Hydrometallurgical treatment process for extraction of...

C - Chemistry – Metallurgy – 22 – B

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C22B 11/06 (2006.01) C22B 3/06 (2006.01) C22B 3/42 (2006.01)

Patent

CA 2332520

A hydrometallurgical treatment process for extracting platinum group metals from a flotation concentrate in which the invention revolves around obviating the matte smelting and granulating process. Instead the concentrate is submitted to pressure leaching, oxidative or reductive roasting and final recovery by means of ion exchange adsorption. Roasting is applied in order to convert the platinum group metals to a form that dissolves in chlorine/HCL and a chlorine/HCL leach that renders the platinum group metals in solution.

On décrit un traitement hydrométallurgique d'extraction de métaux de la mine de platine à partir d'un concentré de flottation, ledit traitement rendant inutile le processus de fusion pour matte et de granulation. Dans le procédé de l'invention, le concentré est soumis à une lixiviation sous pression puis à un grillage d'oxidation ou de réduction avant d'être récupéré par absorption par échange d'ions. Le grillage est réalisé en vue de convertir les métaux de la mine de platine en une forme pouvant se dissoudre dans le chlore/chlorhydrate ou dans une liqueur d'attaque de chlore/chlorhydrate qui provoque la fusion des métaux de la mine de platine en solution.

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