PROCEDURE FOR EXTRACTING GOLD FROM BROWN AND MINERAL COALS Russian patent published in 2010 - IPC C22B11/00 C22B1/02 C22B3/24 

FIELD: metallurgy.

SUBSTANCE: invention refers to extraction of gold from natural organic raw material, particularly to procedure for extraction of gold from brown and mineral coals. The procedure consists in their combustion and production of smoke fumes with gold containing sublimates, in sublimates catching and in gold sorption. Also gold containing sublimates are caught by mixing smoke fumes with water vapour. Further, generated fume-gas mixture is cooled in three stages whereat temperature is lowered at each stage. At the first stage temperature is lowered from 110-120°C to 50°C, at the second stage - from 50°C to 30°C, at the third stage - from 30°C to 10°C. At the second and third stages there are produced condensates concentrated by gold contents, out of which gold is sorbed.

EFFECT: high concentration of gold in finish products and efficient gold catching.

1 dwg, 1 ex