Process Optimization of Li₂CO₃Preparation from Lithium-Containing Wastewater Based on Box-Behnken Response Surface Method AITranslate

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Chinese Library Classification Number:TQ133.11[化学工程—无机化工]

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Li₂CO₃was prepared by carbonate precipitation from lithium-containing wastewater produced in the process of producing Al2O3 from fly ash with hydrochloric acid method.The effects of lithium precipitation temperature,stirring rate and feeding rate on the purity and particle size of Li₂CO₃were studied.The Box-Behnken response surface method was used to optimize the preparation process of Li₂CO₃.The results show that increasing lithium precipitation temperature is beneficial to the growth and purity of Li₂CO₃grains,and Li₂CO₃is easy to form rod-like crystal at higher temperatures.Stirring rate has little effect on the purity of Li₂CO₃products,and suitable stirring rate is conducive to the growth of Li₂CO₃crystal.The lower feeding rate can promote the full growth of Li₂CO₃crystal and reduce the probability of peritectic phenomenon.The optimum conditions for Li₂CO₃preparation are lithium precipitation temperature of 90℃,stirring rate of 200 r/min and feeding rate of 2%/min.The Li₂CO₃prepared under the optimum conditions has the best quality with purity of≥96.71%and average particle size of≤7.35μm.