Study on agglomeration phenomenon and regulation method of lithium carbonate crystal prepared from potassium carbonate
Lithium carbonate was prepared by reaction crystallization using lithium chloride and potassium carbonate as raw materials.The experimental conditions such as reaction temperature,stirring speed,seed addition amount,and seed par-ticle size were investigated with the aim of improving the yield of lithium carbonate,reducing its potassium content,and ob-taining a good particle size distribution.The experiment showed that there was a significant crystal agglomeration phenom-enon in the reaction crystallization of lithium chloride and potassium carbonate.Different reaction temperatures had a signifi-cant impact on the crystal morphology,with crystals showing flake-like agglomerates at low temperatures and rod-like ag-glomerates at higher temperatures.The increase of shear force could reduce the size of agglomerates,and the addition of seed crystals was beneficial to suppress explosive nucleation,reduced crystal agglomeration and wall sticking.The experi-mental results showed that when the reaction temperature was 85℃,the stirrer speed was 400 r/min,the lithium chloride concentration was 3.2 mol/L,the seed addition amount was 3.0 g/L,the seed particle size was controlled to be less than 54 μm,and the ultrasonic power was 100 W for 150 min,the yield of lithium carbonate was high,the crystals were not prone to coalescence,the potassium content was low,and the particle size distribution was good.The yield of lithium carbon-ate prepared using potassium carbonate as raw material was comparable to that prepared using sodium carbonate as raw ma-terial,but the impurity content was reduced to some extent.Adding ultrasound during the reaction crystallization process could effectively avoid the formation of large agglomerates,and the potassium content was significantly reduced while ensur-ing the yield of lithium carbonate was not significantly reduced.The experimental conditions obtained through the study could provide a basis for adjusting process parameters in the production of lithium carbonate,and provide guidance for im-proving product quality.
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