（2＋） content in refined lithium carbonate were lowered to less than 20 ppm by resin adsorption however, SO4^（2-）concentration would increased as the mother liquid circulated. The mother liquid should be discarded when the SO4^（2-）concentration reached 1.1 g/L. The overall yield of lithium carbonate was approximately 97.6% through this procedure.
作者
刘人生
田礼平
熊铜兴
LIU Rensheng, TIAN Liping, XIONG Tongxing(Zhejiang Huayou Cobalt Co. Ltd., Tongxiang 314500, China)
出处
《化工技术与开发》
CAS
2018年第7期5-7,41,共4页
Technology & Development of Chemical Industry
关键词
碳酸锂
氢化
离子交换
母液循环
lithium carbonate
hydrogenation
ion exchange
mother liquid circulation
