关键词: 充填配比, 正交试验, 温度, 充填采矿法, 全尾砂

Abstract:

For the purpose of studying the influence of cement-to-tailings mass ratio，mass fraction of solid phases and temperature for performance indicators of backfill material，control parameters of backfill materials which fitted mining requirements in different temperature ranges were determined.Considering engineering practice for magnetite in northern part，whole-tailings of the mine were selected as filling aggregate.A new cementing material supplied by a university was selected as binder.Based on the method of orthogonal test，the optimization experiment of backfill materials was performed.Sensitivities of the four indicators to the three factors were obtained.The four indicators were compressive strength，bleeding rate，collapsing slump and initial setting time.Changing trends of indicators with factors were likewise identified.Additionally，the most optimal composition was observed in this study.The results demonstrated that compressive strength can be improved and shorten the initial setting time by increasing cement-to-tailings mass ratio.The bleeding rate and collapsing slump were most sensitive to mass fraction of solid phases.Moreover，the properties of backfill material appeared to be better with goaf temperature increasing.When the temperature were around 10 ℃and 20 ℃，optimal proportion was that cement-to-tailings mass ratio was 1∶6 and mass fraction of solid phases was around 70%.When the temperature was approximately 30 ℃，optimal proportion of backfill materials presented with cement-to-tailings mass ratio about 1∶8 and mass fraction of solid phases around 72%.It can be concluded that applying different parameters under different goaf temperature was conductive to reducing the filling cost.

Key words: back-filling proportion, orthogonal test, temperature, back-filling method, whole-tailing