Process for the extraction of zinc from sulphide concentrates

Details Process for the extraction of zinc from sulphide concentrates Process for the extraction of zinc from sulphide concentrates

C - Chemistry, Metallurgy

22

B

C22B 3/08 (2006.01) C22B 19/02 (2006.01) C22B 19/20 (2006.01)

Patent

CA 2167729

A portion of the concentrates is roasted and a portion of the resulting calcine is subjected to a neutral leaching step. Another portion of the concentrates is directly leached in an acidic medium in the presence of oxygen and under atmospheric conditions together with at least a portion of the neutral leaching residue. The zinc- and iron-rich solution resulting from acid leaching is neutralised with another portion of tha calcine, the iron is removed and the solution is reused in the neutral leaching step. The method enables a gradual increase in the capacity of an existing zinc plant in accordance with demand. while capital costs may advantageously be spread out over time.

Une partie des concentrés est grillée. Une partie de la calcine ainsi produite est soumise à une lixiviation neutre. Une autre partie des concentrés est lixiviée directement en milieu acide ensemble avec au moins une partie du résidu de la lixiviation neutre, ceci en présence d'oxygène et dans des conditions atmosphériques. La solution riche en zinc et en fer produite par cette lixiviation acide est neutralisée avec une autre partie de la calcine, ensuite débarrassée de son fer et finalement recyclée dans la lixiviation neutre. Ce procédé permet d'augmenter progressivement la capacité d'une usine de zinc existante, ceci selon les besoins et avec un échelonnement avantageux des frais d'investissement.

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