Electroless Copper Plating Waste Solution Treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The electroless copper plating waste solution has a low copper recovery rate, low copper ion removal rate, and substandard waste solution treatment indices, posing challenges in resourceful utilization and environmental sustainability.
Innovation Solution
An online resourceful treatment method involving autocatalytic reaction, three-dimensional electrolysis, chemical precipitation, and membrane separation, utilizing a copper catalyst composed of nano copper, cerium oxide, and carbon black, with electromagnetic oscillation and specific pH adjustments to enhance copper recovery and wastewater purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If copper sulfide precipitation method is used to recycle copper from electroless copper plating waste solution, then copper can be recovered, but the value of copper sulfide is low and hydrogen sulfide overflow risk occurs
Solution Approach 1:
The patent changes the chemical reaction parameters by adjusting pH to 13-14 and temperature to 60-70°C, transforming the precipitation product from copper sulfide to copper simple substances through autocatalytic reduction reaction. This parameter change eliminates hydrogen sulfide overflow risk while improving copper recovery value
Solution Approach 2:
The patent converts the harmful copper ions in waste solution into valuable copper simple substances through autocatalytic reduction. The copper catalyst promotes the transformation of copper ions into recoverable copper metal, turning a waste problem into a resource recovery opportunity
2Loss of substance
If prior art method is used for copper recovery, then copper can be obtained, but copper-rich sediment contains many impurities requiring further purification
Solution Approach 1:
The patent divides the copper recovery process into multiple stages: autocatalytic reduction to obtain copper simple substances, filtration to separate copper from solution, and membrane separation for final purification. Each stage addresses specific impurity removal needs, achieving high purity copper recovery
Solution Approach 2:
The patent performs preliminary autocatalytic reduction to convert copper ions into copper simple substances before filtration. This preliminary action separates the majority of copper from impurities in the waste solution, making subsequent purification steps more effective
3Loss of substance
If electroless copper plating waste solution is only recycled without purification, then copper can be recovered, but the treated wastewater cannot meet national discharge standards
Solution Approach 1:
The patent designs a multi-functional treatment system that simultaneously achieves copper recovery and wastewater purification. The autocatalytic reactor recovers copper while removing copper ions, and the membrane separation unit further purifies both the copper product and the wastewater, enabling dual objectives to be met
Solution Approach 2:
The patent implements continuous circulation of treated wastewater back to the autocatalytic reactor, maintaining continuous copper ion removal. This continuous action ensures that copper recovery and wastewater treatment occur simultaneously and continuously, meeting both recovery rate and discharge standard requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves a copper recovery rate of above 95% and meets national discharge standards for treated wastewater, effectively improving copper ion removal and water quality.
Implementation Method 1
adding a copper catalyst according to a certain amount, sufficiently mixing the electroless copper plating waste solution with the copper catalyst via stirring under the condition of electromagnetic oscillation and performing an autocatalytic reduction reaction to reduce copper ions in the electroless copper plating waste solution into copper simple substances
Implementation Method 2
introducing the adjusted waste solution into a three-dimensional electrolysis device having a particle electrode for advanced oxidation treatment of COD, ammonia nitrogen and organic matters in the waste solution
Implementation Method 3
adding a precipitator in an amount of 4-10 mg/L to coagulate impurities in the waste solution
Implementation Method 4
adding a precipitator in an amount of 4-10 mg/L to coagulate impurities in the waste solution
Implementation Method 5
carrying out membrane separation on the supernatant obtained in step (3) using the membrane filtration plant, discharging clear water after separation, returning concentrate containing remaining copper ions after separation
Implementation Method 6
sufficiently mixing the electroless copper plating waste solution with the copper catalyst via stirring under the condition of electromagnetic oscillation
Data Source
AI summary
The disclosure discloses an online resourceful treatment method of electroless copper plating waste solution. According to the disclosure, a copper catalyst is adopted to perform autocatalytic reaction on electroless copper plating waste solution in an autocatalytic reactor, copper simple substances are reduced from copper ions in the waste solution and recycled, the treated waste solution enters into a three-dimensional electrolyzer and a membrane filtration plant for further purification, the finally treated electroless copper plating waste solution meets water quality discharge standard, and the recovery rate of the copper simple substances can reach up to above 95%.