The combined leaching process

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 23/00 (2006.01) C22B 3/06 (2006.01) C22B 3/08 (2006.01) C22B 9/00 (2006.01) C22B 21/00 (2006.01) C25C 1/06 (2006.01) C25C 1/08 (2006.01)

Patent

CA 2629167

The combined leaching process comprises a dissolution process of the soluble constituents of an ore by means of the combined execution of two or more serial leaching phases with the first phase comprising atmospheric leaching (AL) and the second one pressure leaching (HPAL). This combined process takes place when the intermediate size fraction (0.075-0.5 mm) (1) is submitted to atmospheric leaching (AL), ensuing an effluent with a high concentration of dissolved iron and aluminum as well as high residual acidity. This said effluent (3) is fed in the following acid pressure leaching (HPAL) phase of the fine size fraction (<0.075mm) (4) and at reusing free acidity, regenerating the sulfuric acid through iron and aluminum precipitation in a hydrolysis reaction, and bringing forth a considerable reduction in the addition of sulfuric acid.

L'invention concerne un procédé de lixiviation combiné comprenant une opération de dissolution des constituants solubles d'un minerai par exécution combinée de deux ou plusieurs phases de lixiviation en série, la première phase comprenant une lixiviation atmosphérique (AL) et la seconde phase une lixiviation par pression (HPAL). Ce procédé combiné est mis en oeuvre lorsque la fraction de taille intermédiaire (0,075-0,5 mm) (1) est soumise à une lixiviation atmosphérique (AL) en vue de l'obtention d'un effluent présentant une haute concentration en fer et en aluminium dissous ainsi qu'une haute acidité résiduelle. Ledit effluent (3) est alors acheminé dans la phase de lixiviation par pression acide (HPAL) suivante de la fraction fine (<0,075 mm) (4), la réutilisation de l'acidité libre ainsi que la régénération de l'acide sulfurique par précipitation du fer et de l'aluminium dans une réaction d'hydrolyse permettant d'obtenir une réduction considérable de l'addition d'acide sulfurique.

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