Study on the proportion of coal gasification slag paste filling material

Abstract

Aiming at the utilization of coal gasification slag, it is proposed to prepare coal gasification slag as mine filling material. The optimum ratio of cement: coal gasification slag: gangue is 1:5:1, the mass fraction is 70%, and the dosage of quicklime is 4%. The strength of backfill reaches 4.23mpa, which can meet the requirements of mine backfill strength.