Method for processing sulfur-bearing materials using high...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/08 (2006.01) C01B 17/74 (2006.01) C22B 3/20 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2417422

The present invention relates generally to a process for the production of sulfuric acid and liberation of metal values such as copper and precious metals from materials containing sulfur through pressure leaching operations. In accordance with various aspects of the present invention, the sulfur- bearing materials may comprise residues from pressure leaching operations, such as those carried out at medium temperatures. The process of the present invention can be advantageously used to convert such sulfur-bearing materials to sulfuric acid by means of pressure leaching. The sulfuric acid so produced can be used beneficially in other mineral processing operations, for example those at the site where it is produced. Metals, such as precious metals, that are contained within the sulfur-bearing materials advantageously may be recovered from processing products by established precious metals recovery technology.

La présente invention concerne un procédé de production d'acide sulfurique et d'extraction de métaux précieux à partir de matériaux contenant du soufre, par des opérations de lixiviation sous pression. Selon divers aspects de cette invention, les matériaux portant du soufre peuvent comprendre des résidus issus d'opérations de lixiviation sous pression, telles que celles réalisées à des températures moyennes. Le procédé selon cette invention peut avantageusement être mis en oeuvre afin de transformer de tels matériaux portant du soufre en acide sulfurique, à l'aide d'une lixiviation sous pression. L'acide sulfurique ainsi produit peut être utilisé, de manière efficace, dans d'autres opérations de minéralurgie, telles que celles se déroulant sur le site où il est produit. Des métaux, tels que des métaux précieux, qui sont contenus dans les matériaux portant du soufre peuvent, de manière avantageuse, être récupérés à partir de produits de traitement, selon une technologie de récupération de métaux précieux existante.

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