Preparation of high purity manganese sulfate

Abstract

The invention provides a method for preparing high-purity manganese sulfate. The method comprises that: an impurity-containing manganese sulfate solid is prepared into a solution of manganese sulfate, or manganese ores are leached by sulfuric acid to obtain the solution of manganese sulfate, and the solution of manganese sulfate is added with an impurity removing agent, namely MnF2 to remove impurities such as Ca and Mg, and added with MnS or metal manganese powder which is used as an impurity removing agent for removing heavy metal impurities so as to avoid the introduction of impurities, ensure the impurity removing effect and simultaneously control the pH value to be between 3.5 and 7 in the reaction. The impurity removing agents of the MnF2 and MnS or metal manganese powder can be added at the same time or in order, and then the solution of manganese sulfate is subjected to filtering, normal-pressure concentration, crystallization, dewatering and drying to obtain the high-purity manganese sulfate product. The method has the advantages that: the contents of impurities such as Ca and Mg and heavy metals in the solution of manganese sulfate, which is obtained by using the sulfuric acid to leach the common manganese sulfate product or manganese ores, are obviously reduced, and the contents of Ca, Mg and heavy metal impurities are lower than 50ppm, and the purity of the prepared manganese sulfate reaches more than 99 percent, so that the manganese sulfate prepared by the method can meet the needs 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 using a manganese sulfate solution after ordinary manganese sulfate solid or manganese ore is leached with sulfuric acid. Background technique [0002] Manganese sulfate solid prepared by common method (containing reagent grade manganese sulfate solid) or manganese sulfate solid prepared by common method using manganese ore after leaching with sulfuric acid, its Ca, Mg impurities and heavy metal impurities (Co, Ni, The content of Pb, etc.) is high. Among them, the content of Ca and Mg in the manganese ore can reach more than 3000ppm, and the content of heavy metal impurities (Co, Ni, Pb, Cd, Cr, etc.) is about 300ppm. Even if it is a reagent-grade manganese sulfate solid, its Ca and Mg The content is more than 100ppm. Even though the content of Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) ...

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 the content of Ca and Mg in manganese ore can reach more than 3000ppm, and the content of heavy metal impurities (Co, Ni, Pb, Cd, Cr, etc.) can reach about 300ppm. The content is also more than 100ppm. With general impurity removers, even if the content of Ca, Mg impurities and heavy metal impurities (Co, Ni, Pb, etc.) can be reduced, the purity of the prepared manganese sulfate product is not high due to the introduction of other impurity ions. , the product quality does not meet the requirements of electronic-grade products, and cannot be used as raw materials for ternary materials in the electronics industry (requires calcium and magnesium ions, heavy metal impurities to be less than 50ppm, and manganese content to be greater than 31.8%)

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

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