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Increasing demand for gold in many countries all over the world per year requires the rational utilization of gold resource and effective protection of the environment [1, 2]. Alkaline solution of cyanide commonly uses for the recovery of gold from ores by leaching, however due to the environmental problems of the cyanide leaching, there is need to find practical alternative reagents to cyanide [1-3]. The alternative reagents are thiourea, halide (chloride, bromide and iodide) systems that can be used for this purpose. The main advantages of chlorine which is one of the alternative systems are faster dissolution rate of gold and no passivation of gold surfaces than cyanide leaching process. However, the major disadvantages of the chlorine systems are highly corrosive nature, highly reactive with the sulphate and gangue minerals and instability of gold chloride complex formed etc [2-4]. Therefore main two of the alternative reagents are thiourea and iodide leaching systems due to the lower standard redox potential of their complexes with gold and stability of the resulting complexes in the solution. The standard potential of the half-reaction of gold in the solution with thiourea and iodide is EAuTU2 + =0.38-0.42V and EAuI + =0.53-0.57V respectively [57]. Among them, thiourea [SC(NH2)2 leaching was extensively studied as a potential substitute to cyanide leaching due to its lower toxicity and faster initial reaction kinetics for gold and silver with an appropriate oxidant [5, 6, 8]. Due to the development of the thiourea gold leaching system, various methods have been proposed for the recovery of gold from its leach solution by cementation [9], carbon adsorption [10], electrowinning [11] and ion exchange/solvent extraction [12, 13]. However, there is limited information on the recovery of gold from thiourea pregnant solution using organosilicon polymer with ion exchange. Due to the efficient recovery of gold from gold ore and concentrate, it is necessary to clarify thiourea leaching system and extraction system. The aims of this study were: (i) to find optimum conditions for gold leaching in acidic thiourea solution; (ii) to study the effect of acid concentration, adsorption time and temperature on the recovery of gold from its pregnant solution by organosilicon polymer (PSTM-3C).

Gold Recovery from its Flotation Concentrate using Acidic Thiourea Leaching and Organosilicon Polymer