Electrolytic Metal Recovery With Peelable Porous Cathode Deposits
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Solution Overview
Problem
Existing metal recovery methods using electrolysis face challenges with adhered metal deposits on cathodes, requiring disassembly and grinding, as flowing waste liquids hinder powder formation and recovery.
Innovation Solution
A method involving stationary waste liquids and high current density to form sponge-like porous metal bodies on cathodes, which are easily peeled off by hydrogen bubbles, eliminating the need for grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waste liquid flows through the electrolytic cell during metal deposition, then metal can be continuously recovered, but metal adheres to the cathode and cannot be recovered in powder form
Solution Approach 1:
The patent changes the flow rate parameter of the waste liquid to a specific range (0.5-5 cm/s) and adjusts current density (1-10 A/dm²) to optimize the balance between continuous recovery and powder formation. By precisely controlling these parameters, the system achieves continuous metal recovery while preventing adhesion to the cathode.
Solution Approach 2:
The patent introduces a dynamic flushing mechanism where flushing solution flows in the opposite direction to the waste liquid during metal deposition. This dynamic opposing flow prevents metal adhesion to the cathode while maintaining continuous operation, allowing the system to adapt between deposition and flushing phases.
2Shape
If high current density is applied to form powder metal on cathode, then metal can be recovered in powder form, but metal still adheres to cathode when waste liquid flows
Solution Approach 1:
The patent introduces flushing solution as an intermediary substance that mediates between the deposited metal and the cathode. The flushing solution flows opposite to the waste liquid during deposition, acting as a protective intermediary that prevents metal adhesion while allowing powder formation to continue.
Solution Approach 2:
The patent implements periodic alternating phases of metal deposition and flushing. During deposition phase, high current density forms powder metal; during flushing phase, opposite flow removes adhered metal. This periodic switching allows the system to achieve both powder formation and easy recovery.
3Productivity
If waste liquid flows during electrolysis, then continuous processing is possible, but deposited metal adheres to electrode plates requiring disassembly and grinding
Solution Approach 1:
The patent enables the system to self-maintain by using the flushing mechanism to automatically remove adhered metal during continuous operation. The flushing solution flowing in opposite direction during deposition phase prevents metal buildup, eliminating the need for manual disassembly and grinding of electrode plates.
4Ease of operation
If flushing solution flows opposite to waste liquid during deposition, then adhered metal can be removed, but processing time increases
Solution Approach 1:
The patent maintains continuous useful action by overlapping deposition and flushing operations. The flushing solution flows during the deposition phase itself rather than requiring separate removal steps, ensuring that metal removal happens continuously alongside metal deposition, thus minimizing total processing time.
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 method allows for easy recovery of fine metal particles without residue on electrodes, extending apparatus life and simplifying the recovery process.
Implementation Method 1
Electrolysis is often used to recover metal from a waste liquid rich in metal ions
Implementation Method 2
the fine particles are then pushed away from the electrode by hydrogen bubbles being produced at the cathode
Data Source
AI summary
A metal recovery method includes: injecting a solution containing metal existing in an ionic state into a container where electrode plates are disposed; keeping the solution stationary relative to the electrode plates; passing a current between the electrode plates to form a sponge-like porous metal body on an electrode plate serving as a cathode; and separating the sponge-like porous metal body from the electrode. The deposited metal on the electrode does not adhere to the electrode plate, and thus can be recovered.