Process for removing sodium sulfate from nickel hydroxide...

Details Process for removing sodium sulfate from nickel hydroxide... Process for removing sodium sulfate from nickel hydroxide...

C - Chemistry, Metallurgy

01

G

C01G 53/04 (2006.01) C01D 5/00 (2006.01) C02F 1/22 (2006.01)

Patent

CA 2416917

A method for removing sodium sulfate from nickel and ammonia containing aqueous effluents. The effluents, typically from a nickel hydroxide production process, are cooled to or below 30~C to crystallize and precipitate the sodium sulfate and dewater the effluent. The sodium sulfate is retrieved and the remaining solution is recycled back to the nickel hydroxide production process.

L'invention concerne un procédé d'élimination de sulfate de sodium dans des effluents aqueux chargés de nickel et d'ammonium. Ces effluents, issus généralement d'un procédé de production d'hydroxyde de nickel, sont refroidis à 30 ·C ou moins pour cristalliser et précipiter le sulfate de sodium et déshydrater les effluents. Après l'élimination du sulfate de sodium, le reste de la solution est réinjecté dans le processus de production d'hydroxyde de nickel.

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