Composite Anode Structure for Copper Electrowinning
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Solution Overview
Problem
Conventional lead-based anodes in copper electrowinning processes contaminate copper products with lead and require additional cobalt sulfate for stabilization, leading to inefficiencies and increased costs.
Innovation Solution
A new anode structure for electrowinning cells featuring a hanger bar, conductor rods with an inner core and outer layer, and a perforated substrate, which allows for flow-through anodes and conventional cathodes, reducing lead contamination and improving economic benefits and electrode lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lead-based anodes are used in copper electrowinning, then the electrowinning process can proceed, but lead contamination occurs in the copper product
Solution Approach 1:
The patent extracts and removes the harmful lead component from the anode material, replacing it with non-toxic alternatives such as stainless steel or titanium. This eliminates lead contamination in the copper product while preserving the electrowinning process capability. The anode is designed without lead-based materials, thereby taking out the source of contamination.
Solution Approach 2:
The patent employs composite material structures for the anode, combining stainless steel or titanium with appropriate coatings or surface treatments. These composite materials provide the necessary electrochemical functionality without introducing lead contamination, thus resolving the contradiction between process capability and product purity.
2Productivity
If lead-based anodes are used, then electrowinning can be performed, but additional cobalt sulfate must be added to stabilize the anode
Solution Approach 1:
The patent removes the requirement for cobalt sulfate stabilization by eliminating lead-based materials from the anode. The alternative anode materials (stainless steel, titanium) do not require cobalt sulfate for stability, thereby simplifying the electrolyte composition while maintaining electrowinning process capability.
Solution Approach 2:
The patent adopts anode materials that are inherently stable and do not require additional chemical stabilizers, reducing the complexity of electrolyte management. The anodes are designed to be durable and maintenance-free regarding chemical stabilization.
3Productivity
If lead-based anodes are used, then the electrowinning process can operate, but the anode surface corrodes and releases lead particles
Solution Approach 1:
The patent uses composite material structures with stainless steel or titanium as the base material, providing inherent corrosion resistance. These materials form stable passive oxide layers that prevent further corrosion and lead particle release, ensuring long-term anode stability and reliable electrawinning operation.
Solution Approach 2:
The patent creates a chemically inert environment at the anode surface through the formation of stable oxide films on stainless steel or titanium. This inert surface layer prevents unwanted chemical reactions and corrosion, maintaining anode stability during electrowinning operation.
4Ease of manufacture
If conventional anode structures are used, then manufacturing is simpler, but electrode lifetime is shorter
Solution Approach 1:
The patent employs composite material construction for the anode, combining durable substrates (stainless steel or titanium) with appropriate surface treatments or coatings. This composite structure enhances electrode lifetime through superior corrosion resistance while maintaining manufacturability through established fabrication processes.
Solution Approach 2:
The patent changes the material parameters of the anode from lead-based to stainless steel or titanium, fundamentally altering the corrosion resistance and lifetime characteristics. This parameter change enables extended electrode lifetime while preserving ease of manufacture through available fabrication technologies.
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 new anode structure enhances copper product quality and process efficiency while eliminating the need for cobalt sulfate, offering significant economic benefits and extended electrode lifespan.
Implementation Method 1
anode for an electrowinning cell that accommodates flow-through anodes and conventional cathodes. This allows for the production of high quality copper from copper-containing solutions using either a conventional electrowinning process or a direct electrowinning process
Data Source
AI summary
An electrode for use in producing copper in either a conventional electrowinning cell or the direct electrowinning cell is provided. The electrode includes a hanger bar and an electrode body coupled with the hanger bar. The electrode body includes at least one conductor rod having a core and an outer layer surrounding the core and a substrate coupled with the conductor rod.