Experimental Study on Optimizing the Filling Ratio of Tailings in an Iron Ore Mine in Benxi
Based on the physical and chemical properties,slurry transportation performance,and filling strength of the tailings from a certain iron mine,slump tests,L-tube tests,and filling material ratio tests are conducted.The results show that the slump value of the filling slurry selected for pressurized pump transportation should be 25 to 27 cm,corresponding to a filling slurry concentration of 74%to 76%.When self flow transportation is selected,the slump value of the filling slurry should be 27 to 29 cm,corresponding to a filling slurry concentration of 72%to 74%.By calculating and analyzing the transportation resistance of a certain iron ore slurry under different filling conditions,it is found that the inner diameter of the transportation pipeline should not be too small,otherwise the resistance would be high.Increasing the inner diameter of the pipeline can greatly reduce the pipeline transportation resistance;The strength of the filling material increases with age,slurry quality and concentration,and cementitious material dosage.It is recommended that the cement-sand ratio for the top and bottom of the Step 1 with the stagewise open stoping with subsequent filling mining method be 1:6,the filling slurry concentration be 74%to 76%,the cement-sand ratio for the middle layer be 1:8,and the filling slurry concentration be 74%to 76%.The filling ratio for the top and bottom of the Step 2 is consistent with that of the Step 1,and the recommended filling ratio for the middle part is a cement sand ratio of 1:15,with a filling slurry concentration of 72%to76%;It's recommended that filling ratio for the top part with point pillar upward cut and fill stoping method be a cement sand ratio of 1:6 with a filling slurry concentration of 72%to 76%and the bottom filling ratio be a cement sand ratio of 1:15 with a filling slurry concentration of 72%to 76%.
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