Recovery of zinc from sulphidic concentrates

Details Recovery of zinc from sulphidic concentrates Recovery of zinc from sulphidic concentrates

C - Chemistry, Metallurgy

22

B

C22B 3/04 (2006.01) C22B 3/08 (2006.01) C22B 19/00 (2006.01)

Patent

CA 2202289

There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes may include those incorporating a single stage pressure leach, a process involving two stage countercurrent or cocurrent pressure leaches or a multistage leach process for recovering zinc, lead and silver from zinc bearing sulphidic materials which also contain lead and silver.

L'invention concerne une nouvelle classe d'additifs, spécifiquement des charbons, lesquels sont utiles dans des procédés d'extraction de zinc mettant en oeuvre une ou plusieurs étapes de lessivage sous pression exécutées à des températures supérieures au point de fusion du soufre. On peut citer parmi ces types de procédés ceux impliquant un lessivage sous pression à une phase, un procédé comportant des lessivages sous pression à contre-courant ou à cocourant en deux phases ou un procédé de lessivage multiphase perm ettant la récuperation de zinc, de plomb et d'argent à partir de matériaux sulfurés porteurs de zinc, lesquels contiennent également du plomb et de l'argent.

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