Abstract: Combined with the actual demand of Dahongshan Iron Mine,the application of the fine-grained tailings cementing filling material and the strength of the filling body are tested.The test results show that the new cementing material replaces the traditional Portland cement,and the classified tailings are cemented and filled with ash.When the cement sand ratio is 1∶10,it can meet the filling mining process requirements;when the full tailings are cemented,the new material cemented sand and sand ratio is 1∶8,28 d compressive strength and graded tailings cement cemented sandstone ratio 1∶4.28 d compressive strength of the sky is equivalent,which can effectively reduce the filling cost and has good economic and environmental benefits.

Key words: Filling material, Cement-sand ratio, Compressive strength, Filling cost