C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/18 (2006.01)
Patent
CA 2203258
A method for improving the heap biooxidation rate of refractory sulfide ore particles that are at least partially biooxidized using a recycled bioleachate off solution is provided. The method includes the steps of biooxidizing a heap (10) of refractory sulfide ore particles with a bioleachate solution; collecting, from the heap, a bioleachate off solution that includes a plurality of inhibitory materials dissolved therein, the concentration of each individual inhibitory material being below its individual inhibitory concentration but the combined concentration of at least two of the inhibitory materials being sufficient to inhibit the biooxidation rate of the refratory sulfide ore particles; conditioning (20) the bioleachate off solution to reduce the inhibitory effect caused by the combined concentration of the at least two inhibitory materials; recycling the reconditioned bioleachate solution (22) to the heap; and biooxidizing the refractory sulfide ore particles in the heap with the reconditioned bioleachate solution.
Un procédé permet d'améliorer le taux de bio-oxydation d'une halde de minerai contenant des particules de sulfure non amalgamables qui sont au moins partiellement bio-oxydées à l'aide d'une solution secondaire d'un biolixiviat recyclé. Ce procédé consiste à bio-oxyder une halde (10) de particules de sulfure non amalgamables d'un minerai avec une solution d'un biolixiviat; à collecter à partir de cette halde, une solution secondaire de biolixiviat qui comporte plusieurs matériaux inhibiteurs dissous, la concentration de chaque matériau inhibiteur étant inférieure à sa concentration individuelle d'inhibition mais la concentration combinée d'au moins deux matériaux inhibiteurs suffisant à inhiber la bio-oxydation des particules de sulfure non amalgamables du minerai; à conditionner (20) la solution secondaire de biolixiviat pour réduire l'effet inhibiteur dû à la concentration combinée de ces deux matériaux inhibiteurs; à recycler la solution de biolixiviat (22) reconditionnée vers la halde; et à bio-oxyder les particules de sulfure non amalgamables de cette halde de minerai avec la solution de biolixiviat reconditionné.
Johansson Chris
Kohr William J.
Shield John
Shrader Vandy
Geobiotics Inc.
Smart & Biggar
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