Study on crystallization kinetics of manganese sulfate monohydrate in H2SO4-H2O binary system
In order to improve the quality of monohydrate manganese sulfate crystal products and guide the design of mono-hydrate manganese sulfate crystallization process,the solubility data of monohydrate manganese sulfate in the H2SO4-H2O binary system was measured by dynamic method.The solubility data was fitted using the Apelblat equation,and the relation-ship between the parameters of the Apelblat equation and pH value was obtained.The solubility data showed that in the H2SO4-H2O binary system,the saturation solubility of manganese sulfate monohydrate was rapidly decreased with the de-crease of system pH.The nucleation and growth rates of monohydrate manganese sulfate crystals were measured at different pH values in the MSMPR crystallization system.The results showed that a decrease in pH had a significant promoting effect on the growth of monohydrate manganese sulfate crystals and an inhibitory effect on crystal nucleation.Based on the particle balance equation,the nucleation and growth rates of monohydrate manganese sulfate crystals were calculated,and the nucle-ation and growth rate equations under different pH conditions were obtained.Finally,the POLY2D equation was used to fit the nucleation and growth rates of manganese sulfate monohydrate crystals.The relevant research results could provide refer-ence for the design of industrial crystallization process of manganese sulfate monohydrate.
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