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A removable electrode module for engagement with an electrolysis chamber comprises a first electrode, a second electrode, and a suspension structure. The suspension structure comprises a suspension rod coupled to the first electrode. The second electrode is suspended or supported by the suspension s

A removable electrode module for engagement with an electrolysis chamber comprises a first electrode, a second electrode, and a suspension structure. The suspension structure comprises a suspension rod coupled to the first electrode. The second electrode is suspended or supported by the suspension structure, which comprises at least one electrically-insulating spacer element for retaining the second electrode in spatial separation from the first electrode.

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1. A removable electrode module for engagement with an electrolysis chamber and reduction of a solid feedstock, the removable electrode module comprising, a first electrode, in which the solid feedstock is retainable in contact with a first surface of the first electrode such that the solid feedstoc

1. A removable electrode module for engagement with an electrolysis chamber and reduction of a solid feedstock, the removable electrode module comprising, a first electrode, in which the solid feedstock is retainable in contact with a first surface of the first electrode such that the solid feedstock can be reduced by electrolysis,a second electrode, anda suspension structure comprising a suspension rod coupled to the first electrode,in which the second electrode is suspended by, or supported by, the suspension structure and in which the suspension structure comprises at least one electrically-insulating spacer element for retaining the second electrode in spatial separation from the first electrode,the removable electrode module further comprising one or more bipolar electrode having a composite structure, the one or more bipolar electrode having a first portion or cathodic portion made of a metallic material, and a second portion or anodic portion made of a material selected from the list consisting of an inert anode material for the evolution of oxygen, a dimensionally-stabilised anode material and a carbon material,in which the first portion and/or second portion of the one or more bipolar electrode are formed from a porous or perforated or foraminous material, such that molten salt can flow through the first and/or second portion of the bipolar electrode. 2. The electrode module according to claim 1, in which the first electrode is a terminal cathode and the second electrode is a terminal anode, the terminal cathode and the terminal anode being couplable to a power supply to enable a potential to be applied between the terminal cathode and the terminal anode. 3. The electrode module according to claim 1, wherein the one or more bipolar electrode is supported in spatial separation between the first electrode and the second electrode by the at least one electrically-insulating spacer elements. 4. The electrode module according to claim 3, in which a first surface of the one or more bipolar electrode becomes cathodic when a potential is applied between the first electrode and the second electrode, and in which a solid feedstock is retainable in contact with a first surface of the bipolar electrode such that the solid feedstock can be reduced by electrolysis. 5. The electrode module according to claim 1, in which the suspension rod passes through the second electrode. 6. The electrode module according to claim 1, in which the suspension structure comprises more than one suspension rod, each suspension rod being coupled to the first electrode. 7. The electrode module according to claim 1, further comprising a cover for closing an opening of the electrolysis chamber when the module is in engagement with the electrolysis chamber. 8. The electrode module according to claim 7, in which a first surface of the cover interacts with a surface surrounding the opening of the electrolysis chamber to seal the opening of the electrolysis chamber. 9. The electrode module according to claim 7, in which the suspension rod passes through a hole defined through the cover such that a portion of the suspension rod is external to the electrolysis chamber when the module is in engagement with the electrolysis chamber. 10. The electrode module according to claim 7, in which the cover comprises a thermally-insulating material or a plurality of thermally-insulating materials and provides a thermal barrier. 11. The electrode module according to claim 7, in which a first surface of the cover interacts with a surface surrounding the opening of the electrolysis chamber to support at least part of the weight of the electrode module. 12. The electrode module according to claim 7, in which an electrical connection for the second electrode passes through a hole defined through the cover. 13. The electrode module according to claim 1, in which the electrodes include a terminal cathode and a terminal anode, and wherein the one or more bipolar electrode is disposed between the terminal cathode and the terminal anode. 14. The electrode module according to claim 1, for use in the electro-deoxidation of a solid feedstock in a molten salt electrolyte in which the solid feedstock comprises a metal oxide. 15. The electrode module according to claim 14, wherein the metal oxide is a metal compound or a metal oxide, or a mixture of metal compounds or metal oxides. 16. The electrode module according to claim 15, wherein the metal oxide is a titanium oxide or a tantalum oxide. 17. The electrode module according to claim 1, in which the suspension rod is formed from a metallic alloy and at least a portion of the suspension rod is clad in an electrically-insulating material. 18. The electrode module according to claim 1, wherein the at least one electrically-insulating spacer element is formed from a ceramic material. 19. The electrode module according to claim 1 in which the electrodes include a cathode, an electrical connection being made between the cathode and a power supply by physical contact between the cathode and an electrical conductor within the electrolysis chamber. 20. The electrode module according to claim 1, that is suspendable from a lifting element at an upper end of the module, seatable on the first electrode at a lower end of the module, and/or suspendable from a cover. 21. The electrode module according to claim 20, suspendable from a lifting element at an upper end of the module, when being lowered into or lifted out of the electrolysis chamber. 22. The electrode module according to claim 20, seatable on the first electrode at a lower end of the module, when in engagement with the electrolysis chamber. 23. The electrode module according to claim 20, suspendable from the cover when in engagement with the electrolysis chamber. 24. The electrode module according to claim 1, comprising a coupling means for coupling the module to a lifting mechanism to raise and lower the module. 25. The electrode module according to claim 24, in which the coupling means comprises a j-slot connector situated at an upper end of the module, the entire module being capable of being suspended from the j-slot connector. 26. The electrode module according to claim 1, in which the electrodes include an anode, and having electrical connection between the anode and a power supply at more than one point on the anode. 27. The electrode module according to claim 1, in which at least a portion of at least one of the electrodes is removable from the module for loading with a feedstock. 28. The electrode module according to claim 1, comprising between 1 and 20 of the at least one bipolar electrode. 29. The electrode module according to claim 1, wherein the porous or perforated or foraminous material is a mesh.