Method for preparing high-purity manganese nitrate and co-generating gypsum by using waste sulfuric acid treated by rhodochrosite

A technology of combining manganese nitrate and waste sulfuric acid, applied in the directions of manganese nitrate, calcium/strontium/barium sulfate, etc., can solve the problem of high 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 still no better way to solve the problem of wa

Method used

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  • Method for preparing high-purity manganese nitrate and co-generating gypsum by using waste sulfuric acid treated by rhodochrosite
  • Method for preparing high-purity manganese nitrate and co-generating gypsum by using waste sulfuric acid treated by rhodochrosite

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Experimental program
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Effect test

Embodiment 1

[0034] Using rhodochrosite to process waste sulfuric acid to prepare high-purity manganese nitrate and produce gypsum, the preparation steps are as follows:

[0035] Step A, 800kg rhodochrosite is pulverized into 60 purpose coarse powder;

[0036] Step B, putting the rhodochrosite coarse powder into the leaching tank 1 equipped with hydrochloric acid, and leaching for 6 hours with a pure mass ratio of 1:0.43; The concentration is 15%;

[0037] Step C, filtering the solid-liquid mixture leached in step B with the first filter 2, and calcining or deeply burying the filter cake impurities;

[0038] Step D, the filtrate obtained by filtering in step C and sulfuric acid are successively dropped into the first anticorrosion reactor 3 with a pure mass ratio of 1: 0.58 to carry out stirring reaction, and the pure mass ratio of the filtrate to calcium hydroxide is according to the pure manganese chloride in the filtrate and sulfuric acid for conversion; before the filtrate is reacted...

Embodiment 2

[0046] Using rhodochrosite to process waste sulfuric acid to prepare high-purity manganese nitrate and produce gypsum, the preparation steps are as follows:

[0047] Step A, 800kg rhodochrosite is pulverized into 100 mesh coarse powder;

[0048] Step B, putting the rhodochrosite coarse powder into the leaching tank 1 equipped with hydrochloric acid, and leaching for 8 hours with a pure mass ratio of 1:0.63; The concentration is 17%;

[0049] Step C, filtering the solid-liquid mixture leached in step B with the first filter 2, and calcining or deeply burying the filter cake impurities;

[0050]Step D, the filtrate obtained by filtering in step C and sulfuric acid are successively dropped into the first anticorrosion reactor 3 with a pure mass ratio of 1:0.78 to carry out stirring reaction, and the pure mass ratio of the filtrate to calcium hydroxide is according to the pure manganese chloride in the filtrate and sulfuric acid for conversion; before the filtrate is reacted wit...

Embodiment 3

[0058] Using rhodochrosite to process waste sulfuric acid to prepare high-purity manganese nitrate and produce gypsum, the preparation steps are as follows:

[0059] Step A, 800kg rhodochrosite is pulverized into 120 purpose coarse powder;

[0060] Step B, putting the rhodochrosite coarse powder into the leaching tank 1 equipped with hydrochloric acid, and leaching for 10 hours with a pure mass ratio of 1: 1.83; wherein, the rhodochrosite coarse powder (calculated as containing 13% manganese), the volume of The concentration is 20%;

[0061] Step C, filtering the solid-liquid mixture leached in step B with the first filter 2, and calcining or deeply burying the filter cake impurities;

[0062] Step D, the filtrate obtained by filtering in step C and sulfuric acid are successively dropped into the first anticorrosion reactor 3 with a pure mass ratio of 1:0.98 to carry out stirring reaction, and the pure mass ratio of the filtrate to calcium hydroxide is according to the pure m...

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Abstract

The invention belongs to the technical field of the treatment and the utilization of chemical three wastes, in particular to a method for generating high-purity manganese nitrate and co-generating gypsum by using waste sulfuric acid treated by rhodochrosite. The invention has the main technical scheme that the method comprises the following steps of: treating waste sulfuric acid generated by producing titanium pigmen by fully utilizing the rhodochrosite; crushing the rhodochrosite and extracting manganese contained in the rhodochrosite with hydrochloric acid; making an extracting liquid react with the waste sulfuric acid generated by producing the titanium pigment; and carrying out comprehensive reaction by using nitric acid. On the one hand, the wastes are changed into the valuables and the waste sulfuric acid is converted into manganese nitrate with high economic value while the pollution to the environment is treated; and on the other hand, the gypsum is co-generated while the manganese nitrate is produced. The invention has the advantages of low production cost, high profit, high market demand and simple process and production equipment; and the method is a comparatively practical treatment and utilization method; and the considerable economic values can be created, chemical waste residues are eliminated and the pollution to the environment is governed.

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 nitrate by treating waste sulfuric acid with rhodochrosite to produce gypsum. 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 fata...

Claims

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Application Information

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IPC IPC(8): C01G45/08C01F11/46
Inventor 王嘉兴
Owner 王嘉兴
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