C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/18 (2006.01) C12P 3/00 (2006.01)
Patent
CA 2054806
The invention relates to a bio-metallurgical process in which mineral compounds contained in mineral ores or concentrates and constituting substrates for microorganisms, are bio-oxidized to allow solubilization and separation thereof. This process is characterized by the following steps: a) conditioning the mineral ore or the concentrate with the quantity of acid which is determined before-hand as the most convenient in order to neutralize the mineral ore or the concentrate, prevent compaction and provide the proper acidity for the microorganisms, said quantity of acid being preferably contained in the minimum possible volume of a solution, or contacting the mineral ore or the concentrate as acid vapours so as to homogeneously acidify the substrate while introducing the minimum possible amount of water into the system; b) adding a microbial inoculum capable of oxidating the mineral compound of interest, or enriching the mineral ore's own microbial flora, either simultaneously with or independently from step a); c) enabling the spontaneous or induced loss of the excess of water that may be present in the system by evaporation or by drying with flowing air until the thermodynamically available water is sufficiently low for obtaining the bio-oxidation products in solid state, said bio-oxidation products, in turn, constituting microbial colonies: and d) separating the bio- oxidation products.
Leaching S.r.l.
Na
Shell Chile S.a. Commercial E. Industrial
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