Study On Removal Of Calcium And Magnesium,Potassium And Sodium By Solvent Extraction From The Solution Of Manganese And Its Application

Abstract:With the battery industry developing, the increasingly strict demand of quality performance of manganese sulfate products calls for a novelty method to separate and purify manganese efficiently with low cost even in large scale ontinuous production.Manganese, which meets the requirement of high purity manganese sulfate for battery, was extracted from a simulated multi-metal manganese sulfate solution rich in calcium, magnesium, potassium and sodium by extractant A.The manganese extraction ratio and the average content of manganese in the loaded organic phase reached85.34%and13.5g/L, respectively, and the reaction conditions are as follows:the volume concentration of the extractant is30%, the saponification ratio is50%, the phase ratio (O/A) is4:1in two-stage countercurrent extraction and with stirring for10min at40℃.A two-stage countercurrent stripping of manganese from the loaded organic phase proceeded by2M sulfuric acid with the phase ratio (O/A) of8:1at40℃, and the stripping ratio of manganese reaches99.94%. In the stripped solution, the average content of manganese is107.89g/L, and the concentration of calcium, magnesium, potassium and sodium are all less than15mg/L. Treating stripped solution by activated carbon adsorption, condensation crystallization and desiccation, and then manganese sulfate monohydrate, which meets the requirement of high purity manganese sulfate for battery was obtained.The extraction effect was studied on the condition that the aqueous phase is saturated impurity ions solution, and the effect of different kinds of extractants in chlorating system was also studied. High purity manganese carbonate was prepared by chemistry precipitation method, and in this reaction system, the ammonium hydrogen carbonate and the obtained high purity manganese sulfate solution were the main materials. Through2-stage pyrolysis, the manganese carbonate converted to Mn2O3which then transformed into product MnO2by acid leaching. The XRD pattern shows that crystal system of obtained MnO2is consistent with electrolytic manganese dioxide (EMD), and the main crystal system is ε-MnO2.