Method for recovering copper from brownification waste liquid

A technology for recovering copper and waste liquid, applied in the improvement of process efficiency, photography process, instruments, etc., can solve problems such as affecting the reaction efficiency, and achieve the effects of high current efficiency, reduction of heavy metal pollution, and efficient recovery

Active Publication Date: 2014-01-15
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relationship between the electric drive and the concentration difference in the electrocatalytic process affects the overall reaction efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At 30°C, take 500L of browning solution, the copper content is 25g / L, the theoretical copper content is 12.5kg, add 2.5kg sodium hydroxide to the 500L browning solution, the pH is 2, filter the solution, add 5g of mercaptoimidazole Sodium sulfonate, in an insoluble titanium-coated iridium-tantalum anode and titanium cathode electrolyzer at a current density of 220A / m 2 Electrolysis was carried out under the conditions, the copper on the cathode was peeled off, dried and weighed, the actual output of copper obtained was 12.3kg, and the current efficiency at this time was 98.4%.

Embodiment 2

[0027] When the temperature is 35°C, take 1000L of browning solution, the copper content is 30g / L, the theoretical copper content is 30kg, add 5kg of sodium carbonate to the browning solution, the pH is 2.5, filter the solution, add 10g of 3-sulfur-isothiourea Inner salt of propanesulfonic acid, in an insoluble titanium-coated iridium-tantalum anode and titanium cathode electrolyzer with a current density of 250A / m 2 , After electrolysis, the actual output of copper obtained is 29.6kg, and the current efficiency at this time is 98.6%.

Embodiment 3

[0029] When the temperature is 40°C, take 2000L of browning solution, the copper content is 35g / L, the theoretical copper content is 70kg, add 10kg of ammonia water to the browning solution, the pH is 2.3, filter the solution, add 15g of thiazolinyl dithiopropane Sodium sulfonate, in an insoluble titanium-coated iridium-tantalum anode and titanium cathode electrolyzer at a current density of 280A / m 2 , After electrolysis, the actual output of copper obtained is 69.3kg, and the current efficiency at this time is 99%.

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PUM

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Abstract

The invention discloses a method for recovering copper from brownification waste liquid. The method comprises the following steps: within the temperature of 30 to 100 DEG C, adding an alkaline substance in the brownification waste liquid, controlling the adding amount of the alkaline substance to control the pH value of the waste liquid to be 2-3, then filtering the liquid, adding an electrolytic additive into the filtrate, and carrying out electrolysis at 30-60 DEG C. Through the adoption of the method, copper can be effectively recovered from the brownification waste liquid to reduce waste metal pollution. According to the invention, the copper recovery rate is up to 99%, and after liquid is processed, the content of copper in the waste liquid is less than 100 mg / L. After recovery of copper, the follow-up processing cost for the organic waste in the brownification waste liquid is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and clean production, and in particular relates to a method for recovering copper from browning waste liquid. Background technique [0002] A printed circuit board (PCB) is a platform that ensures the electrical interconnection of various electronic components. The polymer substrate used in PCB can be epoxy resin reinforced with glass fiber cloth, or polymers such as phenol and polyamide, or other resins. By covering a thin layer of copper on one or both sides of the polymer substrate, and covering the copper surface with photoresist, after exposure, development, and etching, a circuit pattern can be formed on the copper surface, so that one-sided or Double-sided circuit board. Since the density of electrical interconnection provided by single and double panels is very limited, multilayer circuit boards that are currently widely used have been developed. The above-mentioned double-sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12
CPCY02P10/20
Inventor 周磊周晓诚黄剑峰李娟李鹏史学峰赵新星
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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