Method for treating waste waters and residue sludge by means of carbonation in a chemical installation for nitridation in a molten salt bath
AssigneeHydromecanique Et Frottement
InventorsFrédéric Garcia, Christophe Heau
Life of this patent
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Abstract
The present invention relates to a method for treating waste waters (E), and/or residue sludge (B) from an oxidation bath, to recover oxidation salts, in an installation (10) for nitridation in a molten salt bath, comprising a nitridation bath (11), an oxidation bath (12), and a stop bath (13). The method comprises a transformation of hydroxide ions OH− of waste waters (E) and/or residue sludge (B) into carbonate ions CO32−, and a separation of water and carbonate salts, to recover carbonate salts.
Claims6
1-6. (canceled)
A method for treating waste waters or residue sludge from an oxidation bath to recover carbonate salts, in at least one installation for nitridation in a molten salt bath comprising a nitridation bath, an oxidation bath, and a stop bath, the treatment method comprising the following steps:
- transforming hydroxide ions of waste waters or residue sludge from the oxidation bath by reaction of said hydroxide ions with carbon dioxide to form carbonate ions and water,
- separating water and carbonate salts, wherein the carbonate salts are formed by carbonate ions and metal cations from oxidation salts, and recovering the carbonate salts.
Dependencies are inferred from the claim text.