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An Integrated Model for Oil Sands Long Term Mine
Different types of tailings are the main unwanted by products of oil sands processing Huge volume of fresh and recycled water used in bitumen extraction process results in extensive ponds that are constructed to hold tailings slurry Since the available area for tailings dam construction is limited
Oil sands emissions by extraction method Busting myths
When factoring emissions from tailings ponds dilbit produced through SAGD extraction actually has lower GHG emissions than synthetic crude SCO produced through mining and upgrading While dilbit produced from mining presently has the lowest GHG emission intensity this will only continue to be the case if these facilities can keep a lid on
Oil Sands Extraction Methods Processes and EffectsOil
Both oil sand extraction approaches produce tailings fluids as a by product 15 Tailings fluid is stored in huge tailings ponds Those left by Alberta s oil industry can be seen from space 16 This slurry of heavy metals and hydrocarbons is so toxic that measures
USAMethod for treating oil sands extraction
Tailings from an oil sands hot water process extraction plant are mixed with hydrolyzed starch flocculant and transferred to a settling pond After a residence period on the order of one year sludge from the lower region of the settling pond is withdrawn mixed with a hydrolyzed starch dewatering agent and transferred to a collecting pond
The Ponds Oil sands extraction makes a lot of waste Where
Since 1968 the oil sands tailings ponds have been growing by leaps and bounds and now hold a total of 5 5 billion cubic metres of waste and water About 70 per cent of that volume is water By 2020 Syncrude and Suncor alone will have added another billion cubic metres to the ponds
Oil Sands Tailings Ponds Axora
Tailings ponds also allow water to separate from the rest of the compounds This water is then recycled for use in oil sands mining minimising the amount of freshwater from nearby sources that would otherwise be needed for the extraction process
Towards Integration of Oil Sands Mine and Tailings Plans
The slurry of water bitumen sand silt and fine clay that is produced from the extraction process is called tailings and is pumped to tailings ponds There are a number of environmental issues associated with the tailings ponds due to the bitumen remained in the tailings
Generating cash from tailings A Oil Sands Magazine
Oil sands deposits mined from the Athabasca Basin produces a variety of tailings streams that are mostly comprised of coarse silica sand Contained within the sand is a sizeable fraction of fines with trace concentrations of iron vanadium and titanium oxides as well as numerous rare earth minerals Although trace may not sound like a huge
Oil Sands Operators Tackle Tailings Management Challenges
Oil Sands Operators Tackle Tailings Management Challenges Extraction of bitumen from oil sands widely employs a water based extraction process the ore is mixed with hot water and agitated and 75 to 90 or more of the bitumen in the ore is floated off and recovered no oil sands tailings pond in the province has yet been reclaimed
Goose bumps CNRL develops oilsands mining idea that
An innovative technology for separating bitumen from sand could eliminate the need for tailings ponds reduce GHG emissions and cut the cost of producing a barrel of oil
USAMethod for treating oil sands extraction
Tailings from an oil sands hot water process extraction plant are mixed with hydrolyzed starch flocculant and transferred to a settling pond After a residence period on the order of one year
Waterless oil sands extraction Engineering at Alberta
The university is also researching ways to eliminate tailings ponds completely Nonaqueous extraction means separating oil from sand without the use of water and avoids the resulting tailings production and storage Instead organic solvents could directly extract the oil and allow the dry sand and clay to be stacked back in the mine pit
Tailings Pondan overview ScienceDirect Topics
The two tailings ponds contain a total of 20 3 million tons of tailings Fig 9 9 a their average uranium concentration being 67 g/t Because the barren process solutions were neutralised only to pH 7–8 instead of shifting pH to 10 5–11 during the milling process the TDS content exceeds 20 g/l in the liquid phase of the tailings The tailings ponds were built without any proper base
Methods to Reduce Production of Oil Sands Mature Fine
CHWE extraction process has very poor settling and consolidation properties because of clay dispersion caused by the use of the NaOH additive Tailings discharged from the extraction plant is a segregating type because of its low solids contents When deposited in a tailings pond the sand settles out rapidly to form dykes
Methane emissions from an oil sands tailings pond a
Extraction of the bi tumen from the oil sands involves large amounts of warm water various additives such as caustic soda and sodium cit rate and diluents such as naphtha or paraffin Simpson et al 2010 Small et al 2015 Non recovered diluents additives and bitumen along with water end up in large engineered tailings ponds
Goose bumps CNRL develops oilsands mining idea that
An innovative technology for separating bitumen from sand could eliminate the need for tailings ponds reduce GHG emissions and cut the cost of producing a barrel of oil
Sulfur Cycling in an Oil Sands Tailings Pond
settling basis on site As of 2014 these oil sands tailings ponds already cover an area of 182 km2 Alberta Environment and Research Development 2013 representing a large and unique mine water problem In the ponds tailings settle to the bottom reaching a density of about 30 solids referred to as mature fine tailings
Success StoriesExtraction and Tailings
