Lithium carbonate (Li2CO3) is used as raw material to prepare various lithium compounds

so the reactive crystallization of lithium carbonate is the key technique in the lithium industry. Central composite design(CCD)

a kind of response surface methodology

was used to explore the effects of temperature

feeding speed of sodium carbonate (Na2CO3)

concentration of Na2CO3 and concentration of lithium chloride(LiCl) on the yield of Li2CO3 and the particle size of Li2CO3. Based on the regression analysis

regression equations related to response values and factors were established

respectively. The optimal simulated values were found as follows:yield of Li2CO3 93.68%

the median particle sizes (d50) 16.73 μm

while the corresponding experimental results were 94.01% and 16.91 μm

respectively. The errors between the predicted and experimental values were small

which showed that the established models were accurate and reliable for the analysis and prediction of the process of reactive crystallization. In the above conditions

battery-grade Li2CO3 were prepared and its purity reached 99.52%. No impurity peak could be observed in the XRD analysis of Li2CO3 product

and its main crystal faces were (-1 1 0)

(-2 2 0) and (0 0 2).