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Method for high-purity manganese sulfate monohydrate

A technology of manganese sulfate and pure one, which is applied in the field of preparation of high-purity manganese sulfate monohydrate, which can solve the problems of high raw material cost and many metal impurities, and achieve the effect of less impurities and stable quality

Inactive Publication Date: 2015-04-08
GUANGXI NANNING SHENGRUI METALLURGICAL & CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is: to solve the problem of many other metal impurities and high cost of raw materials in the preparation of manganese sulfate monohydrate

Method used

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  • Method for high-purity manganese sulfate monohydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] C. Gradually add barium hydroxide solution to the solution in step B, and keep stirring until PH = 5.4, then the solid-liquid separation.

[0026] D. According to the Pb content measured in the solution obtained by the solid-liquid separation in step C, add barium sulfide solution with a molar ratio of 2 times, stir evenly, and heat to 60-80°C for solid-liquid separation.

[0027] E. Add the solution obtained from solid-liquid separation in step D into coconut shell activated carbon, stir at 60-80°C for 1-3 hours, and separate solid-liquid.

[0028] F. Add 3 g / m to the solution obtained after solid-liquid separation in step E 3 ~20 g / m 3 The flocculant is polyacrylamide, the flocculation time is 35min to 85min, the flocculation temperature is 70 ℃ to 85 ℃, after stirring evenly, let it stand for 24-36 hours before solid-liquid separation.

[0029] G. High-temperature crystallization of the solution obtained by solid-liquid separation in step F to obtain manganese sulf...

Embodiment approach 2

[0034] The difference from Embodiments 1 and 2 is that in step B, the pH is kept at 3, and the reaction is stirred at room temperature for 3 hours.

Embodiment approach 3

[0036]

[0037] Note: The unit of the data in the table is ppm

[0038] It can be seen from the above table that the impurity content of the high-purity manganese sulfate products obtained in each embodiment of the present invention is relatively low, which can fully meet the requirements of lithium battery positive electrode raw materials.

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Abstract

The invention relates to the preparation field of chemical products and particularly relates to a method for high-purity manganese sulfate monohydrate. The method specifically comprises the following steps of: taking tail powder of electrolytic manganese dioxide as a raw material, carrying out water washing and acid washing, then carrying out leaching and reducing on MnO2 by taking hydrogen peroxide as a reducing agent, adding barium hydroxide solution, removing Fe<3+>, Si<2+> and Al<3+>, adding barium sulfide solution into the obtained solution, heating the solution to 60-80 DEG C after uniform stirring, carrying out solid-liquid separation, and removing heavy metal elements such as Pb; adding activated carbon in the solution, carrying out stirring and solid-liquid separation at 60-80 DEG C, adding polyacrylamide as a flocculant into the solution after being subjected to activated carbon separation, standing for 24-36 hours after uniform stirring, and carrying out the solid-liquid separation; and carrying out high-temperature crystallization on the obtained solution so as to obtain a manganese sulfate monohydrate product. According to the method, the tail powder produced during the production of the electrolytic manganese dioxide is adequately utilized, the high-purity manganese sulfate monohydrate is produced at a relatively low cost, and then manganese sulfate for ternary materials applied to lithium battery industries is further obtained.

Description

technical field [0001] The invention relates to the field of preparation of chemical products, in particular to a preparation method of high-purity manganese sulfate monohydrate. Background technique [0002] Manganese sulfate is a basic chemical raw material. Manganese sulfate monohydrate can be obtained by drying at high temperature. Manganese sulfate used for ternary materials in the lithium battery industry has relatively strict requirements on indicators such as K, Na, Ca, Mg, Fe and heavy metals. There are many traditional methods for preparing manganese sulfate, but the prepared manganese sulfate often contains more metal impurities, which cannot meet the requirements of high-performance lithium batteries. CN102674467A discloses a preparation method of manganese sulfate. The method uses metal manganese as a raw material, through the 2 SO 4 React with MnS and remove other impurities to obtain high-purity manganese sulfate. This method uses high-purity metal manga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/10
Inventor 周佩楠
Owner GUANGXI NANNING SHENGRUI METALLURGICAL & CHEM TECH