关键词: 反应结晶, 碳酸锂, 盐湖, 添加剂, 聚丙烯酸

Abstract: China produced lithium carbonate from spodumene mostly.However，producing high quantity lithium carbonate from lithium-rich salt lakes has a vast potential for future development.The preparation process of lithium carbonate by reac- tive crystallization with sodium chloride and sodium carbonate was studied.The effects of Na2CO3 addition，stirring rate，reac- tion temperature，concentration of LiCl，feeding methods，and additive on the process of reactive crystallization were investigated.The optimal conditions were obtained as follows：back-feeding way was adopted during the reaction，addition of Na2CO3 was 110% of theoretical dosage，stirring rate was 400 r/min，reaction temperature was 80 ℃，concentration of LiCl was 3.2 mol/L.Results showed that stirring rate had slight influence on the yield；addition of Na2CO3，reaction temperature，and concentration of LiCl had affect on the yield；and reaction temperature and concentration of LiCl had an obvious influence.Feeding methods and PAA could change the morphology of Li2CO3；reaction temperature，stirring rate，concentration of LiCl， and PAA all could affect the purity of Li2CO3.

Key words: reaction crystallization, lithium carbonate, salt lake, additive, polyacrylic acid