C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 19/02 (2006.01) C22B 1/02 (2006.01) C22B 3/04 (2006.01) C22B 19/20 (2006.01)
Patent
CA 2246272
The invention concerns a process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment to convert sphalerite to a substance that is more readily attacked in hydrometallurgical media and, in a second step, said substance is leached, whereby said thermal treatment consists essentially of a hearing cycle performed in such conditions that sphalerite is, at least partly, transformed to wurtzite, and of a rapid cooling cycle, performed in such conditions as to retain, at least partly, this wurtzite at low temperature.
L'invention concerne un procédé de récupération de zinc à partir de minerais et de concentrés contenant de la sphalérite. Ledit procédé consiste premièrement à soumettre les minerais ou les concentrés à un traitement thermique de façon à transformer la sphalérite en une substance qui est plus facilement attaquée dans un milieu hydrométallurgique et, deuxièmement à soumettre ladite substance à une lixiviation. Ledit traitement thermique est principalement constitué d'un cycle de chauffage exécuté dans des conditions telles que la sphalérite est, au moins en partie, transformée en wurtzite, et d'un cycle de refroidissement rapide, exécuté dans des conditions favorisant la rétention, au moins en partie, de cette wurtzite à basse température.
Brouwer Sybolt
Vanhoutte Dirk
Macrae & Co.
N.v. Umicore S.a.
N.v. Union Miniere S.a.
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