Copper Removal from Aluminum Desmutting Solutions
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Solution Overview
Problem
The frequent replacement of large volumes of desmutting solutions in aluminum processing is costly and environmentally impactful due to high copper ion concentrations, which interfere with further processing stages and require extensive downtime for solution changeover.
Innovation Solution
A method and system that recirculates and treats the desmutting solution by adding an iron cyanide compound, such as ferricyanide or ferrocyanide, to form a copper-containing precipitate, which is filtered and returned to the tank, maintaining copper ion concentrations between 100 ppm to 475 ppm, thereby extending solution life and preventing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the desmutting solution is frequently replaced to maintain copper ion concentration below interfering levels, then the processing quality is improved, but the production downtime and operational costs increase significantly
Solution Approach 1:
The patent implements continuous copper removal by circulating the desmutting solution through a treatment system that precipitates copper ions using sodium hydroxide and filters them out. This allows the desmutting process to continue uninterrupted while copper concentration is continuously controlled, eliminating the need to stop production for solution replacement.
Solution Approach 2:
The patent introduces an intermediary treatment system between the desmutting tank and the waste stream. This system uses sodium hydroxide as a mediating chemical to precipitate copper ions from the solution, and filtration equipment to remove the precipitate, thereby maintaining solution quality without requiring complete replacement.
2Object-affected harmful factors
If large volumes of desmutting solution are replaced regularly to control copper ion concentration, then the copper smut interference is eliminated, but the material waste and environmental impact increase
Solution Approach 1:
The patent recovers copper from the desmutting solution by precipitating it as copper hydroxide using sodium hydroxide, then filtering and removing the copper-containing precipitate. This prevents copper from building up to interfering levels while minimizing the disposal of entire volumes of desmutting solution, thereby reducing material waste.
Solution Approach 2:
The patent converts the harmful accumulation of copper ions in the desmutting solution into a beneficial process by using the copper precipitation reaction to remove copper. The copper that would otherwise be a contaminant is transformed into a removable precipitate, turning a quality problem into a controllable separation process.
3Reliability
If the desmutting solution is replaced frequently to maintain optimal copper ion levels, then the solution effectiveness is maintained, but the operational costs and environmental burden increase
Solution Approach 1:
The patent implements preliminary copper removal action by continuously treating the desmutting solution as copper ions accumulate. The circulation system and precipitation process are activated before copper concentration reaches interfering levels, preventing the need for complete solution replacement and maintaining consistent solution effectiveness.
4Ease of operation
If the copper ion concentration is allowed to rise in the desmutting solution, then the operational complexity is reduced, but the copper redeposition on workpieces occurs
Solution Approach 1:
The patent implements continuous copper removal through a circulation system that constantly processes the desmutting solution. Copper ions are continuously precipitated by sodium hydroxide and filtered out, maintaining copper concentration below redeposition levels throughout the desmutting operation without requiring manual intervention or solution replacement.
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
This approach significantly extends the life of the desmutting solution, reduces waste, and maintains optimal processing conditions without interrupting operations, as the copper ion concentration is regulated within a desired range, minimizing the need for frequent solution replacements.
Implementation Method 1
Copper ions present in the aluminum desmutting solution are contacted with the aqueous reagent solution at the mixing section to form a precipitate comprising at least one copper-containing compound
Data Source
AI summary
Methods, systems and apparatuses are disclosed for treating aluminum desmutting solutions by reacting, mixing and filtering an aluminum desmutting solution flow from an aluminum desmutting solution tank and controlling the amount of copper ions in an aluminum desmutting solution tank by directing a portion of the desmutting solution from a desmutting solution tank to a treatment line, reacting a portion of the desmutting solution in the treatment line and recirculating a filtered aluminum desmutting solution to the aluminum desmutting solution tank during active desmutting operation of the aluminum desmutting solution tank.