Production of zinc oxide from acid soluble ore using...

C - Chemistry – Metallurgy – 22 – B

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C22B 19/34 (2006.01) B03D 1/00 (2006.01) C01G 9/02 (2006.01) C22B 3/02 (2006.01) C22B 3/08 (2006.01) C22B 3/20 (2006.01) C22B 3/44 (2006.01) C22B 3/46 (2006.01)

Patent

CA 2415732

The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with sulphuric acid; precipitating iron and silica from the leach solution using calcium oxide; removing copper, cadmium and cobalt from the leach solution by cementation with zinc dust; precipitating zinc oxide from the leach solution using calcium oxide; and upgrading zinc content in zinc oxide precipitates by separating zinc oxide from gypsum using a flotation or granulometric sizing technique.

La présente invention concerne un appareil et un procédé de production d'oxyde de zinc à partir d'un matériau contenant du zinc, soluble dans l'acide. Ce procédé, selon la présente invention, consiste à effectuer une lixiviation de la matière à base d'oxyde de zinc à l'aide d'acide sulfurique, à précipiter le fer et la silice de la solution de lixiviation à l'aide d'oxyde de calcium, à retirer le cuivre, le cadmium et le cobalt de la solution de lixiviation par cémentation à l'aide de poussière de zinc, à précipiter l'oxyde de zinc de la solution de lixiviation à l'aide d'oxyde de calcium, et à enrichir le contenu de zinc afin d'obtenir des précipités d'oxyde de zinc par séparation de l'oxyde de zinc du gypse par technique de flottation ou de calibrage granulométrique.

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