Abstract: In order to increase the supply of underground mines and reduce the cost of filling and mining,a new filling cementing material ratio test was launched around a tailings of a mine in eastern Hebei,blast furnace slag of a steel plant and the addition of an activator.Exploratory tests,slurry tests,and cementsand ratio test shows that the 1∶7 cementsand specific strength of the newly developed filling cementitious material is three times that of the same ratio of 42.5R cement,and its price is 60%~ 70% lower than that of ordinary portland cement.It fully meets the requirements of the mine filling process,can achieve the purpose of improving the mine′s economic benefits and saving production costs,and at the same time it has a good role in promoting environmental governance.

Key words: Deep mine,Low cost,Tailings,Filling material