Abstract: In order to solve the difficulties existed in the process and utilization of the tailings of a gold mine in Shandong Province,the ratio of the new cementing powder,concentration of tailings and ashsand ratio are studied by single factor test.Through the analysis of the strength of cementing backfill,the optimum ratio of selfmade new cementing power is 60∶30∶10 (slag∶clinker∶desulphurization gypsum) based on the strength analysis of cementing backfill.When the tailings concentration is 72％and the ashsand ratio is 1∶10,the compressive strength of the 28 d consolidated backfill is 5.30 MPa,which meets the requirement of the 28 d strength (≥ 4 MPa） of the false roof of the downward drift filling mining method.Under the condition that the ashsand ratio is 1∶20,the compressive strength of the 28 d consolidated backfill is 1.82 MPa,which can meet the requirements of the 28 d strength (≥1 MPa) of the backfill except the false roof of the upward mining method and downward drift mining method.Under the conditions of the same concentration and the same ashsand ratio,the compressive strength of the cementing backfill by using the selfmade new cementing powder is 184％ higher than that of 42.5 ordinary portland cement,and the cost is 28.8％ lower than that of 42.5 ordinary portland cement,the effect and benefit are both significant.

Key words: Finegrained tailings,Cementation performance,Ratio,Backfill strength