| abstract |
Method for the regeneration of spent electrolyte from an electrochemical process that comprises the oxidation of aluminum, the spent electrolyte comprising an aqueous alkaline solution comprising dissolved aluminum hydroxide ions, in which said method is carried out in a system comprising: - at least one deposit; - solid-liquid separation means; - means of concentration; - stirring means; - inlet for the addition of solid and liquid reagents; and said method comprises: introducing the aqueous alkaline solution comprising dissolved aluminum hydroxide ions into said system; producing and separating solid aluminum-containing products comprising LDH and optionally comprising solid aluminum hydroxides from said solution and reducing the amount of aluminum hydroxide ions dissolved in said solution, thereby producing a regenerated aqueous alkaline solution comprising a reduced amount of dissolved aluminum hydroxide ions or that is free of dissolved aluminum hydroxide ions, wherein the production and removal of LDH from said solution comprises: adding metal B ions to said solution in said reservoir to induce the precipitation of LDH; separating said LDH from said solution; and optionally, drying said LDH. |