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Method for regenerating and recycling waste etching solution in stainless steel etching production line

A technology of etching waste liquid and production line, which is applied in the field of regeneration of acidic ferric chloride etching waste liquid, can solve the problems of difficult online renewal, regeneration and recycling, low production efficiency, and large safety hazards, etc., and achieve long-term recycling , The effect of prolonging the service life and fast regeneration speed

Inactive Publication Date: 2015-06-17
南通南京大学材料工程技术研究院 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This intermittent production method is not only low in production efficiency, but the factory also needs to arrange a large number of places to stack etching liquid and etching waste liquid, which poses a great safety hazard
Stainless steel decorative material enterprises generally dispose of etching waste liquid by private discharge or free recycling by manufacturers, causing environmental pollution and waste of resources
However, the existing methods for regeneration of etching solution (see patents CN02116014.7, CN200310120087.8, CN200810065306.X) are complex and costly, and it is difficult to realize online renewal, regeneration and recycling in industrial production

Method used

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  • Method for regenerating and recycling waste etching solution in stainless steel etching production line

Examples

Experimental program
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Effect test

Embodiment 1

[0016] At a constant temperature of 40°C, add 100kg of hydrogen peroxide with a mass percentage concentration of 30% to the circulating 1000kg etching waste liquid in a small number of times, and then add 180kg of industrial hydrochloric acid with a mass percentage concentration of 30-37%, keeping The etchant can be regenerated by circulating the etchant for 10 minutes.

Embodiment 2

[0018] At a constant temperature of 35°C, add 35kg of potassium permanganate to the 1000kg of circulating etching waste liquid in a small amount and several times until it is completely dissolved, and then add 170kg of industrial hydrochloric acid with a concentration of 30-37% by mass to maintain etching The etching solution can be regenerated after the liquid circulates for 10 minutes. Chemically pure hydrochloric acid is of course better.

Embodiment 3

[0020] At a constant temperature of 40°C, add 20kg of sodium chlorate to 1000kg of etching waste solution in a small amount for several times until completely dissolved, then add 120kg of industrial hydrochloric acid with a concentration of 30-37% by mass, and keep stirring the etching solution for 10 minutes The regeneration of the etchant can be completed.

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Abstract

The invention provides a method for regenerating and recycling waste etching solution in a stainless steel etching production line. The method comprises the following steps in sequence: adding 1 to 15% of oxidant based on the weight of the waste solution to the waste etching solution or the circular flowing waste etching solution; adding 5 to 25% of technical hydrochloric acid based on the weight of the waste solution; and keeping the waste etching solution in stirring or circular flowing for some time, thus accomplishing the regeneration of the waste solution. According to the method, the oxidant is especially added at two to six times. The method is simple and easy for regenerating and recycling the waste etching stainless steel column. By adopting the method, the etching efficiency of the waste etching stainless steel solution can be recovered into a new liquid level, and the purposes of regenerating and recycling are realized; ferric trichloride is not added in the method; a cylinder is not needed to be replaced; and the method is high in regeneration speed, simple in operation and low in cost, and can realize the long-term recycling of the waste etching stainless steel solution.

Description

technical field [0001] The invention relates to a method for regenerating stainless steel etching waste liquid, in particular to a simple method for regenerating acidic ferric chloride etching waste liquid in the production process of stainless steel etching plates. Background technique [0002] Stainless steel etching technology is widely used in stainless steel printing and engraving. Acidic ferric chloride etching solution has long been the first choice in the production process of stainless steel etching decorative panels because of its low price, stable corrosion efficiency and no harmful and flammable gases. In the solution of acidic ferric chloride, ferric iron reacts with iron in stainless steel to form ferrous iron. As the reaction proceeds, the concentration of ferric iron in the etching solution decreases continuously, the concentration of ferrous iron increases continuously, the oxidation-reduction potential decreases continuously, and the corrosion efficiency d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/46
Inventor 陆洪彬唐伟高扬之孟祥康冯春霞朱善忠桑志宏黄立新
Owner 南通南京大学材料工程技术研究院
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