Abstract
As a result of comprehensive studies of the material composition of the flotation concentrate and the forms of gold presence, it was established that the chemical composition of the concentrate is 55.17% represented by lithophile components with the mass fraction of 55.17%. The main ones are silica and alumina with mass fractions of 36.4% and 8.26%, respectively. Ore mineralization of the flotation concentrate is represented by pyrite with the mass fraction of 40.7%. It has been established that gold in the flotation concentrate sample is present in native form. The bulk of gold grains is represented by particles with a size of 10-38 microns - 82.89%. About 63% of gold is in free form. The proportion of closed grains is 9.23%. The main mineral in the flotation concentrate sample, associated with gold, is pyrite – 25%. The portion of gold associated with quartz is 3.07%. For industrial operation, sorption type of cyanidation of flotation concentrates with a consumption of Norit RO 3520 activated carbon in an amount of 10% of the volume of the liquid phase is recommended as the optimal mode. The parameters for sorption cyanidation of flotation concentrate have been established: flotation concentrate size – P80 10 microns; sodium cyanide concentration – 0.1% (sodium cyanide consumption – 2.3 kg/t); pH – 10.5; pulp density – 40% (solid); duration of the process is 24 hours. With the established parameters, relatively high, at least 86%, extraction of gold into the solution was achieved.