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Comprehensive treatment method of acidic etching waste liquid

An acid etching waste liquid, comprehensive treatment technology, applied in metallurgical wastewater treatment, chemical instruments and methods, heating water/sewage treatment and other directions, can solve the problems of high risk, troublesome treatment, increase the salt content of wastewater, etc. The effect of ensuring the discharge standard, improving the resource recovery rate, and increasing the distillation speed

Inactive Publication Date: 2010-08-04
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The biggest problem in the current acid etching waste treatment process is that the tail water cannot be discharged up to the standard
The method of adding alkali to neutralize residual acid does not achieve resource reuse, and increases the salt content of wastewater
The replacement method saves the most investment, but the tail water contains a large amount of salt and excessive copper ions, and the treatment is the most troublesome; the extraction method has high cost of extraction agent, large loss, and limited recovery of copper; hydrogen and chlorine gas are easily generated during diaphragm electrolysis, which is dangerous high production cost; sulfuric acid extraction and distillation method did not solve the problem of excessive copper ions in the tail water

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] will be 1m 3 The acidic etching waste liquid to be treated with a hydrochloric acid concentration of 2N and a copper ion concentration of 120g / L is pumped into the distillation kettle, 5L of hydrogen peroxide is added, and after stirring for 20 seconds, 80L of 98% concentrated sulfuric acid is added for heating and distillation, heated with saturated steam, and the temperature of the kettle is 100°C. until evaporated. Add 300L of clear water to the product storage tank in advance, and the distilled steam is absorbed by the water ejector. The vacuum pressure of the water ejector is 1kPa. After the distillation is completed, the volume of dilute hydrochloric acid becomes 1350L, and the concentration is 15%. Then add clear water to the distillation kettle while it is hot to dissolve the residue as a solution, use a high-pressure pump to inject the mother liquor into the nanofiltration membrane, concentrate and separate it under a pressure of 0.9MPa, and discharge 40L of th...

Embodiment 2

[0026] will be 1m 3 The acidic etching waste liquid to be treated with a hydrochloric acid concentration of 3N and a copper ion concentration of 140g / L is pumped into the still, and 6.5L of hydrogen peroxide is added. After stirring for 30 seconds, 100L of 98% concentrated sulfuric acid is added for heating and distillation. Electric heating is used, and the temperature of the kettle is 110°C. until evaporated. Add 250L of clean water to the product storage tank in advance, and the distilled steam is absorbed by the water ejector. The vacuum pressure of the water ejector is 2kPa. After the distillation is completed, the volume of dilute hydrochloric acid becomes 1360L, and the concentration is 17%. Then add clear water to the distillation kettle while it is hot, as a solution to dissolve the residue, select a combination of nanofiltration membrane and reverse osmosis membrane, and discharge 70L of filtrate at an operating pressure of 1.9MPa. Use distilled steam to heat, cool a...

Embodiment 3

[0028] will be 1m 3 The acidic etching waste liquid to be treated with a hydrochloric acid concentration of 4N and a copper ion concentration of 160g / L is pumped into the distillation kettle, 8L of hydrogen peroxide is added, and after stirring for 40s, 130L of 98% concentrated sulfuric acid is added for heating and distillation. Evaporate to dryness. 200L of clean water is added to the product storage tank in advance, and the distilled steam is absorbed by the water ejector. The vacuum pressure of the water ejector is 3kPa. After the distillation is completed, the volume of dilute hydrochloric acid becomes 1380L, and the concentration is 20%. Then add clear water to the distillation kettle while it is hot, as a solution to dissolve the residue, select a combination of nanofiltration membrane and reverse osmosis membrane, and discharge 100L of filtrate at an operating pressure of 1.5MPa. Use distilled steam to heat, cool and crystallize, and drench the crystal with water Wash...

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Abstract

The invention relates to a comprehensive treatment method of acidic etching waste water. Tail water treated by the existing treatment method can not conform to the standard. The method comprises the following steps: firstly adding oxydol to an acidic etching waste liquid to be treated for breaking and regeneration; then adding 98% concentrated sulfuric acid, distilling by heating, and absorbing the distilled steam with clean water to obtain dilute hydrochloric acid; dissolving residues after the distillation in a solution to generate a mother solution, throwing nano filter membranes and reverse osmosis membranes for concentration and separation, cooling and crystallizing the condensed mother solution, rinsing with water, and drying to obtain a copper sulfate crystal product. The method comprehensively uses the resources of the acidic etching waste liquid, produces the industrial dilute hydrochloric acid and copper sulfate products, ensures that the discharged waste water conform to the standard, improves the resource recovery rate of copper, and also raises the distillation speed.

Description

technical field [0001] The invention relates to a comprehensive recovery and treatment method for industrial waste liquid, in particular to a treatment method for acidic etching waste liquid. By using the method, hydrochloric acid and copper sulfate can be recovered from the acidic etching waste liquid, and discharge up to the standard can be achieved. Background technique [0002] At present, acid etching solution is mainly used in the production of single-sided printed circuit boards in China. Acidic etchant is an etchant suitable for the production of fine circuit boards. It has a rich system, and the most common one is hydrochloric acid / copper chloride system. Etching waste liquid is a complex solution system containing a variety of complex ions, containing high concentrations of copper ions and acidity, which is a hazardous waste and must be treated with special methods or technologies. At present, the following treatment methods are often used for acidic etching waste...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G3/10C01B7/01C02F1/72C02F1/44C02F1/04C02F1/22C02F103/16
Inventor 陈建军
Owner HANGZHOU DIANZI UNIV
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