C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/44 (2006.01) C02F 1/52 (2006.01) C02F 1/56 (2006.01) C02F 1/64 (2006.01) C02F 1/66 (2006.01) C22B 23/00 (2006.01) C22B 34/32 (2006.01) C23G 1/36 (2006.01)
Patent
CA 2450345
A method for the removal of metals from their aqueous solution as metallic hydroxides and gypsum using lime precipitation, comprising introducing a lime compound and a majority of a feed solution containing nickel, iron and chrome into a first neutralization stage to form a metallic hydroxide-gypsum slurry having a pH at least 10.5, feeding the balance of the feed solution and the slurry from the first neutralization stage in its entirety to a second neutralization stage where the pH of the slurry is adjusted to at least 9.5 and a precipitate forms; after the final neutralization stage setting the precipitate in a settling stage, and recirculating the settled metallic hydroxide-gypsum slurry to the first neutralization stage, wherein the pH of the second neutralization stage is less than the pH of the first neutralization stage, and wherein all of the lime compound or neutralizing agent is fed to the first neutralization stage.
L'invention concerne un procédé d'élimination de métaux d'une solution aqueuse à l'aide d'une précipitation de chaux, dans des conditions permettant la formation d'un précipité d'hydroxyde métallique et de gypse qui sédimente bien et est facile à filtrer. Les métaux sont précipités de la solution aqueuse à une valeur de pH élevée et la suspension est recirculée plusieurs fois dans l'espace de précipitation. Le gypse est précipité sous forme de cristaux séparés plutôt que d'une couche solide. Le procédé convient particulièrement bien pour neutraliser la solution aqueuse contre le dérochage d'acier fin. Ce procédé permet d'éliminer des métaux et du fluorure de l'eau traitée.
Hultholm Stig-Erik
Nyman Bror
Salmi Juhani
Sivonen Jarmo
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Outokumpu Oyj
Outotec Oyj
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