Preparation method of manganese sulfate for electrolytic manganese dioxide

Abstract

The invention belongs to the field of battery material processing, and specifically relates to a preparation method of manganese sulfate for electrolytic manganese dioxide. The preparation method comprises the steps of manganese sulfate leaching and neutralization for iron removal, impurity removal of heavy metals, electrolysis and post-processing; concretely, manganese oxide ore powder, pyrite powder and an industrial sulphuric acid are subjected to high-temperature and high-pressure leaching in the presence of SO2 so as to prepare a coarse manganese sulfate solution, then the coarse manganese sulfate solution is subjected to iron removal by using calcium carbonate and subjected to primary heavy metal removal by using barium sulphide, and an adsorbent is added to secondarily remove trace elements, so that the concentrations of the trace elements such as As, Sb and Mo are all less than or equal to 0.005 ppm, thereby obtaining a manganese sulfate solution with a good quality. The content of impurities such as Fe, Cu, Pb, Ni, Co, K, Na, Ca, Mg, and the like in the manganese sulfate solution prepared by using the method disclosed by the invention is low, wherein the content of Cu is less than or equal to 2.0 ppm, the content of Pb is less than or equal to 3.0 ppm, the content of Ni is less than or equal to 2.0 ppm, and the content of Co is less than or equal to 2.0 ppm.

Description

technical field [0001] The invention belongs to the field of battery material processing, in particular to a preparation method of manganese sulfate for electrolytic manganese dioxide. Background technique [0002] The preparation of high-purity manganese sulfate solution is an essential pre-process for the manufacture of electrolytic manganese dioxide (EMD) for alkaline zinc-manganese batteries. The development of alkaline zinc-manganese dry batteries has put forward higher and higher requirements for EMD. Its chemical purity is one aspect of this. According to earlier information, the chemical impurities of EMD that affect battery performance can be divided into active components (Hg); nearly harmless components (Mg, Na, Mn); slightly harmful components (Cd, Fe); quite harmful components ( Ni, Co, Mo, Cu) and the most harmful components (Sb, As). These components not only refer to the quantity, but also are related to the valence state, the solubility in the electrol...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low manganese sulfate rate, poor impurity removal effect and high impurity removal cost in the preparation method of the existing electrolytic manganese dioxide electrolyte—manganese sulfate solution. SO 2 Catalysis, introducing Ca(MnO 4 ) 2 , NaMnO 4 MnO in 4 － As an adsorbent, a preparation method of manganese sulfate for electrolytic manganese dioxide is provided