Method for recycling copper by-product polyaluminum chloride from acidic CuC12 waste etching solution

A technology of polyaluminum chloride and etching waste liquid, which is applied in the direction of copper chloride, copper halide, etc., can solve the problems of consumption of hydrochloric acid and alkali, high production cost, etc., achieve the effect of accelerating reaction, reducing environmental pressure, and realizing zero discharge

Inactive Publication Date: 2016-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process consumes a lot of hydrochloric acid and alkali, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 3m of etching waste liquid containing Cu 154.2g / L and HCl 1.8mol / L 3 , first press Cl - into AlCl 3 1.2 times of the theoretical amount, stir at room temperature and add aluminum ash with a metal aluminum content of about 90% in batches, continue stirring for 1 hour after all the aluminum ash is added, and perform the first filtration to obtain copper powder and a filtrate. Heat the primary filtrate to above 85°C and continue to add aluminum ash in batches. The aluminum ash to be added is no longer dissolved, and calcium oxide is added to adjust the pH of the solution to 3.6, and the second filtration is performed to obtain the second filter residue and the second filtrate. The resulting secondary filter residue is returned to the copper replacement process for continued use; the resulting secondary filtrate is evaporated and concentrated to obtain a density of 1.2 g / cm 3 Contains Al 2 o 3 11% polyaluminum chloride liquid; the obtained copper powder is washed a...

Embodiment 2

[0027] Take 2m of etching waste solution containing Cu 151.5g / L and HCl 1.9mol / L 3 , stirring and adding -40 mesh aluminum slag to replace the copper therein, until the Cu content in the solution drops to 3 Adjust the pH of the solution to 3.3, add CaO to adjust the pH of the solution to 4.3, filter, and spray-dry the filtrate to obtain Al 2 o 3 Polyaluminum chloride products with a content of up to 28%.

Embodiment 3

[0029] Take 2.5L of etching waste solution containing Cu 99.6g / L and HCl 2.1mol / L, evaporate at 106°C for 45min under normal pressure, reduce the concentration of HCl to 0.12mol / L, stir first with a liquid-solid ratio of 2:1ml / g Add the secondary filter residue obtained in Example 2, and then add aluminum scraps, stop adding aluminum after the pH of the solution rises to 2.0, continue stirring at 90°C for 1.5h, and filter to obtain copper powder and replaced liquid. The obtained copper powder is first treated with acidic CuCl 2 Wash with etching solution, then wash with water, and dry to obtain copper powder with a purity of 99.8%. 3 Contains Al 2 o 3 Up to 10.6% polyaluminum chloride liquid.

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Abstract

The invention discloses a method for recycling copper by-product polyaluminum chloride from an acidic CuC12 waste etching solution. The method is characterized in that a material containing metal aluminum is directly added into the acidic CuC12 waste etching solution to be substituted for copper in the solution; or, free hydrochloric acid in the acidic CuC12 waste etching solution is heated and evaporated at first, then, a material containing metal aluminum is added to be substituted for copper in the solution, filtration is carried out, and copper powder or copper sponge and a cementation leaching solution are obtained. The obtained copper powder is washed, dried and sold. The obtained copper sponge is washed and electrolytically refined, and cathode copper is obtained; alkaline matter is added into the obtained cementation leaching solution; and evaporation and concentration are carried out after the pH value is adjusted, a polyaluminum chloride product is obtained, the copper and chlorine in the acidic CuC12 waste etching solution are sufficiently utilized, and zero emission in the copper separation and recovery technological process is achieved. The method has the advantages of being simple in technology, low in comprehensive recovery cost, good in economic benefit and the like.

Description

technical field [0001] The invention belongs to the field of chemical metallurgy, in particular to a 2 A method for recovering copper by-product polyaluminum chloride from etching waste liquid. Background technique [0002] Acid copper chloride etchant (HCl-CuCl 2 -NaCl) is widely used in the production of inner layers of multilayer boards, printing-etching boards, and graphic printing boards because of its easy control of etching speed, large amount of dissolved copper, and high etching quality of etching solution in a stable state. of etching. The acid etching process of copper is based on NaClO 3 As an oxidizing agent, hydrochloric acid is used as a copper stripping agent and an acidity regulator, and the product is CuCl 2 and NaCl. As the etching reaction proceeds, CuCl 2 and NaCl are continuously accumulated in the etchant, resulting in the copper etching rate increasing with CuCl 2 When the concentration of Cu in the solution increases to a certain extent, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00C01G3/05
CPCC22B15/0091C01G3/05
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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