Copper Electrolysis Cell Horizontal Flow Injection
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Solution Overview
Problem
Conventional copper electrolysis cells face limitations in achieving high current densities due to the Nernst diffusion layer thickness, leading to dendritic formation and electrical short circuits, which reduces copper precipitation efficiency and quality, and existing parallel flow cell designs suffer from material strain, anode sludge issues, and inefficient flow conditions.
Innovation Solution
The electrolyte is injected horizontally and parallel to the electrodes at the lower third of the cell, with a speed of 0.3 to 1.0 m/s, and the electrolyte inflow box is designed to extend along a longitudinal wall with nozzles for directed supply, ensuring a stable cathode plate arrangement and optimized flow guidance, reducing the hydrodynamic boundary layer and enhancing inhibitor distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current density is increased to increase copper production, then the productivity increases, but dendritic formation occurs leading to electrical short circuits and reduced cathode quality
Solution Approach 1:
The patent changes the flow regime parameter from natural convection to forced parallel flow, increasing the relative motion between electrolyte and electrode. This reduces the Nernst diffusion layer thickness, allowing higher current densities (up to 1000 A/m2 theoretical limiting) without dendritic formation, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent applies hydraulic principles by implementing a forced flow system where electrolyte is pumped through the cell at controlled velocities (0.3-1.0 m/s). This hydraulic control optimizes mass transport to the electrode surface, enabling high current density operation while maintaining uniform copper deposition and preventing short circuits
2Productivity
If the Nernst diffusion layer thickness is reduced to increase limiting current density, then the current density can be increased, but complex flow control mechanisms are required
Solution Approach 1:
The patent applies local quality by creating a parallel flow regime specifically in the electrode gap region, while other parts of the cell may have different flow characteristics. The flow-inlet boxes are positioned to generate flow primarily where needed (between electrodes), simplifying the overall system while achieving the desired local effect of reduced diffusion layer thickness
Solution Approach 2:
The patent segments the flow control function by using separate flow-inlet boxes for anolyte and catholyte that independently feed the electrode gap. This segmentation allows simplified individual components to work together, achieving complex flow patterns without requiring a single complex control mechanism
3Productivity
If conventional transverse flow configuration is used, then the cell structure is simple, but the flow conditions between electrodes are poor and current density is limited
Solution Approach 1:
The patent transitions from static natural convection flow to dynamic forced parallel flow between the electrodes. The electrolyte is actively pumped through the cell at controlled velocities, creating a dynamic flow regime that continuously renews the electrolyte at the electrode surface, enabling higher current densities while maintaining a relatively simple cell structure
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 increases the limiting current density, improves copper precipitation on the cathode, promotes anode sludge settling, and maintains cathode quality without requiring extensive cell modifications or increased material strain, achieving higher current yields and efficient operation in existing cells.
Implementation Method 1
The main flow thus occurs between the cell wall and the electrodes or the cell bottom and the lower edges of the electrodes, respectively. This flow applied from the outside (also referred to as a forced convection)
Implementation Method 2
The flow between the electrodes is determined by the natural convection resulting from the density differential of the electrolyte in front of the cathodes (lighter electrolyte due to the depletion of copper ions) and in front of the anodes (heavier electrolyte due to the accumulation of copper ions)
Implementation Method 3
In principle, copper in the form of copper(II)ions is solubilized anodically in a copper electrolysis and precipitates on the cathode to form again metallic copper
Implementation Method 4
copper in the form of copper(II)ions is solubilized anodically in a copper electrolysis and precipitates on the cathode to form again metallic copper
Implementation Method 5
an optimization of the flow guidance in the electrolysis cell based on a maximum relative motion from the electrolyte to the electrode is achieved, which advantageously results in a reduction of the hydrodynamic boundary layer, an equalization of the concentration and temperature of the electrolyte
Data Source
AI summary
In a process for the operation of copper electrolysis cells including a plurality of anode and cathode plates arranged vertically and parallel to each other, a longitudinal electrolyte inflow and an electrolyte outflow, the electrolyte is injected via the electrolyte inflow horizontally and parallel to the electrodes in each electrode gap always at the height of the lower third of the electrodes at a speed of from 0.3 to 1.0 m/s, with the cathode plates being arranged stationarily relative to the inflow direction. As a result, an optimized flow guidance of the electrolyte with regard to the electrodes is achieved, resulting in an increase in the limiting current density.