High-purity manganese sulfide and method for preparing the same

Abstract

The invention relates to high-purity manganese sulfide and a method for preparing high-purity manganese sulfide. The method comprises the following steps of: (1) a pretreatment step: adding manganese sulfide to manganese sulfate solution, and then performing solid-liquid separation; (2) a spray reaction step: adding liquid ammonia to the solution obtained in the step (1) to obtain spray solution; and circularly spraying the spray solution through a circulating pump so that the spray solution joins in a circular spray reaction with hydrogen sulfide gas; terminating the spray reaction until the mass concentration of manganese ions in the reactant solution is less than 500 ppm; and performing solid-liquid separation on the solution after the spray reaction is terminated; and (3) washing and drying, thereby obtaining the manganese sulfide product. The invention also relates to manganese sulfide prepared by the preparation method, wherein the purity of the manganese sulfide is above 99.90wt% and the moisture content of the manganese sulfide is less than 0.5%; the mass content of Fe in the manganese sulfide is less than 0.80 ppm; and preferably, the mass content of each of K and Na is less than 5.0 ppm, while the mass content of Ca is less than 25 ppm and the mass content of Mg is less than 10 ppm, in the manganese sulfide.

Description

technical field [0001] The invention relates to the technical field of inorganic fine chemicals, in particular to a high-purity manganese sulfide and a preparation method thereof. Background technique [0002] Manganese sulfide is used in powder metallurgy, weak magnetic semiconductor materials, optical, electrical and magnetic materials, and preparation of high-purity manganese salts. Traditional high-temperature reduction methods and solid-phase synthesis methods produce products with low purity and high energy consumption. [0003] CN101555040A discloses a kind of preparation method of nano-MnS, but the method prepares MnS to exist NaCl washing difficulty, NaCl 2 S contains a lot of polysulfides, which causes product entrainment. The autoclave reaction in the polytetrafluoroethylene liner cannot be industrially produced on a large scale. Drying in an oven at 60 ° C can easily cause defects such as oxidation, and it is impossible to prepare high-purity MnS products. Cont...

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Problems solved by technology

[0002] Manganese sulfide is used in powder metallurgy, weak magnetic semiconductor materials, optical, electrical and magnetic materials, and preparation of high-purity manganese salts. Traditional high-temperature reduction methods and solid-phase synthesis methods produce products with low purity and high energy consumption.

[0003] CN101555040A discloses a kind of preparation method of nano-MnS, but the method prepares MnS to exist NaCl washing difficulty, NaCl 2 S contains a lot of polysulfides, which causes product entrainment. The autoclave reaction in the polytetrafluoroethylene liner cannot be industrialized and mass-produced. Drying in an oven at 60 ° C can easily cause defects such as oxidation, and it is impossible to prepare high-purity MnS products.

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