METHOD FOR UNDERGROUND LEACHING OF METALS FROM SULFIDE-CONTAINING MINERAL RAW MATERIALS Russian patent published in 2021 - IPC E21C41/22 E21B43/28 C22B3/04 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining and, in particular, to the integrated development and use of mineral deposits. The method consists in the fact that in the reactor chamber, which is formed by the extraction of ore and the walls of which are formed by a solidified backfill, the bottom is erected from the backfill mixture, the raw material is loaded into the reactor chamber, drilled in the erected bottom of the well to remove the productive solution, the raw material is irrigated from above with a solution for leaching and withdrawing the productive solution through the wells in the bottom. After loading the raw material, it is pre-drilled in the erected bottom of the well to supply the oxidizing gas, after which the raw material is pre-oxidized with an oxidizing gas in a high-temperature mode in the temperature range from 200 to 900°C, while the oxidizing gas is fed through the wells to supply the oxidizing gas and the waste sulfur-containing gases from the upper part of the chamber, and drilling in the erected bottom of the wells to remove the productive solution is carried out after the end of the oxidation process. A variant of the method is also proposed.

EFFECT: invention is aimed at increasing the leaching efficiency of sulfide-containing mineral raw materials by providing preliminary formation of readily soluble oxidized forms of the raw materials.

10 cl, 6 dwg