This article presents a method for producing battery-grade lithium carbonate from industrial-grade lithium carbonate.Initially,industrial-grade lithium carbonate or lithium hydroxide is slurried,followed by the introduction of carbon dioxide into a carbonization tower for a carbonization reaction.After precision filtration and resin impurity removal,the mixture is sent to a thermal decomposition tank for steam heating and decomposition.The precipitated lithium carbonate solid is then centrifugally separated,washed,dried,crushed,removed magnetic material,and packaged to obtain the battery-grade lithium carbonate product.The carbonization system in this method employs multi-stage series operation,with the lithium carbonate slurry and carbon dioxide gas operating in countercurrent,and the reaction liquid is recycled through mother liquor circulation,these methods effectively improving the conversion rate of lithium carbonate,producing high-purity products,significantly reducing production costs,and increasing the economic benefits of the product.
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