Biooxidation process for recovery of metal values from...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/18 (2006.01)

Patent

CA 2073589

A process for biooxidation of sulfides in a heap of mineral ores by freeing precious metals dispersed or occluded within said ores as pyritic or arsenopyritic sulfides and the like; the process comprises forming particulates from ore particles with an inoculate comprising bacteria capable of attacking, by biooxidation, sulfides and/or elemental sulfur in said or. particles; agglomeration aids may be used for forming particulates in conjunction with the foregoing which are acid resistant and not attacked by the bacteria; from these particulates a heap is constructed; and the biooxidation takes place in such heap by further adding to or dispersing within the heap the biooxidation solution and thereafter a leaching solution, circulating the leaching solution within the heap and recovering the precious metal values from the heap; recovery may be accomplished with a cyanide, thiourea, or a thiosulfate lixiviant.

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