METHOD OF HEAP LEACHING GOLD Russian patent published in 2019 - IPC C22B11/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy and can be used in heap leaching of gold from ores, concentrates and tailings. Method of heap leaching of gold includes the processing of mineral raw materials with a leaching solution, pelletizing, laying of the pelleted ore into a pile, irrigating the pile and removing the metal from the productive solution. Pelletizing of the ore is carried out with the addition of a solid oxidizing agent, in which quality calcium peroxide is used with a flow rate of 0.1–0.3 kg/t. As a moisturizing solution during pelletization, cyanide solution is used in an amount that provides a final moisture content of 5–30 %. Consumption of sodium cyanide is 0.1–1 kg/t, and the pelleted ore is subjected to ultrasound treatment before being stacked, and the stacking before irrigation is carried out for 2–3 days.

EFFECT: intensification of gold recovery by cyanidation.

1 cl, 1 dwg, 1 ex