Improved leaching method

C - Chemistry – Metallurgy – 22 – B

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C22B 3/04 (2006.01) C22B 3/00 (2006.01)

Patent

CA 2649966

An improved leaching method (10) comprising the method steps of: i) preparing and stacking an ore material (12) to be leached such that the ore material is suitable for an atmospheric leach (18); ii) applying a lixiviant (20) at an initial predetermined irrigation rate for a period of time; iii) subsequently applying the lixiviant (20) at a second irrigation rate for a further period of time, the second irrigation rate being lower than the first irrigation rate; and iv) recovering metal values from a pregnant leach solution (22) resulting from steps ii) and iii).

L'invention concerne un procédé amélioré de lixiviation (10) comprenant les étapes de procédé consistant à (i) préparer et mettre en tas une matière de minerai (12) devant être lixiviée de telle sorte que la matière de minerai est prête pour une lixiviation atmosphérique (18) ; (ii) appliquer un lixiviant (20) à une vitesse d'irrigation prédéterminée initiale pendant une période de temps ; (iii) par la suite appliquer le lixiviant (20) à une seconde vitesse d'irrigation pendant une nouvelle période de temps, la seconde vitesse d'irrigation étant inférieure à la première vitesse d'irrigation ; et (iv) récupérer des valeurs en métal à partir d'une solution de lixiviation enrichie (22), résultant des étapes (ii) et (iii).

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