Nested Electrode Molten Salt Electrolyzer for Magnesium Purity
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Solution Overview
Problem
Conventional molten salt electrolyzers face issues with low current efficiency and poor productivity per unit volume, leading to impurities in metal magnesium production and reduced purity, due to contamination and electrochemical corrosion, as well as inefficiencies in titanium sponge production.
Innovation Solution
A molten salt electrolyzer design featuring multiple electrolytic cell units with a prism-shaped cathode, a prism-shaped anode, and a rectangular cylinder bipolar electrode, where the bipolar electrode is positioned between the cathode and anode, optimizing electrode distances and arrangements to enhance current density and reduce reaction with inner wall materials, allowing for efficient metal magnesium production and improved titanium sponge purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If flat plate electrodes are used in the electrolytic cell, then the structure is simple, but the current efficiency is low and metal purity is poor due to contamination from inner wall materials
Solution Approach 1:
The invention employs nested cylindrical electrodes where the anode is positioned inside the bipolar electrode, which is in turn inside the cathode. This nested configuration creates multiple electrolytic cells within a single cell structure, maximizing the use of inner wall surfaces for electrolysis while preventing metal contamination from the outer cell walls.
2Manufacturing precision
If cylindrical or rectangular cylindrical multiple-electrodes are used, then the current efficiency improves, but waste space is caused between cells and electrolytic cell walls, reducing productivity per unit volume
Solution Approach 1:
The invention transitions from two-dimensional flat plate electrodes to three-dimensional cylindrical nested electrodes. This dimensional change allows the electrodes to surround each other concentrically, eliminating waste space between electrodes and cell walls while maintaining high current efficiency through optimized electrode spacing in the radial direction.
3Ease of manufacture
If conventional electrode arrangements are used, then the setup is straightforward, but electrochemical corrosion of inner wall materials occurs, reducing cell durability
Solution Approach 1:
The invention applies local quality by creating distinct electrolytic zones within different radial regions of the nested electrode structure. Each zone has optimized electrode spacing and configuration tailored to minimize corrosion at specific locations while maintaining overall system durability and performance.
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 improved design increases current efficiency, reduces production costs, and enhances productivity per unit volume, resulting in higher purity metal magnesium and titanium sponge production at a lower cost, while minimizing contamination and corrosion.
Implementation Method 1
a bipolar electrode which generates a magnetic field by flow of current
Implementation Method 2
a bipolar electrode which generates a magnetic field by flow of current, thereby suppressing convection of the molten salt
Implementation Method 3
subjecting magnesium chloride to fusion electrolysis using the molten salt electrolyzer
Data Source
AI summary
A molten salt electrolyzer having a metal collection chamber, an electrolysis chamber, and two or more electrolytic cell units positioned in the electrolysis chamber. Each electrolytic cell unit has a cathode having an inner space in a prism form; at least one bipolar electrode in a rectangular cylinder form and disposed in the cathode inner space; and an anode in a prism form and disposed in an inner space of the bipolar electrode. At least part of individual planes forming an outer side of the bipolar electrode closest to the cathode faces a plane forming the prism-form inner space of the cathode. At least part of individual planes forming the inner side of the bipolar electrode closest to the anode faces a plane forming the prism of the anode. At least one plane of the cathode constitutes one plane of a cathode of another electrolytic cell unit.