Parallel Resistor Anode Structure for Copper Electrowinning
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Solution Overview
Problem
In metal electrodeposition plants, dendritic formations during non-ferrous metal electrowinning can cause uneven metal deposition, electrical short circuits, and damage to electrodes, posing safety risks and efficiency issues, particularly with modern anode materials like titanium, which are prone to extensive and irreversible damage from such short circuits.
Innovation Solution
An anodic apparatus with anodic panels connected through a plurality of resistors in parallel, which slows down dendritic growth and limits current in case of short circuits, using resistors with specific resistance values and geometric characteristics to manage current flow and minimize damage, while maintaining operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic monitoring systems with electronic components are used to control current, then dendritic growth can be monitored, but the system becomes complex and expensive and reliability decreases due to acid environment and high current densities
Solution Approach 1:
The patent extracts the monitoring function from complex electronic systems and implements it through simple ohmic resistors that inherently limit current through their resistance property. This removes fragile electronic components from the acidic environment while maintaining monitoring capability through basic electrical resistance principles.
Solution Approach 2:
The patent uses simple, inexpensive ohmic resistors instead of complex electronic monitoring systems. These resistors are robust, cheap components that can withstand the harsh electrolytic environment without requiring protection or maintenance, effectively serving as disposable protective elements.
2Reliability
If resistors are placed in series, then current limiting is achieved, but voltage drop increases and power consumption rises
Solution Approach 1:
The patent divides the current limiting function into multiple parallel resistor paths instead of using a single series resistor. This segmentation allows current to be distributed across multiple low-resistance paths, achieving protection while minimizing total voltage drop and power loss compared to a single high-resistance series element.
Solution Approach 2:
The patent uses multiple resistors with individual resistance values that are higher than the optimal single value, but when connected in parallel, the equivalent resistance becomes low enough to minimize power loss while still providing sufficient current limiting protection during short circuit conditions.
3Reliability
If resistors with higher resistance values are used, then current limiting improves, but voltage drop increases reducing operating efficiency
Solution Approach 1:
The patent segments the protection function across multiple parallel resistors, each with higher individual resistance values that provide adequate current limiting, while the parallel configuration maintains low equivalent resistance to minimize voltage drop during normal operation, thus preserving operating efficiency.
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 solution effectively slows down dendritic growth for over 24 hours, reduces damage from short circuits, and maintains plant efficiency by controlling current flow through selective resistor paths, thus protecting the anodic panel and ensuring safe and uniform metal deposition.
Implementation Method 1
at least one anodic panel and at least one electrical current distribution structure electrically connected together by means of a plurality of resistors placed in parallel
Data Source
AI summary
The invention relates to an electrode which can be employed in the cells of plants for the electrolytic extraction of copper and other non-ferrous metals from ionic solutions. The electrode consists of an apparatus comprising at least one anodic panel for the evolution of oxygen or chlorine connected through a plurality of resistors in parallel to at least one distribution structure for electrical current. The panel may optionally exhibit areas of electrical discontinuity. The invention also relates to an electrolyser using the electrode described above.