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Method for recycling zinc in galvanized scrap steel and zinc-containing material

A technology of scrap iron and steel and materials, applied in the direction of zinc oxide/hydroxide, iron oxide, alkali metal chloride, etc., can solve the problems of waste of resources, increase the concentration of smoke and dust emissions, increase energy consumption, etc., to avoid waste of resources , avoid waste, low cost effect

Active Publication Date: 2017-12-22
衡水市源峰资源再生科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of waste is processed and sold directly to steel mills. During the smelting process, it not only increases the concentration of smoke and dust emissions, but also increases energy consumption. More importantly, it affects the quality of steel products.
Due to the constraints that cannot be mastered by key technologies, these zinc resources cannot be effectively utilized, resulting in undue waste of resources
It also has a negative impact on environmental protection

Method used

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  • Method for recycling zinc in galvanized scrap steel and zinc-containing material
  • Method for recycling zinc in galvanized scrap steel and zinc-containing material
  • Method for recycling zinc in galvanized scrap steel and zinc-containing material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The method for recovering and reusing zinc in galvanized scrap iron and steel and zinc-containing materials comprises the following steps:

[0030] (1) Pickling: The purchased galvanized scrap iron and steel and zinc-containing materials are carefully sorted and processed, and then put into the reaction pool, and dilute hydrochloric acid (composed of 5 parts of chlorine 1 part of 32 (wt)% hydrochloric acid obtained by diluting 1 part of sodium chloride aqueous solution) is pickled to obtain mixed solution A and scrap iron and steel containing iron ions and zinc ions;

[0031] The main chemical reaction equation involved in this step is: Zn+2HCl=ZnCl 2 +H 2 ↑; Fe+2HCl=FeCl 2 +H 2↑;

[0032] (2) Oxidation and impurity removal: add hydrogen peroxide to the mixed solution A for oxidation, add sodium hydroxide to adjust the pH of the solution to 4.5, under this pH condition, zinc hydroxide precipitation will not occur, but only other impurities can be precipitated. In t...

Embodiment 2

[0044] The method of Example 2 is basically the same as that of Example 1, except that the drying condition of step (5) is: drying at 125°C for 1 hour; the thermal decomposition condition of step (6) is: zinc carbonate, roasting at 750°C for 1 hour; zinc hydroxide , 500 ℃ roasting 1h.

Embodiment 3

[0046] The method of Example 3 is basically the same as that of Example 1, only the drying condition of step (5) is: drying at 110°C for 1.5h; the thermal decomposition condition of step (6) is: zinc carbonate, roasting at 750°C for 2h; Zinc, baked at 400°C for 1.5h.

[0047] like figure 1 As shown, the technical process of the present invention, through purchasing, sorting, packing, pickling, obtains zinc-containing solution and clean steel, and the clean steel is processed for sale; the zinc-containing solution continues to remove impurities, press filter, and separates the Iron is for sale, or ferric hydroxide is further processed to obtain iron oxide for sale; zinc-containing solution continues to precipitate and separate to obtain zinc hydroxide or zinc carbonate; zinc hydroxide is air-dried and processed for sale; or dried The final zinc hydroxide is roasted to obtain zinc oxide, which is machined and processed for sale; zinc carbonate is air-dried and machined for sale...

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PUM

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Abstract

The invention discloses a method for recycling zinc in galvanized scrap steel and a zinc-containing material. The method comprises the following steps: firstly carrying out acid pickling on the galvanized scrap steel and the zinc-containing material, adding hydrogen peroxide and oxidizing, and adding strong base and removing impurities; adding a sodium carbonate solution and separating out zinc carbonate; adding a sodium hydroxide solution, and separating out zinc hydroxide; and roasting and processing the separated out zinc carbonate or zinc hydroxide to obtain high-purity active zinc oxide, wherein a sodium chloride solution can be recycled and also can be further processed to obtain industrial grade sodium chloride. The recycling method disclosed by the invention is simple in operation technology, no harmful chemical reagent is added, a galvanization layer of the scrap steel and a waste zinc-containing material are changed into things of value from waste materials, intermediate products can be recycled respectively, economization and environmental protection are realized, and the recycled zinc oxide is good in activity, high in purity, low in cost and applicable to popularization and application.

Description

technical field [0001] The invention specifically relates to a method for recovering and reusing zinc in galvanized scrap iron and steel and zinc-containing materials. Background technique [0002] Zinc oxide is an oxide of zinc, insoluble in water but soluble in acid and strong alkali. Zinc oxide is a commonly used chemical additive, widely used in the production of plastics, silicate products, synthetic rubber, lubricants, paint coatings, ointments, adhesives, food, batteries, flame retardants and other products. Zinc oxide has a large energy band gap and exciton binding energy, high transparency, and excellent room temperature light-emitting performance. It is used in liquid crystal displays, thin-film transistors, and light-emitting diodes in the semiconductor field. In addition, microparticles of zinc oxide, as a nanomaterial, have also begun to play a role in related fields. [0003] Since the French applied hot-dip galvanizing to industry in the 1830s, it has a hist...

Claims

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Application Information

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IPC IPC(8): C01G9/02C01G49/06C01D3/04C22B3/00C22B7/00C22B19/30
CPCC01D3/04C01G9/02C01G49/06C01P2006/80C22B7/007C22B19/22C22B19/30Y02P10/20
Inventor 刘晓凯
Owner 衡水市源峰资源再生科技有限公司