METHOD FOR FILLING MASS FORMING OF HARDENING SLAG MIX Russian patent published in 2006 - IPC E21F15/00 

FIELD: mining industry, particularly underground mineral mining with excavated space filling with hardening filling mix.

SUBSTANCE: method involves mixing grinded lime-containing binding agent, mixing water and filler; delivering the filling mix to area to be filled; filling mine space with the filling mix in several layers. The lime-containing binding agent is active silica-alumina material and burnt carbonate rock including at least 40% of active Cao+MgO. Above rock is grinded so that not more than 15% of grinded material remains on sieve having 0.08 orifice dimensions. Amount of the grinded burnt carbonate rock is selected so that active Cao+MgO is not more than 9.1% of filling mix mass. Water consumption for oxide Ca and Mg conversion in hydroxide is not more than 20% of burnt carbonate rock recalculated to active CaO+MgO. Retarder is added in mixing water in amount determined from R=(0.005-0.021)-C_r/C_w, where R is retarder content in 1 l of mixing water, kg; (0.005-0.021) is factor, which considers retarder-burnt carbonate rock ratio in the filling mix; C_r is burnt carbonate rock content in filling mix, kg; C_w is experimentally determined mixing water content in filling mix, l. Mine space filling rate is chosen from hardening time and self-heating degree of filing mass. The filling mix contains active silica-alumina material in amount of 5.6-33.2% by weight, carbonate rock burnt at 900-1200°C and containing active CaO+MgO of not less than 40% in amount of 1.0-16.7%, mixing water with retarder in amount of 10.6-27.5%, remainder is filler.

EFFECT: increased operational safety due to improved quality mine space filling, reduced costs and increased mine intensity.

6 cl, 4 tbl, 5 dwg