Study of Preparation of High-Purity Manganese Sulfate from Manganese Containing Waste Liquid in the Recycling of Waste Batteries
The production process of high purity manganese sulfate product was studied by using manganese-containing waste battery leaching solution as raw material,precipitation of manganese fluoride to remove calcium,precipitation of aluminum sulfate to remove fluorine,and finally evaporation and crystallization.The optimum process conditions are determined as follows:The amount of manganese fluoride added was 18 g/L,the temperature was 40℃,the reaction time was 1 h,the reaction pH was 4,and the calcium-removing liquid was obtained by separation and precipitation after the reaction.Aluminum sulfate octahydrate was added according to the aluminum-fluorine mass ratio 2.2,and the reaction temperature was controlled by 60℃ .After the reaction,the purification liquid was obtained by filtration,and high purity manganese sulfate products were obtained by evaporation and crystallization after pH adjustment.The contents of main components and impurities meet the requirements of battery grade manganese sulfate.Combined with the experimental study,the pilot test is carried out,which provides a reference for the realization of low cost and stable process of high purity manganese sulfate purification and impurity removal technology.
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