Method for treating waste sulfuric acids by rhodochrosite to prepare high-purity manganese sulfate and hydrate thereof

A technology of rhodochrosite and manganese sulfate, applied in manganese sulfate and other directions, can solve the problem of high cost, achieve the effects of high profit, elimination of chemical waste residue and low cost

Inactive Publication Date: 2011-06-15
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has dealt with the waste sulfuric acid produced by the titanium dioxide industry to a certain extent, the cost is still relatively high
At present, there is no better way to solve the problem of waste acid treatment and utilization of titanium dioxide, and there is no relevant report on the method of using rhodochrosite to treat waste sulfuric acid to prepare high-purity manganese sulfate and its hydrate

Method used

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  • Method for treating waste sulfuric acids by rhodochrosite to prepare high-purity manganese sulfate and hydrate thereof
  • Method for treating waste sulfuric acids by rhodochrosite to prepare high-purity manganese sulfate and hydrate thereof

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Effect test

Embodiment 1

[0030] The method for preparing high-purity manganese sulfate and hydrate thereof by treating waste sulfuric acid with rhodochrosite, the preparation steps are as follows:

[0031] 800kg rhodochrosite is crushed into 60 mesh coarse powder and put into the leaching tank 1 of 15% hydrochloric acid with volumetric concentration, between rhodochrosite coarse powder (calculating with 13% manganese) and hydrochloric acid with a pure mass ratio of 1: 0.43 leaching for 6 hours;

[0032] The solid-liquid mixture after leaching is filtered by the first filter 2, and the filter cake impurities are calcined or deeply buried; the clarified filtrate is manganese chloride tetrahydrate. The filtrate is pretreated with an appropriate amount of manganese hydroxide to obtain manganese chloride liquid and sulfuric acid with a pure mass ratio of 1: 0.58 and put into the first anticorrosion reactor 3 successively for stirring reaction. The pure mass ratio of the filtrate and calcium hydroxide is as...

Embodiment 2

[0036] The method for preparing high-purity manganese sulfate and hydrate thereof by treating waste sulfuric acid with rhodochrosite, the preparation steps are as follows:

[0037] 800kg rhodochrosite is crushed into 90 mesh coarse powder and put into the leaching tank 1 of 18% hydrochloric acid with volume concentration, between rhodochrosite coarse powder (calculating with 13% manganese) and hydrochloric acid with pure mass ratio of 1: 0.63 leaching for 8 hours;

[0038] The solid-liquid mixture after leaching is filtered by the first filter 2, and the filter cake impurities are calcined or deeply buried; the clarified filtrate is manganese chloride tetrahydrate. The filtrate is pretreated with an appropriate amount of manganese hydroxide to obtain manganese chloride liquid and sulfuric acid with a pure mass ratio of 1: 0.78 and put into the first anticorrosion reactor 3 successively for stirring reaction. The pure mass ratio of the filtrate and calcium hydroxide is as follo...

Embodiment 3

[0042] The method for preparing high-purity manganese sulfate and hydrate thereof by treating waste sulfuric acid with rhodochrosite, the preparation steps are as follows:

[0043] 800kg rhodochrosite is crushed into 120 mesh coarse powder and put into the leaching tank 1 of 20% hydrochloric acid with a volume concentration, between the rhodochrosite coarse powder (calculated as containing 13% manganese) and hydrochloric acid with a pure mass ratio of 1: 0.83 leaching for 10 hours;

[0044] The solid-liquid mixture after leaching is filtered by the first filter 2, and the filter cake impurities are calcined or deeply buried; the clarified filtrate is manganese chloride tetrahydrate. The filtrate is pretreated with an appropriate amount of manganese hydroxide to obtain manganese chloride liquid and sulfuric acid with a pure mass ratio of 1: 0.98 and put into the first anticorrosion reactor 3 successively for stirring reaction. The pure mass ratio of the filtrate and calcium hyd...

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Abstract

The invention belongs to the technical field of treatment and utilization of chemical waste gases, waste water and waste residues, and particularly relates to a method for treating waste sulfuric acids by rhodochrosite to prepare high-purity manganese sulfate and hydrate thereof. The main technical scheme is that: the rhodochrosite is fully utilized to treat the waste sulfuric acids produced by the production of titanium dioxide by crushing the rhodochrosite, leaching manganese in the rhodochrosite with a hydrochloric acid and reacting leaching liquor with the waste sulfuric acids produced by the production of the titanium dioxide. On one hand, wastes are turned into wealth, environmental pollutions are treated and simultaneously the waste sulfuric acids are converted into the manganese sulfate with high economic values; and on the other hand, a plurality of products can be simultaneously co-produced in a process route, the manganese sulfate is produced and simultaneously the hydrate of the manganese hydrate is co-produced. The method ensures low production cost, high profits, great market needs and simple process and production equipment, is a relatively more practical treatment and utilization method, can create considerable economic values, eliminates the chemical waste residues and treats the environmental pollutions.

Description

technical field [0001] The invention belongs to the technical field of treatment and utilization of three chemical wastes, in particular to a method for preparing high-purity manganese sulfate and hydrate thereof by treating waste sulfuric acid with rhodochrosite. technical background [0002] The source of industrial waste sulfuric acid is mainly produced by the sulfuric acid process titanium dioxide industry, which not only discharges a large amount of waste sulfuric acid but also has a high concentration. About 10 tons of waste sulfuric acid with a concentration of 5% to 22% (mass fraction) is discharged for every ton of titanium dioxide produced. The traditional method of these waste sulfuric acids is to produce concentrated sulfuric acid by taking a concentrated cycle process after recycling; however, this method has High energy consumption, demanding material requirements, difficult separation of ferrous sulfate and enrichment of impurities during recovery and other fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10
Inventor 王嘉兴
Owner 王嘉兴
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