C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 11/00 (2006.01) C22B 3/08 (2006.01) C22B 3/16 (2006.01) C22B 3/18 (2006.01)
Patent
CA 2373014
A leaching process for the recovery of gold from a gold containing ore is described in which a gold ore is lixiviated with an acid (pH 0.5-2.0) solution containing 1-15 g/l thiourea in the presence of an oxidising agent and a reducing agent. The concentrations of thiourea and of formamidine disulphide are determined for example by a high pressure liquid chromatographic method, and an amount of oxidising agent or reducing agent being added to maintain the molar ratio of thiourea: formamidine sulphide to between about 2:1 and 5:1.
La présente invention concerne un procédé de lessivage destiné à la récupération d'or à partir d'un minerai aurifère, dans lequel ce minerai subit une lixiviation au moyen d'une solution acide (pH 0,5-2,0) contenant 1-15 g/l de thiourée en présence d'un agent oxydant et d'un agent réducteur. Les concentrations de thiourée et de bisulfure de formamidine sont déterminées, par exemple, à l'aide d'une méthode de chromatographie liquide à haute pression, et d'une quantité d'agents oxydant ou réducteur ajoutée en vue de maintenir le rapport molaire thiourée sur sulfure de formamidine entre environ 2:1 et 5:1.
Foley Barry
Kavanagh Peter
Smalley Nigel
Dublin Institute Of Technology
Foley Barry
Kavanagh Peter
Minmet Plc
Ridout & Maybee Llp
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