Preparation of lithium carbonate using potassium carbonate as precipitator and optimization of reaction crystallization conditions
Sodium carbonate will produce a large amount of carbon emissions,wastewater and waste residue in the production process,which may pose a threat to the environment.This article used potassium carbonate instead of sodium carbonate as a precipitant for preparing lithium carbonate,and added ultrasound during the reaction crystalliza-tion process to control the formation of large aggregates in lithium carbonate.Response surface methodology was used to optimize the main reaction crystallization conditions,and variance analysis was conducted on the potassium content and particle size D50 in lithium carbonate,The results show that the potassium content fitting model is significant(P=0.000 2,F=24.47),with a fitting coefficient 0.969 2,a modified fitting coefficient 0.929 6,and a predicted fitting coefficient 0.875 1,meeting the requirements of analysis of variance;The particle size D50 fitting model is significant(P=0.000 2,F=24.91),with the fitting coefficient 0.9697 7,the modified fitting coefficient 0.930 8,and the pre-dicted fitting coefficient 0.747 2,meeting the requirements of analysis of variance.The main influencing factor of potassium content in lithium carbonate is temperature,and there is a significant interaction between reaction crystalli-zation temperature and ultrasonic power;The main influencing factors on the particle size D50 of lithium carbonate are temperature and ultrasonic power,but the interaction between these factors is not significant.The optimal conditions have been verified,with an average potassium content of 0.899 mg/g lithium carbonate,an average particle size D50 of 17.346 μm,and an average yield of 86.91%.The predicted values are close to the experimental values.
lithium carbonatepotassium carbonateresponse surface methodultrasonicparticle size distributionanalysis of variancepotassium content
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维普
