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Technical method for handling waste etching liquid quickly and efficiently

An etchant and high-efficiency technology, applied in the field of rapid and efficient disposal of waste etchant, can solve the problems of violent reaction, potential safety hazards, and high risk of safe disposal

Inactive Publication Date: 2019-09-20
安徽浩悦环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of packaging, temporary storage, collection, and disposal, there are great safety hazards, especially in the neutralization disposal, the reaction is violent, and a large amount of heat and gas are generated. If the reaction is not properly controlled during the reaction process, it will cause flooding and jetting. Safe handling is extremely risky

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a) After mixing 10 ml of waste etching solution I with an acidity of 25.8 mol / L and a hydrogen peroxide content of 1.5% (mass fraction) and 0.1 kg of chromium-containing waste residue with a hexavalent chromium content of 9.82 g / kg, leave it for 24 hours to obtain mixture A;

[0018] b) Add 10 ml of waste etching solution II with a hydrogen peroxide concentration of 8.2 mol / L to mixture A, and stir for 10 minutes to form mixture B;

[0019] c) Mix mixture B and 0.3kg incineration fly ash evenly, and then add 0.02kg cement to mix and solidify.

[0020] The leaching test was carried out on the cured product, the leaching solution: pH: 9.23, the total chromium of heavy metals: 1.55mg / L, the hexavalent chromium content was 0.32mg / L; the hexavalent chromium content was less than 0.5mg / L, which met the landfill standard.

Embodiment 2

[0022] a) After mixing 15 ml of waste etching solution I with an acidity of 25.8 mol / L and a hydrogen peroxide content of 1.5% (mass fraction) and 0.1 L of chromium-containing waste liquid with a hexavalent chromium content of 25 g / L, leave it for 24 hours to obtain mixture A;

[0023] b) Add 15ml of waste etching solution II with a hydrogen peroxide concentration of 8.2mol / L to mixture A, and stir for 10 minutes to form mixture B;

[0024] c) Mix mixture B and 0.3kg incineration fly ash evenly, and then add 0.02kg cement to mix and solidify.

[0025] Dissolution test was carried out on the cured product, leachate: pH: 9.45, total chromium of heavy metals: 1.32mg / L, hexavalent chromium content 0.25mg / L; hexavalent chromium content is less than 0.5mg / L, which meets the landfill standard.

Embodiment 3

[0027] a) After mixing 10ml of waste etching solution I with an acidity of 25.8mol / L and a hydrogen peroxide content of 4.5% (mass fraction) and 0.1kg of chromium-containing waste residue with a hexavalent chromium content of 9.82g / kg, leave it for 24 hours to obtain mixture A;

[0028] b) Add 7.5 ml of waste etching solution II with a hydrogen peroxide concentration of 8.2 mol / L to mixture A, and stir for 10 minutes to form mixture B;

[0029] c) Mix mixture B and 0.3kg incineration fly ash evenly, and then add 0.02kg cement to mix and solidify.

[0030] Dissolution test was carried out on the cured product, leachate: pH: 9.56, total chromium of heavy metals: 0.98mg / L, hexavalent chromium content 0.36mg / L; hexavalent chromium content is less than 0.5mg / L, which meets the landfill standard.

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PUM

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Abstract

The invention belongs to the technical field of waste water treatment, and particularly relates to a method for handling waste etching liquid quickly and efficiently. Waste etching liquid I, waste etching liquid II and chromium-containing waste are handled jointly; the waste etching liquid I is the mixed waste liquid of concentrated sulfuric acid and hydrogen peroxide solutions; and the waste etching liquid II is high concentration hydrogen peroxide waste solutions. With the above method, by taking advantage of the strong acidity of the waste etching liquid I and the weak reduction of the high concentration hydrogen peroxide solutions in the waste etching liquid II, chromate (with strong oxidizability under the acidic condition) existing in the form of hexavalent chromium in the chromium-containing waste is reduced to trivalent chromium; the high efficiency reaction is achieved, and the waste etching liquid is handled with the waste; and products have no secondary pollution to environment.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to a technical method for rapidly and efficiently disposing of waste etching solution. Background technique [0002] Heavy industry is the main source of hazardous waste in my country, and the output of waste acid ranks among the top three in the amount of industrial hazardous waste, accounting for 21%, and is dominated by inorganic acids such as hydrochloric acid, sulfuric acid, and nitric acid. Taking waste sulfuric acid as an example, it mainly comes from the production of nitration, sulfonation, alkylation and other products of organic matter, as well as petroleum refining, chemical fiber industry, military industry, etc. According to the research of China Chemical Industry Information Center, in my country's waste acid, inorganic waste sulfuric acid accounts for about 35%, organic waste sulfuric acid accounts for about 65%, waste sulfuric acid with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 吴东亮吴卫林胡长江项艳郭鹏飞余端王振宇洪骏
Owner 安徽浩悦环境科技股份有限公司
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