Method for regenerating alkaline solutions
AssigneePhinergy Ltd.
InventorsILYA YAKUPOV, AVIEL DANINO
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Abstract
This invention relates to the regeneration of spent alkaline solutions, for example, alkaline electrolyte solutions used in metal/air batteries, specifically in aluminum/air batteries. The invention provides methods and systems to regenerate alkaline electrolyte solutions by adding water and optionally other solvents to spent electrolyte solutions, thus precipitating metal hydroxides from the spent electrolyte solution.
Claims13
A method of treating a spent electrolyte solution of a metal-air battery, the method comprising:
- adding water and one or more organic solvent(s), or adding one or more organic solvent(s) to the spent electrolyte solution to induce precipitation of metal hydroxide, optionally with the help of seeding, separating the metal hydroxide precipitate from the aqueous-organic mother liquor, removing said organic solvent(s) from the mother liquor, and recovering a solution comprising aqueous alkali hydroxide.
(canceled)
A method of operating an aluminum/air battery, comprising withdrawing from said battery a spent electrolyte solution of alkali metal aluminate, adding water and one or more organic solvent(s), or adding one or more organic solvent(s) to said solution to induce precipitation of aluminum hydroxide, separating the so-formed precipitate from the aqueous-organic mother liquor, removing said organic solvent(s) from the mother liquor and directing the mother liquor comprising aqueous alkali hydroxide back to said aluminum/air battery.
Dependencies are inferred from the claim text.