... the kinetic response of the tailings tochanges in the chemical environment. Introduction The problem of reducing the volume of sludge resulting from the processing ofoil sand via the hot-water process is a problem of coarsening or removing thefiner fraction of the tailings. The reason for investigating...

... Abstract A preliminary investigation of sludge rheology was carried out on two tailings pond sludge samples; a low bitumen content (1%) and a high bitumen content (3–4%) sample. Steady state shear stress versus shear rate measurements and dynamic measurements were performed. Quanlitativ8...

... surrounding the pond. About one half of the silt and clay and almost all of the unextracted bitumen remain in suspension and are carried out towards the centre of the pond. Eventually, these solids form a sludge having a gel-like structure and containing a significant proportion of the process water (1...

... Introduction The hot water process to extract bitumen from oil sands produces about 0.4 m 3 of tailings sludge for each barrel of extracted bitumen. Densification of this sludge beyond 30% solids content Is extremely slow under gravity settling, leading to the accumulation of large quantities...

... Abstract The large quantities of sludge and extraction tailings water contained in pondsat the closure of oil sands leases have been identified as significantenvironmental concerns, Tests have been conducted to assess changes in tailings pond water quality overtime. Biological, toxicological...

... Introduction The production of large quantities of tailings sludge r in the extraction of bitumen from oil sands by the Clark I shot water process, poses a major environmental problem with regards to its final disposal. This sludge is retained in tailings ponds where it remains fluid, even...

... Introduction The one characteristic of oil sand fine tailings which most determines its undesirable properties is its stability. Oil sand tailings sludge is persistent. A major objective of fundamental research on fine tailings is therefore to discover which components and which interactions...

... Introduction The processing of oilsands produces a significant volume of stable waste products that consist of a mixture of bitumen, clays, minerals, and water. Together these components form a mixture termed ‘sludge’. The compositions and structures of various particulate populations...

... Abstract Freeze fracture preparation and subsequent direct observation of frozen hydrated samples in an electron microscope has been used to characterize the morphology and composition of oil sands sludges. A card house type of structure has long been suggested to explain the long term...

... Abstract The settling of a synthetic sludge and purified kaolinite in various liquid phases was studied in order to determine the collcidal forces of particle interaction responsible for flocculation. Hydration forces seem to be important in the interactions of quartz particles. More detailed...

... scale removal efficiency. Using this methodology, realistic ferric and ferrous ion content in the pumped acid, before entering the wellbore, can be correctly determined. This data could be used to specify iron loading level for competent sludge preventive acid systems. This could minimize acidizing...

... Abstract Probably the greatest limitation of the Hot Water Extraction Process (H.W.E.P.) is that it results in the unavoidable formation of huge sludge ponds. Despite many attempts, no technology for "dry" tailings production has been commercialized. Several experimental methods of dewatering...

.... extraction leonoff consulting engineer publication rights sludge northern alberta oil sand deposit disposal system oil sand plant oil sand dyke disposal area bitumen complex reservoir disposal metals & mining disposal scheme overburden environmental concern mining operation operation...