COMPLEX DEVELOPMENT METHOD OF COAL FIELD Russian patent published in 2010 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: complex development method of coal field refers to mining, namely to complex development of coal field during underground coal gasification, and can be used for obtaining underground coal gasification products, heat carrier with specified parametres and for preproduction mining of rhenium. After generator gas leaves the well, first, it is cooled to the temperature not less than condensation temperature of gaseous rhenium compounds, and at that, heat energy is obtained for heat supply system; then gas is scrubbed in water, and at that, there obtained is rhenium-containing water solution, heating heat carrier and gas of increased humidity; at that, gas is dried, and rhenium-containing solution is cleaned from slurry and cooled; at that, there obtained is purified and dried gas, heat energy and rhenium-containing solution cleaned from mechanical impurities, which then is supplied for rhenium to be extracted e.g. with electrolysis.

EFFECT: increasing development efficiency owing to preproduction mining of rhenium, reducing harmful effect on environment.

1 dwg