Electrolysis apparatus

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, and
• a 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.