Preparation of high purity manganese sulfate

Abstract

The invention provides a method for preparing high-purity manganese sulfate. The method comprises the following steps: preparing a manganese sulfate solid containing impurities into a manganese sulfate solution, or leaching manganese ore in sulfuric acid to obtain the manganese sulfate solution; adding an impurity removing agent MnF2 into the manganese sulfate solution to remove impurities which are Ca and Mg; using MnS or metal manganese powder as the impurity removing agent to remove heavy metal impurities so as to avoid the introduction of impurities and ensure the effect of impurity removal, and simultaneously controlling the pH value for reaction to between 4 and 10. The impurity removing agent MnF2 and MnS or the metal manganese powder can either be simultaneously added, or added one after another respectively to obtain the high-purity manganese sulfate through filtering, concentrating at normal pressure, crystallizing, dehydrating and drying. The method has the advantages that the method can obviously reduce the amount of Ca and Mg impurities and heavy metal impurities contained in a common manganese sulfate product or the manganese sulfate solution after the manganese ore is leached by sulfuric acid, and ensure that the content of Ca and Mg is lower than 100 ppm, and the content of the heavy metal impurities is lower than 50 ppm, and purity of the obtained manganese sulfate product can reach over 99 percent to meet the requirement of the manganese sulfate product used for ternary materials in the electronic industry.

Description

technical field [0001] The invention relates to a method for preparing high-purity manganese sulfate, in particular to a method for preparing high-purity manganese sulfate by utilizing ordinary manganese sulfate solid or manganese sulfate solution leached with sulfuric acid. Background technique [0002] Manganese sulfate solid (containing reagent-grade manganese sulfate solid) prepared by common method or manganese sulfate solid prepared by common method from manganese sulfate solution leached by manganese ore with sulfuric acid, its Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) content is high, among which Ca, Mg content can reach about 5000ppm, and heavy metal impurities (Co, Ni, Pb, Cd, Cr, etc.) content can reach about 300ppm. About 500-1000ppm, with general impurity remover, even if the content of Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) can be reduced, the prepared manganese sulfate product is not high in purity, and the produc...

AI Technical Summary

Problems solved by technology

[0002] Manganese sulfate solid (containing reagent-grade manganese sulfate solid) prepared by common method or manganese sulfate solid prepared by common method from manganese sulfate solution leached by manganese ore with sulfuric acid, its Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) content is high, among which Ca, Mg content can reach about 5000ppm, and heavy metal impurities (Co, Ni, Pb, Cd, Cr, etc.) content can reach about 300ppm. About 500-1000ppm, with general impurity remover, even if the content of Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) can be reduced, the prepared manganese sulfate product is not high in purity, and the product quality cannot reach electronic grade products requirements, and cannot be used as raw materials for ternary materials in the electronics industry

As a result, its product quality is not high and its added value is not high, which affects its application