Vorobyova M. Obtaining gold-cyanide solutions with minerals using plasma chemical treated water

The thesis is devoted to the scientific substantiation and development of the technology of obtaining gold-cyanide solutions of mineral, with water, treatment under the fluency of the contact nonequilibrium low-temperature plasma, to increase the degree of extraction of gold from refractory ores and concentrates. In the thesis thermodynamic analysis has been performed and the kinetic parameters of dissolution of gold and silver cyanide solutions have been determined, based on water, treatment under the fluency of the contact nonequilibrium low-temperature plasma. Mineralogical and technological assessment of ore concentrate of Bobrykivsky field (Luhansk region, Ukraine) has been made and reasons of persevere of this minerals raw materials to the conventional technology of cyanide leaching have been determined. To prevent decomposition of peroxides compounds of plasma chemical treated water, under the action and polyvalent ions of heavy metals presenting in gold mineral raw materials the application of phosphoric acid salts and polymers has been investigated. The influence of the main technological parameters on the degree of extraction of gold and silver from mineral raw materials has been studied and conditions, providing the greatest degree of extraction of gold in solution with using plasma chemical-treated water have been determinated. The technological scheme and comparative economic assessment of the feasibility of extraction of precious metals from ore concentrates of cyanide solutions, made on the basis of plasma chemical water of treated water have been developed. Key words: gold, cyanidation solution, non-equilibrium low temperature plasma, leaching, refractory concentrate.