The consolidated tailings or non segregating tailings processes are two success stories that promise to reduce the amount of water used to produce a barrel of bitumen and at the same time create a solid landscape where the fluid fine tailings can be reclaimed as the original boreal forest These are not the only technologies available and our
Oil sands tailings pondsEnergy Education
The Oil sands tailings ponds are settling ponds that contain the waste byproduct of oil sands extraction and upgrading They are a mix of water sand silt
Distinguishing Natural from Anthropogenic Sources of
oil sands tailings pond Here we build upon this work through further development and application of these techniques at two different study sites near two different tailings ponds in conjunction with the use of an additional isotopic tool sulfur isotope analysis δ34S of AEOs The combined use of both δ13C pyr and δ
Oil Sands Tailings Reclamation Goals the State of
Tailings A blend of MFT and sand used to dispose of fine tailings DDADedicated disposal area An area for disposal of fines to be reclaimed FFTFluid fine tailings The clay dominated fine mineral solids contained in the water run off from the mainly sand tailings discharged from the oil sands bitumen extraction process
Dewatering Wet Tailings Generated From Oil Sands
Bitumen extraction from surface minable Alberta oil sands using the Clark Hot Water Extraction Process CHWE consumes significant amounts of fresh water and generates large amounts of unconsolidated wet tailings On average to produce one barrel of bitumen 4 6 barrels of fresh water are required and 12 15 barrels of tailings wastes are
Tailings pondEnergy Education
Tailings are the gray material right of the water Tailings ponds are one of the methods used to store tailings the waste material left over from ore extraction processes Tailings are often mixed with water to create a slurry which is easier to transport One method of storing the slurry is in tailings ponds
Tailings Reduction Technology Canada s Oil Sands
Tailings are the mixture of clay silt sand residual bitumen and water that remain after bitumen is extracted from the sand at oil sands mines This watery waste stream is transported by pipeline and deposited in ponds where the majority of the solids mostly sand settle to the bottom The remaining fluid mostly clay silt and
The Ponds Oil sands extraction makes a lot of waste
Since 1968 the oil sands tailings ponds have been growing by leaps and bounds and now hold a total of 5 5 billion cubic metres of waste and water About 70 per cent of that volume is water By 2020 Syncrude and Suncor alone will have added another billion cubic metres to the ponds
Alberta officials are signalling they have no idea how to
The ruses don t always work Every year an estimated 200 000 birds land on the oilsands industrial water bodies including tailings ponds according to a 2013 report by the University of Alberta s Oil Sands Monitoring Program It only takes a dime size drop of oil to kill a said Sarah Hechtenthal a wildlife biologist
An Integrated Model for Oil Sands Long Term Mine
Different types of tailings are the main unwanted by products of oil sands processing Huge volume of fresh and recycled water used in bitumen extraction process results in extensive ponds that are constructed to hold tailings slurry Since the available area for tailings dam construction is limited
New approaches for extracting and recovering metals from
Mineral tailings from two copper mines were bioleached under different conditions Greatest copper extraction was achieved at extremely low pH at 45 C and under oxidative/reductive conditions Copper present in tailings PLS was selectively precipitated as CuS by biogenic H 2 S Microbial communities were dominated by Sb thermosulfidooxidans and Acidithiobacillus spp
Tailings ponds What they re made ofOil Sands Question
Tailings ponds attract a lot of attention because there is currently about 77 square kilometres of oil sands tailings pond water in Alberta according to the Government of Alberta So while most people have heard of tailings ponds and seen photos few know what purpose they serve and what the ponds
Tailings Ponds Dust Control Global Environmental Solutions
Tailings Ponds Tailings Ponds are tricky They can be very dangerous Once dried out tailings ponds hold huge quantities of dust that may contain any one of the dozen or so nasty chemicals that mines use to extract the precious metals from ores It could be heavy metals or maybe even PCBs In other words an environmental disaster waiting to
Birds and Tar Sands Tailings Ponds
extend the open water season of the ponds or by adding decoys We think the emphasis should be on much stronger regulations that would see the long overdue removal of leg acy tailings from the landscape As well the outstanding McClelland Lake wetland com By Carolyn Campbell AWA Conservation Specialist Birds and Tar Sands Tailings Ponds
Tailings pondEnergy Education
Tailings ponds are one of the methods used to store tailings the waste material left over from ore extraction processes Tailings are often mixed with water to create a slurry which is easier to transport One method of storing the slurry is in tailings ponds Figure 1 Depending on the design of the pond this may or may not also include the use of a tailings dam which is often partially
DEVELOPMENT OF AN ENHANCED OIL SANDS FLUID
Bitumen extraction from surface mined oil sands results in the production of large volumes of Fluid Fine Tailings FFT Through Directive 085 the Province of Alberta has signaled that oil sands operators must improve and accelerate the methods by which they
Emissions from oil sands tailings ponds Review of
There has been an increase in air pollutant emissions from oil sands industrial activities within the AOSR related to the mining and extraction of the oil sands and tailings ponds Simpson et al 2010 Thorough characterization of tailings and their emissions have yet to be conducted due to their seasonal and temporal variability and