Electrowinning Cell Flow Path Layout for Even Metal Deposition
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Solution Overview
Problem
Conventional electrowinning cells become inefficient and require frequent shut-downs due to clogging by secondary metals like silver and copper, leading to uneven deposition and loss of product during cathode washing.
Innovation Solution
The electrowinning cell design includes impermeable anodes and secured cathodes to direct fluid flow below the anodes, maintaining a gap between the anode and housing, and securing cathodes to prevent flow below, ensuring a tortuous flow path that allows continuous operation and even deposition across all cathodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional permeable anodes are used to allow solution flow through the cell, then solution can circulate effectively through all cathodes, but the cathodes become clogged with secondary metals causing impermeability and reducing plating efficiency
Solution Approach 1:
The anode assembly is segmented into multiple impermeable anodes spaced apart, creating separate flow channels. This segmentation allows solution to flow through multiple paths simultaneously, preventing clogging of any single cathode and maintaining continuous effective circulation throughout the cell.
Solution Approach 2:
Instead of making the anodes permeable to allow flow through them (conventional approach), the invention inverts the approach by making the anodes impermeable. The solution flow is redirected to pass around and through the spaces between the impermeable anodes, achieving continuous circulation without clogging the cathodes.
2Loss of substance
If cathodes are removed frequently for washing due to clogging, then product loss is minimized, but operational time is reduced and productivity decreases
Solution Approach 1:
The impermeable anode configuration is designed in advance to prevent cathode clogging before it occurs. By establishing the flow paths around the impermeable anodes from the beginning, the system maintains continuous operation without requiring frequent interruptions for cathode removal and washing.
3Ease of operation
If solution flows over the top of clogged cathodes, then flow continues through the cell, but deposition is reduced and flow becomes focused toward the upper portion
Solution Approach 1:
The cell is segmented into multiple independent flow channels by spacing the impermeable anodes apart. This creates multiple parallel paths for solution flow, ensuring that solution distributes evenly across all cathodes rather than concentrating in the upper portion, thereby maintaining high deposition efficiency throughout.
Solution Approach 2:
The solution flow is redirected from a vertical path over the top of cathodes to a horizontal path through the spaces between anodes at the same level. This dimensional change in flow path allows solution to reach all cathodes evenly without vertical concentration, improving deposition distribution.
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 design reduces the frequency of shut-downs and loss of product by enabling continuous operation and even metal deposition, allowing for more efficient and predictable metal recovery with reduced capital costs and operational risks.
Implementation Method 1
Electrowinning involves immersing an array of anodes and cathodes in the pregnant electrolyte solution, and passing a current from an anode to a cathode, so that the metal is deposited onto the cathode
Implementation Method 2
The electrolytic process causes the gold and other secondary metals to be deposited on the cathodes, forming a plating on the surface
Data Source
AI summary
An electrowinning cell for extracting metals from an electrolyte solution, the electrowinning cell comprising a housing, a solution inlet, a solution outlet, a plurality of anodes, a plurality of cathodes and a product outlet, wherein at least one anode is substantially impermeable and configured to maintain a gap between a lower edge of the anode and the housing, so that fluid flow of solution is directed below the anode, and wherein at least one cathode is secured at a lower edge to the housing to prevent fluid flow below the lower edge of the cathode.