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- W2308060147 abstract "Sedimentation, consolidation and drying of the fluid fine tailings (FFT) in Alberta's oil sands tailings ponds represent a major environmental issue. Society and government are concerned about the vast amount of FFT ( 900 million m3) which has accumulated in numerous tailings ponds during the last 46 years. The tailings streams, consisting of water, sand, silt, clay and residual bitumen, are discharged at approximately 55% solids by mass into tailings ponds where most of the sand and about half the fines settle out to form dykes and beaches. The rest of the fines and water flows into the settling pond where it slowly sediments over a few years to 30-35% solids. Much research has been conducted by industry to increase the FFT solids content by mechanical and chemical means and by deposition in shallow disposal areas. To meet the Alberta Energy Regulator's shear strength requirement (greater than 5 kPa within 1 year of deposition), some drainage and atmospheric drying has been found necessary. This paper aims to document the volume change of FFT during consolidation and desiccation. To understand the long-term consolidation behaviour of FFT in the tailings ponds, a largescale self-weight consolidation test was established at the University of Alberta, which was continuously monitored for 30 years. Results of this long-term consolidation test show the unique consolidation behaviour of the FFT. Unsaturated soil properties measured by drying tests and associated shrinkage curve tests are presented to complete the journey of the FFT from a fluid to a solid." @default.
- W2308060147 created "2016-06-24" @default.
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- W2308060147 date "2014-01-01" @default.
- W2308060147 modified "2023-09-27" @default.
- W2308060147 title "From fluid to solid: Oil sands fluid fine tailings" @default.
- W2308060147 hasPublicationYear "2014" @default.
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