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Combined treatment method of copper-containing sludge and copper-containing etching waste liquid

A combined processing and copper etching technology, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of high acid consumption cost and high disposal cost, so as to protect the environment, reduce acid and alkali consumption, and reduce The effect of production costs

Pending Publication Date: 2021-06-11
HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional sludge treatment process generally adopts sulfuric acid leaching, the cost of acid consumption is relatively high, and the residual acid in the subsequent feed liquid still has to be neutralized, and the disposal cost remains high

Method used

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  • Combined treatment method of copper-containing sludge and copper-containing etching waste liquid
  • Combined treatment method of copper-containing sludge and copper-containing etching waste liquid
  • Combined treatment method of copper-containing sludge and copper-containing etching waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Using acidic copper-containing etching waste liquid and copper-containing sludge produced by a circuit board factory as raw materials: the concentration of copper chloride in the acidic copper-containing etching waste liquid is 15.28%, converted into Cu 2+ Concentration is 72.44g / L, H + The concentration is 1.81mol / L; the dry base copper content of the copper-containing sludge is 12.94%, and the moisture content is 68.5%.

[0048] A kind of combined treatment method of copper-containing sludge and copper-containing etching waste liquid, such as figure 1 As shown, the following steps are involved:

[0049] (1) Leaching: Weigh 100g of the above-mentioned acidic copper-containing etching waste liquid and 200g of the above-mentioned copper-containing sludge to make pulp together, add water to adjust the solid-liquid ratio to 1:7, add concentrated sulfuric acid with an industrial mass concentration of 98%, and adjust the pH of the slurry To 1.8, the final acid consumption ...

Embodiment 2

[0062] Using acidic copper-containing etching waste liquid and copper-containing sludge produced by a circuit board factory as raw materials: the concentration of copper chloride in the acidic copper-containing etching waste liquid is 15.28%, converted into Cu 2+ Concentration is 72.44g / L, H + The concentration is 1.81mol / L; the dry base copper content of the copper-containing sludge is 12.94%, and the moisture content is 68.5%.

[0063] A method for joint treatment of copper-containing sludge and copper-containing etching waste liquid, comprising the following steps:

[0064] (1) Leaching: Weigh 10kg of the above-mentioned acidic copper-containing etching waste liquid and 20kg of the above-mentioned copper-containing sludge to make pulp together, add water to adjust the solid-liquid ratio to 1:7, add concentrated sulfuric acid with an industrial mass concentration of 98%, and adjust the pH of the slurry to 1.85, the final acid consumption is 2.18kg, the reaction is 4-6h, and...

Embodiment 3

[0075] The concentration of copper chloride in the acidic copper-containing etching waste liquid is 15.28%, converted into Cu 2+ Concentration is 72.44g / L, H + The concentration is 1.81mol / L; the dry base copper content of the copper-containing sludge is 12.94%, and the moisture content is 68.5%.

[0076] A method for joint treatment of copper-containing sludge and copper-containing etching waste liquid, comprising the following steps:

[0077] (1) Leaching: Take 2t of the above-mentioned acidic copper-containing etching waste liquid and 4t of the above-mentioned copper-containing sludge to make pulp together, add water to adjust the solid-liquid ratio to 1:8, add concentrated sulfuric acid with an industrial mass concentration of 98%, and adjust the pH of the slurry to 1.78, the final acid consumption is 385Kg, the reaction is 6h, and the solid-liquid separation obtains leaching residue and copper-containing feed liquid.

[0078] (2) Washing and neutralization: add water to...

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Abstract

The invention discloses a combined treatment method of copper-containing sludge and copper-containing etching waste liquid. The combined treatment method comprises the following steps that the acidic copper-containing etching waste liquid and the copper-containing sludge are pulped together, the solid-to-liquid ratio is adjusted by using water, the pH value of the slurry is adjusted to be acidic by using concentrated sulfuric acid, reacting is carried out, and filtering is carried out to obtain copper-containing feed liquid and leaching residues; washing and neutralizing are carried out on the leaching residues, and tailings are obtained; and copper extraction, organic phase washing and copper reverse extraction are sequentially carried out on the copper-containing feed liquid, copper electrodeposition is carried out on a solution obtained through copper reverse extraction, and cathode copper is obtained. According to the method, acid-base neutralization reaction is utilized, so that the acid-base consumption is greatly reduced, and the production cost is reduced; the copper content of the final leaching residues is lower than 0.05%, and the final leaching residues can be used as common solid waste; after the copper extraction process, loaded organic phase washing is carried out, in the process of washing with water, a large number of chloride ions and iron ions are carried out in washing liquid, and therefore the chloride ions and the iron ions transferred into strip liquor are remarkably reduced, the copper electrodeposition efficiency is improved, and the purity of a cathode copper product is increased.

Description

technical field [0001] The invention belongs to the technical field of harmless resource utilization of copper-containing hazardous waste, and in particular relates to a combined treatment method of copper-containing sludge and copper-containing etching waste liquid. Background technique [0002] Printed circuit board (referred to as PCB) is an important part of electronic products. As the electronics industry is growing day by day in recent years, it has driven the rapid development of the PCB industry. In the PCB production process, etching copper is the most important link. This process is mainly to use etching solution to remove the unnecessary part of the copper foil on the copper clad substrate, and keep the required part of the copper foil to form the required circuit pattern. The etching process is very important in the PCB manufacturing process, and controlling the quality of the etching process is the key to ensuring the quality and performance of the entire PCB. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C23F1/46C22B7/00C22B3/30C22B15/00
CPCC25C1/12C23F1/46C22B7/007C22B15/0086Y02P10/20
Inventor 李凯赵邵安秦荣钢
Owner HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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