Study on purification of magnesium from manganese electrolyte by fluorine salt method
Metal manganese prepared by electrolysis is widely used because of its high purity and small pollution.The cyclic rich accumulation of magnesium ions in the production process will cause great harm to the system.In order to reduce the concentration of magnesium ions and ensure the normal production of electrolysis,the research objective was to reduce the mass concentration of magnesium ions to 15～20 g/L and the removal of magnesium from manganese electrolyte by fluorine salt method was carried out.The effects of precipitant type,dosage coefficient,stirring time,temperature and pH on the re-moval effect of magnesium were investigated.The results showed that when the ammonium fluoride was used as the precipi-tant,with the increase of precipitation agent,stirring time,the reaction temperature,and system pH,the concentration of magnesium ions was gradually decreased and reached a certain level,and the optimal conditions for impurity removal using ammonium fluoride as a precipitant were as follows:the temperature was 50 ℃,the stirring time was 50 min,the pH was 5～6,and the amount of precipitant was 80％of the theoretical amount,the concentration of magnesium ions in the solution could be reduced to 15.6 g/L,and the residual fluoride content was 1.7 g/L.The solution after magnesium removal was treated with low-cost nano-fluoride removal agent,and the following results could be obtained by using EDS and ICP analy-sis:the concentration of fluoride ion was reduced to less than 100 mg/L,and the content of aluminum in the fluoride removal agent in the manganese sulfate solution was only 2.51×10-4 g/L,which could meet the production demand of electrolytic manganese industry.
manganese sulfatefluoride salt methodmagnesium removal ratefluoride remover
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