PROCEDURE FOR COMPLEX DEVELOPMENT OF COAL DEPOSIT Russian patent published in 2010 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: procedure for complex development of coal deposit refers to mining, particularly to complex development of coal deposit with underground gasification of coal and can be implemented for extracting products of underground gasification of coal and heat carrier with specified parametres; it also can be implemented for associated extraction of selenium. Producer gas exhausted from a borehole is first cooled to temperature not below temperature of gaseous selenium condensation; also there is produced heat power for a heat supplying system. Further gas is quickly cooled with a coolant to a temperature below the temperature of gaseous selenium condensation. Thus there is produced stripped gas, amorphous forms of selenium, selenious acid and waste coolant; selenium and selenious acid are sent to utilisation, while waste coolant is sent to reduction and repeated usage. Ice (H₂O), dry ice (CO₂) or their mixture can be used as coolants.

EFFECT: increased efficiency of development due to associated extraction of selenium, and reduced adverse effect to environment.

1 dwg