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Method for preparing electronic-grade manganese carbonate from rhodochrosite

A technology of rhodochrosite and manganese carbonate, applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc., can solve the problems of low sodium content, no consideration of solution purification, etc., and achieves simple process operation, convenient large-scale production, and production cost. reduced effect

Inactive Publication Date: 2016-11-23
谢文刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider the purification of the solution, and the product only has a low sodium content

Method used

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Examples

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Effect test

Embodiment 1

[0012] Example 1: low-grade rhodochrosite ore, containing 13.45% manganese. Grinding fineness: 85-90 mesh, liquid-solid ratio 5: 1, leaching time 6 hours, temperature 70 ° C, sulfuric acid weight percent concentration is 27%, filter . The filtrate was adjusted to pH = 6.5 with 15% ammonia water by weight, and iron and aluminum were removed by filtration to obtain a manganese sulfate solution with a manganese leaching rate of 93%. Add ammonium sulfide saturated solution to the manganese sulfate solution to remove heavy metal ions, and the molar concentration of ammonium sulfide is 0.1M. Add 2% ammonium fluoride and 1% ammonium bifluoride to remove calcium and magnesium, filter impurity precipitates, and obtain purified manganese sulfate solution. Add a compound silicon remover, and filter to obtain a purified manganese sulfate solution. Add metered ammonia water to the manganese sulfate solution at one time, fill with carbon dioxide gas, the amount is 1.1 times of the theoret...

Embodiment 2

[0013] Example 2: Low-grade rhodochrosite ore, containing 13.58% manganese. Grinding fineness: 85-90 mesh, liquid-solid ratio 5: 1, leaching time 6 hours, temperature 70 ° C, sulfuric acid weight percent concentration is 27%, filter . The pH of the solution was adjusted to 6.5 with 15% by weight ammonia water, and the iron and aluminum were removed by filtration to obtain a manganese sulfate solution with a manganese leaching rate of 94%. Add ammonium sulfide saturated solution to the manganese sulfate solution to remove heavy metal ions, and the molar concentration of ammonium sulfide is 0.1M. Add 2% ammonium fluoride and 1% ammonium bifluoride to remove calcium and magnesium, and filter impurity precipitates to obtain purified manganese sulfate solution. Add a compound silicon remover, and filter to obtain a purified manganese sulfate solution. Add metered ammonia water to the manganese sulfate solution at one time, fill with carbon dioxide gas, the amount is 1.1 times of ...

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PUM

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Abstract

The invention provides a method for preparing electronic-grade manganese carbonate from rhodochrosite. According to the method, rhodochrosite with high impurity content, low manganese content, rich reserves and low price is used as a raw material; ammonia water and carbon dioxide gas are used as carburization agents; and rhodochrosite is subjected to extraction of manganese sulfate, removal of iron aluminum, removal of copper, nickel, lead, cobalt and zinc, removal of calcium and magnesium, removal of silicon and suspended solids, and carbonization of manganese sulfate so as to prepare manganese carbonate. Compared with the prior art, the method provided by the invention has the advantages that production cost is reduced by about 30%; and the method is simple to operate and convenient for large-scale production.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, in particular to a method for preparing electronic-grade manganese carbonate by using rhodochrosite as raw material. Background technique [0002] High-purity manganese carbonate is the raw material for manufacturing soft magnetic ferrite for telecommunication equipment, synthesizing manganese dioxide and other manganese salts, catalyst for desulfurization, pigment for enamel, paint and varnish, used as fertilizer and feed additive, etc., in industrial and agricultural national economy It is widely used in production. The traditional process of producing manganese carbonate is to use manganese ore to leaching to obtain manganese sulfate solution, and then react with carbonate for precipitation. The traditional process needs to prepare carbonate solution and use a large amount of water, and the carbonization efficiency and product quality need to be improved; the patent number is C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00
Inventor 谢文刚
Owner 谢文刚
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