C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/44 (2006.01) C22B 19/00 (2006.01)
Patent
CA 2468885
This invention relates to a method for the removal of iron as hematite from a zinc sulphate solution in atmospheric conditions during the electrolytic preparation of zinc. According to the method, the pH of the iron-containing solution is adjusted to a value of at least 2.7, oxygen-containing gas is fed into the solution and part of the hematite thus formed is recirculated to the precipitation stage.
L'invention concerne un procédé permettant d'évacuer le fer en tant qu'hématite à partir du sulfate de zinc en solution dans des conditions atmosphériques lors de la préparation électrolytique du zinc. Selon le procédé, le pH de la solution contenant du fer est réglé à une valeur d'au moins 2,7, un gaz contenant de l'oxygène alimente la solution et une partie de l'hématite ainsi formée est renvoyée au stade de précipitation.
Lahtinen Marko
Lehtinen Leena
Takala Heikki
Norton Rose Or S.e.n.c.r.l.,s.r.l./llp
Outokumpu Oyj
Outotec Oyj
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