Process for treating impurity streams for disposal

C - Chemistry – Metallurgy – 22 – B

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C22B 3/08 (2006.01) C22B 15/00 (2006.01) C22B 30/00 (2006.01)

Patent

CA 2216119

Impurity streams generated during the metallurgy of copper are hydrometallurgically processed at ambient pressure for recovery of primary values in an energy-efficient manner and with the capture and conversion of metallic impurities to states that are acceptable for disposal into the environment. Hallmark features of the various embodiments of this invention include the water leach of flue dust, a controlled acid leach stage in which metal species are solubilized, the extraction of copper as a sulfide, and the ability to operate the various process stages at essentially ambient pressure.

La présente invention consiste à traiter par hydrométallurgie aux conditions normales de pression les impuretés dégagées par la métallurgie du cuivre, et ce, afin de rétablir des valeurs initiales en économisant l'énergie. Ce procédé permet en outre de piéger les impuretés métalliques et de les amener à des états compatibles avec un rejet dans l'environnement. Les caractéristiques majeures des différentes réalisations de l'invention sont une lixiviation à l'eau de la poussière de carneau, la dissolution des espèces métalliques au cours d'une phase contrôlée de lixiviation acide, l'extraction du cuivre sous forme de sulfure, et la possibilité de conduire les différentes opérations du processus aux conditions normales de pression.

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