Continuous Electro-Reduction Apparatus for Solid Feedstock Processing
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Solution Overview
Problem
Existing electro-reduction processes for solid feedstocks are primarily batch-based and face challenges due to the complexity of mechanical structures immersed in high-temperature, chemically-aggressive, and corrosive fused-salt environments, making continuous commercial production difficult.
Innovation Solution
A continuous electro-reduction apparatus and method involving a container for fused salt with a movable cathode assembly that passes beneath an anode assembly, allowing for the electrochemical reduction of solid feedstocks while minimizing exposure of moving parts to the fused salt, using a cathode transport apparatus to load and unload the feedstock and product in an inert atmosphere to prevent reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical structures are immersed in fused-salt melt for continuous electro-reduction, then continuous production capability is improved, but device complexity and susceptibility to corrosion increase
Solution Approach 1:
The invention extracts the moving parts (cathode and feedstock) from the fused-salt melt environment. The cathode is lowered into the melt only for the duration of the electro-reduction process, then raised and removed completely. This extraction eliminates the need for complex mechanical structures to remain immersed in the corrosive melt, while still enabling continuous production through sequential processing of multiple cathodes.
2Productivity
If mechanical structures are immersed in fused-salt melt, then continuous electro-reduction is enabled, but reliability decreases due to corrosion and mechanical wear
Solution Approach 1:
The cathode and feedstock are extracted from the corrosive fused-salt melt environment after the electro-reduction process is complete. By raising and removing the cathode from the melt, the invention minimizes exposure time to corrosive conditions, thereby improving reliability and reducing mechanical wear while maintaining continuous production capability through sequential processing.
Solution Approach 2:
The invention rapidly transitions the cathode from the fused-salt melt environment to an inert atmosphere. The cathode is quickly raised and moved to the inert atmosphere zone, minimizing the time spent in the corrosive environment. This rapid transition reduces corrosion and mechanical wear, improving reliability while maintaining continuous production efficiency.
3Device complexity
If feedstock is processed in batch processes, then equipment simplicity is maintained, but productivity and efficiency are reduced
Solution Approach 1:
The invention implements continuous processing by sequentially lowering multiple cathodes loaded with feedstock into the fused-salt melt for electro-reduction. While one cathode is being processed, another can be prepared or is already in the process cycle. This continuous action eliminates the idle time associated with batch processes, improving productivity and efficiency while keeping the equipment design relatively simple.
Solution Approach 2:
The invention introduces dynamic movement of the cathode between different environments (inert atmosphere and fused-salt melt) to enable continuous processing. The cathode is lowered into the melt for electro-reduction, then raised and moved to the inert atmosphere for product removal. This dynamic operation allows continuous production while maintaining equipment simplicity through the use of a single processing cell.
4Productivity
If cathode remains immersed in fused salt, then electro-reduction continues, but product contamination and re-oxidation increase
Solution Approach 1:
The cathode and electro-reduced product are extracted from the fused-salt melt and transferred to an inert atmosphere. This extraction prevents contact between the hot, reactive product and the fused-salt melt or atmospheric oxygen, eliminating sources of contamination and re-oxidation. The product remains protected in the inert atmosphere until cooling and removal.
Solution Approach 2:
The invention introduces an inert atmosphere environment above the fused-salt melt to receive and protect the cathode and product after electro-reduction. This inert atmosphere acts as a protective barrier, preventing oxidation and contamination of the hot, reactive metal product while it is being transferred and cooled, thereby improving product quality without compromising electro-reduction 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
Enables a stable and efficient continuous production of solid metal or alloy products by reducing the risk of corrosion and mechanical wear, facilitating the commercial-scale production of metals and alloys from solid feedstocks.
Implementation Method 1
A voltage applied between the anode and the cathode by a power supply reduces the solid feedstock to a solid product, or a reduced feedstock
Data Source
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AI summary
The method, apparatus and product relate to the electrochemical reduction of a solid feedstock (20) to produce a product. A container (2) is filled with a fused salt (6), and one or more anodes (14) contact the fused salt. A cathode (18) is loaded with feedstock and engages with a transport apparatus (22, 36, 40) which locates and moves the cathode past the anodes(s), while the cathode and the feedstock contact the fused salt. As the cathode moves past the anodes(s), a voltage applied between the cathode and the anode(s) electrochemically reduces the solid feedstock to form the product.