METHOD OF BURIAL OF HARMFUL WASTES IN FILL OF WORKED-OUT SPACE OF U UNDERGROUND MINE WORKINGS Russian patent published in 1997 - IPC

FIELD: environment control. SUBSTANCE: the offered method includes separation of waste into slime, its accumulation, preparation of obtained materials in form of briquettes in cementing mixture, lowering to mine, delivery to filled working-out space, and placing into rock mass. In so doing, harmful wastes are mixed with plastic mineral (clay, loam) and briquetted. Then, briquettes are mixed with finely divided ash-slag mixture, and granules of hydrated solidification are formed which are introduced in flow of slag-ash composition with foam suspension and convoyed through pipes to filling mass. To increase strength of granules and acceleration of granule hardening, they are dried for 15-30 min. Besides, filling mixture and foam concrete with briquettes are supplied to working alternately with time interval of I to 7 days after supply of foam concretes. Quantities of water in filling mix is limited by volume required for addition to binding agent. Size of briquettes and granules is taken in compliance with the method of their delivery by pipes. EFFECT: higher efficiency. 4 cl, 1 dwg