METHOD OF COMPREHENSIVE DEVELOPMENT BROWN COAL DEPOSITS Russian patent published in 2014 - IPC E21B43/295 E21C41/18 

FIELD: mining.

SUBSTANCE: method of comprehensive development of brown coal deposits comprises dividing the deposits into blocks, drilling drainage wells and underground coal gasification, dissolution of ash and slag residues of coal and pumping of productive solution to the surface for subsequent extraction of valuable components, filling the goaf of the block with the filling material. Six rows of vertical wells are drilled, located in a block with the distance of 20-25 m from one another, which are sequentially used as drainage, productive for the gasification of coal, for dissolution and extraction of ash and slag residuals of coal, and for injection of filling mixture. In each row 10-12 vertical wells are located at a distance of 15-20 m from one another. Underground water is pumped and directed through the unit of water treatment to consumer. Underground coal gasification gas is purified from impurities in the unit of energy gas purification and burned in a local gas electric station. The resultant carbon dioxide is injected in the filling mass via the storage unit and the productive solution is purified from the solid impurities and pumped through a pipeline to a chemical-technological unit connected with the filling complex by the unit of unutilised wastes.

EFFECT: effective comprehensive use of brown coal deposits and comprehensive protection of the environment from the production process impact.

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