Abstract
In this work, rheological constants measurement and flow tests on powder slurries and tailings paste were carried out in order to get information needed to recycle tailings into backfiller for an underground stope. The tailings paste was Bingham fluid which can flow from larger stress than critical shear stress(yield stress). Apparent viscosity of the tailings paste demonstrates shear thinning phenomenon which decreases with increasing shear stress. The plastic viscosity and the yield stress of the powder slurries predicted by Bingham equation increased in order of fly ash < cement < ground blast furnace slag(GBFS) < tailings. This indicates that in case of making pastes of four powder systems (cement-fly ash-GBFS-tailings) for the stope backfill, its rheology was most affected by the tailings. Fresh tailings pastes will increase their flowability by adding the fly ash and the GBFS which can enhance long compression strength of harden tailings pastes due to pozzolanic property, thus facilitating transportation to the underground stope.
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