氟盐法净化锰电解液中镁离子的研究

doi:10.19964/j.issn.1006-4990.2023-0454

Abstract

Abstract:

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 removal effect of magnesium were investigated.The results showed that when the ammonium fluoride was used as the precipitant，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 analysis：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.

Key words: manganese sulfate, fluoride salt method, magnesium removal rate, fluoride remover

CLC Number:

TQ132.2

LU Ju, WANG Jiawei, WANG Haifeng, PEI Zhengqing, ZHOU Xingjie, ZHENG Kexin, MA Dehua. Study on purification of magnesium from manganese electrolyte by fluorine salt method[J]. Inorganic Chemicals Industry, 2024, 56(6): 40-45.

Figures/Tables 9

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Table 1

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Study on purification of magnesium from manganese electrolyte by fluorine salt method

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