Abstract:Lithium carbonate was prepared from lithium solution extracted from salt lake brine by adsorption method and sodium carbonate. Effects of reaction time，lithium concentration, reaction temperature，stirring speed and washing conditions on preparation of lithium carbonate were studied. The results show that large and uniform particle size of lithium carbonate with precipitation rate of lithium of 85% above can be obtained under the optimum conditions including 400 g/L sodium carbonate solution as precipitant, lithium mass concentration of 18 g/L, reaction temperature of 30 ℃, stirring speed of 130 r/min, and reaction time of 1 h. The products with lithium carbonate content of 99% and lithium loss in washing process of 2% can be obtained by three-stage countercurrent precipitation washing with volume ratio of water to solid of 2︰1, and washing temperature of 80~90 ℃.