Leaching in the presence of abrasive

Details Leaching in the presence of abrasive Leaching in the presence of abrasive

C - Chemistry, Metallurgy

22

B

C22B 3/14 (2006.01) C22B 15/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2188398

The invention relates to a process for leaching copper and or nickel values from feed solids with a lixiviant containing ammonia and ammonium bisulfite with agitation in the presence of relatively larger abrasive solids and an oxidant, preferably air or oxygen. The solids scrub the surface of the feed solids and aid an the constant exposure of fresh surfaces for increased leaching kinetics as well as overall extractions. The process is particularly useful for solids containing copper sulfides.

L'invention se rapporte à un procédé de lixiviation du cuivre et/ou du nickel à partir de sources solides utilisées comme charges au moyen d'un agent de lixiviation contenant du gaz ammoniac et du bisulfure d'ammonium. Ce procédé s'effectue par brassage en présence de solides abrasifs relativement gros et d'un agent d'oxydation, de préférence l'air ou l'oxygène. Les solides abrasifs nettoient la surface d'une charge de solides et facilitent l'exposition constante des nouvelles surfaces en vue d'obtenir une meilleure cinétique de lixiviation et des taux d'extraction maximaux. Le procédé s'applique notamment à des solides contenant des sulfures de cuivre.

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