Method for recovering copper from alkaline etching waste liquid and recycling alkaline etching liquid

A technology of etching waste liquid and a recovery method, which is applied in the field of recycling copper from alkaline etching waste liquid and alkaline etching liquid, can solve the problems of low efficiency, achieve the effects of reducing use cost, good catalytic effect, and reducing energy consumption

Inactive Publication Date: 2011-04-20
FUQING BRANCH OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, when using hydrazine hydrate to reduce and recover copper in the alkaline etching waste liquid, the copper content in the alkaline etching waste liquid after treatment is above 100g / L, and the efficiency is low.

Method used

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  • Method for recovering copper from alkaline etching waste liquid and recycling alkaline etching liquid
  • Method for recovering copper from alkaline etching waste liquid and recycling alkaline etching liquid
  • Method for recovering copper from alkaline etching waste liquid and recycling alkaline etching liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Put 1 liter of waste alkaline etching solution in a reaction vessel, heat to 100°C, add 175 ml of 40% hydrazine hydrate dropwise, add 1.0 ml of palladium chloride solution containing 1 mg / mL palladium metal, and keep the reaction The temperature was 100°C, and the reaction time was 35 minutes.

[0032] 2. Quickly filter after the reaction to obtain the precipitate and filtrate. The precipitate is copper powder precipitation with a purity of 99.2%. The obtained filtrate has a copper content of 40 g / L and a pH of 8.5, and the filtrate can be reused to prepare a new etching solution.

Embodiment 1-1

[0034] 1. Put 1 liter of waste alkaline etching solution in a reaction vessel, heat to 100°C, add 175 ml of 40% hydrazine hydrate dropwise, add 1.0 ml of palladium chloride solution containing 1 mg / mL palladium metal, and keep the reaction The temperature was 100°C, and the reaction time was 35 minutes.

[0035] 2. Quickly filter after the reaction to obtain the precipitate and filtrate. The precipitate was washed twice with a small amount of 200g / L ammonium chloride solution to obtain the copper powder precipitate and washing liquid, and the filtrate and washing liquid were combined to obtain filtrate A.

[0036] 3. The precipitated copper powder was washed with 2% dilute sulfuric acid and water, and dried at 105° C. to obtain 115 g of copper powder and filtrate B at the same time. Hydrazine hydrate consumption (calculated per gram of copper powder): 1.52ml / g

[0037] 4. The obtained filtrate A has a copper content of 40g / L, a pH of 8.0, and an oxidation-reduction potential...

Embodiment 2

[0039] 1. Put 1 liter of waste alkaline etching solution in a reaction vessel, heat to 100°C, add 175 ml of 40% hydrazine hydrate dropwise, add 10.0 ml of palladium chloride solution containing 1 mg / mL palladium metal, and keep the reaction The temperature was 100°C, and the reaction time was 35 minutes.

[0040] 2. Quickly filter after the reaction to obtain the precipitate and filtrate. The precipitate was washed twice with a small amount of 200g / L ammonium chloride solution to obtain the copper powder precipitate and washing liquid, and the filtrate and washing liquid were combined to obtain filtrate A.

[0041] 3. The precipitated copper powder was washed with 2% dilute sulfuric acid and water, and dried at 105° C. to obtain 118 g of copper powder and filtrate B at the same time. Hydrazine hydrate consumption (calculated per gram of copper powder) is: 1.48ml / g.

[0042] 4. The obtained filtrate A has a copper content of 39g / L, a pH of 8.0, and an oxidation-reduction pote...

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Abstract

The invention discloses a method for recovering copper from alkaline etching waste liquid and recycling the alkaline etching liquid, comprising the step of adding a hydrazine hydrate reducing agent and a catalyst into the alkaline etching waste liquid to recover copper powder, wherein the alkaline etching waste liquid can be recycled after the copper powder is recovered. The invention has the optimum conditions of: placing the alkaline etching waste liquid into a reactor; adding hydrazine hydrate with mass percent concentration of 40 percent according to added quantity of 160-200mL / L; adding a solution of various salts of ruthenium, palladium, nickel and cobalt as the catalyst with added quantity of 0.01-0.2g / L (metered by the masses of the ruthenium, the palladium, the nickel and the cobalt), reacting for 30-35 minutes at temperature between 70DEG C and 100DEG C; and separating to obtain the copper powder. The invention has the beneficial effect that after the copper is recovered from the alkaline etching waste liquid, the alkaline etching waste liquid can be regenerated and recycled, therefore, various resources in the alkaline etching waste liquid can be used fully, and the etching cost of a printing plate and the discharge of pollutants can be reduced.

Description

Technical field: [0001] The invention relates to a method for recovering copper from alkaline etching waste liquid and alkaline etching liquid. Background technique: [0002] The alkaline etching waste liquid contains copper ammonium complex, ammonium chloride and ammonia water, and the copper content can reach 120-170g / L. If it is discharged directly, it will bring serious harm to the environment. In the production of printed boards, it is necessary to recycle the etching waste liquid to make full use of resources, reduce costs, and reduce pollutant emissions. At present, the commonly used etching waste liquid treatment methods are mainly neutralization (chemical) precipitation method, flocculation precipitation method, electrolysis method, etc.; neutralization precipitation method and flocculation precipitation method are simple in processing alkaline etching waste liquid, and the investment is small, but they cannot be used for waste. Inorganic and organic matter such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C23F1/46C23F1/32
Inventor 刘华陈盛郑建美
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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