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Method for recovering copper from brown oxidation wastewater of printed circuit board

A printed circuit and copper recovery technology, which is applied in the field of resource recovery, can solve the problems of high reagent consumption, poor economy, secondary pollution, etc., and achieve the effect of high added value, easy realization of process parameters and equipment, and efficient recovery

Active Publication Date: 2016-05-11
广西振钢再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chemical precipitation method has problems such as large consumption of reagents and secondary pollution, and the electrolysis and oxidation methods have problems such as large energy consumption and poor economy.

Method used

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  • Method for recovering copper from brown oxidation wastewater of printed circuit board

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Under normal temperature conditions, take 2L of waste browning solution, the copper content is 30g / L, and the theoretical copper content is 60g; add 200g sodium carbonate to the browning solution, and the pH value is 6.5; then add powdered activated carbon 0.6Kg, stir the solution for 30min, fully Reaction; filter and dry the waste browning liquid to obtain the filter residue; put the filter residue powder into the vacuum pyrolysis reactor, start the vacuum pump, adjust the pressure of the vacuum reactor to 30Pa, raise the temperature of the reactor to 550°C, and perform constant temperature pyrolysis After 10 minutes, the organic matter in the filter residue is fully pyrolyzed and volatilized, and collected by condensation in the condenser; the temperature of the vacuum reactor is lowered to 250°C, and heated at a constant temperature for 30 minutes to fully react carbon and copper oxide to obtain copper powder and carbon powder. The product is taken out, washed with cl...

Embodiment 2

[0031] Under normal temperature conditions, take 1L of waste browning solution, the copper content is 30g / L, and the theoretical copper content is 30g; add 150g sodium carbonate to the browning solution, and the pH value is 6.8; then add 0.5Kg of powdered activated carbon, stir the solution for 30min, fully Reaction; filter and dry the waste browning liquid to obtain the filter residue; put the filter residue powder into the vacuum pyrolysis reactor, start the vacuum pump, adjust the pressure of the vacuum reactor to 30Pa, raise the temperature of the reactor to 600°C, and perform constant temperature pyrolysis After 10 minutes, fully pyrolyze and volatilize the organic matter in the filter residue, and condense and collect it through the condenser; reduce the temperature of the vacuum reactor to 270°C, and heat at a constant temperature for 30 minutes to fully react the carbon and copper oxide, and obtain the product of copper powder and carbon powder The product is taken out,...

Embodiment 3

[0033]Under normal temperature conditions, take 1L of waste browning solution, the copper content is 30g / L, and the theoretical copper content is 30g; add 100g sodium carbonate to the browning solution, and the pH value is 6.5; then add 0.4Kg of powdered activated carbon, stir the solution for 30min, and fully Reaction; filter and dry the waste browning liquid to obtain the filter residue; put the filter residue powder into the vacuum pyrolysis reactor, start the vacuum pump, adjust the pressure of the vacuum reactor to 30Pa, raise the temperature of the reactor to 600°C, and perform constant temperature pyrolysis After 10 minutes, the organic matter in the filter residue is fully pyrolyzed and volatilized, and condensed and collected by the condenser; the temperature of the vacuum reactor is lowered to 260°C, and heated at a constant temperature for 30 minutes to fully react carbon and copper oxide to obtain copper powder and carbon powder. The product is taken out, washed wit...

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Abstract

The invention relates to a method for recovering copper from brown oxidation wastewater of a printed circuit board, belonging to the technical field of resource recovery. The method comprises the steps of firstly, adding sodium carbonate into brown oxidation wastewater to regulate the PH value; then, adding powdered activated carbon to adsorb, filter and drying, and carrying out vacuum pyrolysis and vacuum reduction in a vacuum reactor; and next, dissolving and electrolyzing to obtain cathode copper, wherein the recovery rate of copper can be up to more than 98% so that the purification treatment of the brown oxidation wastewater is realized. According to the method, the treatment process is simple, process parameters and equipment are easily realized, the additional value is high, and the economic and environmental benefits are favorable.

Description

Technical field: [0001] The invention belongs to the technical field of resource recovery, and in particular relates to a method for recovering copper from browning waste liquid of printed circuit boards. technical background: [0002] With the rapid development of the printed circuit board (PCB) industry and market demand, PCB companies are also striving to improve efficiency, reduce costs, improve the environment, and adapt to The demand for multi-variety and small-batch production, but the traditional blackening process is difficult to achieve horizontal production. The ability to make thin plates is poor, the process is long, the process control is complicated, the operating environment is poor, the cost of sewage treatment is high, and the development is limited. Although the black oxidation technology can enhance the bonding force between the inner layers, there are still problems. During the drilling process of multi-layer boards, high mechanical stress causes micro-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C25C1/12
CPCC22B7/00C22B7/006C22B15/0091C25C1/12Y02P10/20
Inventor 周益辉
Owner 广西振钢再生资源有限公司
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