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Method for preparing high-purity zinc hydroxide and zinc white from filter residues discharged during producing sodium hydrosulfite

A technology of zinc hydroxide and hydrosulfite, applied in the direction of zinc oxide/zinc hydroxide, solid waste removal, etc., can solve the problems of not dealing with hydrosulfite and slag, not producing high-purity zinc hydroxide and zinc white, etc.

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

At present, there is no good method for dealing with sodium hydrosulfide residue, and there is no report on the method of manufacturing high-purity zinc hydroxide and zinc white from sodium hydrosulfite residue

Method used

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  • Method for preparing high-purity zinc hydroxide and zinc white from filter residues discharged during producing sodium hydrosulfite
  • Method for preparing high-purity zinc hydroxide and zinc white from filter residues discharged during producing sodium hydrosulfite

Examples

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Effect test

Embodiment 1

[0027] A method for manufacturing high-purity zinc hydroxide and zinc white with hydrosulfate slag, the preparation steps are as follows:

[0028] Step A, drop into the first anti-corrosion reactor 1 successively with pure mass ratio 1: 0.92 to carry out agitation reaction with the hydrosulfite filter that has been converted and the ammonia-alkali waste liquid that contains calcium chloride, (wherein calculate by pure 500kg hydrogen oxidation Calculation of zinc, wherein the water content is 40%, and the side pure zinc hydroxide is 300kg) reacts to obtain calcium hydroxide solid and zinc chloride liquid, and the described hydrosulfite is converted according to pure zinc hydroxide, and the ammonia-alkali waste liquid case is pure Calcium chloride is converted;

[0029] Step B, the reaction mixture obtained in the step A is filtered with the first filter 2, the filtrate is transferred in the first reactor 3, then in the first reactor 3, drop into zinc hydroxide to remove impurit...

Embodiment 2

[0036] A method for manufacturing high-purity zinc hydroxide and zinc white with hydrosulfate slag, the preparation steps are as follows:

[0037] A method for manufacturing high-purity zinc hydroxide and zinc white with sodium hydrosulfate slag, the preparation steps are as follows:

[0038] Step A, put the converted hydrosulfite filter and the ammonia-alkali waste liquid containing calcium chloride into the first corrosion-resistant reactor 1 successively with a pure mass ratio of 1: 1.12 to carry out stirring reaction, (wherein calculate by pure 500kg hydrogen oxidation Calculation of zinc, wherein the moisture content is 40%, and the side pure zinc hydroxide is 300kg), the reaction obtains calcium hydroxide solid and zinc chloride liquid, and the described sodium hydrochloride is converted according to pure zinc hydroxide, and the ammonia-alkali waste liquid case Pure calcium chloride is converted;

[0039] Step B, the reaction mixture obtained in the step A is filtered w...

Embodiment 3

[0046] A method for manufacturing high-purity zinc hydroxide and zinc white with hydrosulfate slag, the preparation steps are as follows:

[0047] Step A, drop into the first anti-corrosion reactor 1 successively with pure mass ratio 1: 1.32 to carry out agitation reaction with the ammonia-alkali waste liquid that converted good sodium hydrochloride filter and containing calcium chloride, (wherein calculate by pure 500kg hydrogen oxidation Calculation of zinc, wherein the moisture content is 40%, and the side pure zinc hydroxide is 300kg), the reaction obtains calcium hydroxide solid and zinc chloride liquid, and the described sodium hydrochloride is converted according to pure zinc hydroxide, and the ammonia-alkali waste liquid case Pure calcium chloride is converted;

[0048] Step B, the reaction mixture obtained in the step A is filtered with the first filter 2, the filtrate is transferred in the first reactor 3, then in the first reactor 3, drop into zinc hydroxide to remo...

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Abstract

The invention belongs to the technical field of treatment of the three wastes in the chemical industry and particularly provides a method for preparing high-purity zinc hydroxide and zinc white from filter residues discharged during producing sodium hydrosulfite. The main technical scheme is as follows: ensuring the converted sodium hydrosulfite and calcium chloride to react, then filtering the reactants, respectively purifying the filter cakes and the filtrate, then ensuring the purified filter cakes and filtrate to react, then filtering the reactants to obtain the zinc hydroxide filter cakes and the calcium chloride filtrate, drying, grinding, carrying out weight checking and packaging the filter cakes to obtain the high-purity zinc hydroxide products and finally sending the zinc hydroxide to a calcining furnace to be calcined to obtain the zinc white. By adopting the method, the high-purity zinc hydroxide is prepared from filter residues discharged during producing sodium hydrosulfite on the one hand, and meanwhile, zinc white is co-produced on the other hand. The method has the advantages of low production cost, high profit, high market demand and simple process and production equipment and is a more practical treatment and utilization method. By adopting the method, considerable economic value can be created, and the waste residues in the chemical industry are removed and the environmental pollution is controlled.

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 manufacturing high-purity zinc hydroxide and zinc white by using sodium hydrosulfite slag. technical background [0002] Sodium hydrosulfite is the common name for sodium dithionite. The production of sodium hydrosulfite by the zinc powder method is to add sulfur dioxide into the zinc powder suspension, and then undergo double decomposition reaction with sodium hydroxide, filter, salt out, dehydrate, and dry to obtain the finished product. The production process of hydrosulfite needs to be discharged after pressure filtration A large amount of zinc hydroxide waste filter residue; and the accumulation of zinc hydroxide residue is very large, and the filter residue is a strong alkaline substance, which not only has a great corrosion and alkaline solidification of the land, but also is a white dust blown by the wind. is suffoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B09B3/00
Inventor 王嘉兴
Owner 王嘉兴
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