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Aiming at the problems such as long production cycle, low utilization rate of carbon dioxide and difficult to meet the standard requirements of battery grade lithium carbonate produced by traditional carbonization decomposition method, the preparation of battery grade lithium carbonate by sodium carbonate--shear carbonization--ion exchange--heating decomposition process was studied using low-grade leachite ore as raw material. The results show that the removal rates of calcium, magnesium and manganese are 97.26%, 81.82% and 95.73 %, respectively, under the conditions of 30 °C, liquid volume/solid mass ratio of 25/1, carbon dioxide input rate of 0.5 L/rnin and shear speed of 6 000 r/min. The shear assisted carbonization method can significantly improve the carbonization reaction rate, shorten the reaction time, save more than 70% of CO2, and is more conducive to the production of battery grade lithium carbonate. The prepared lithium carbonate can meet the standard of battery grade lithium carbonate. [ABSTRACT FROM AUTHOR]