aw ter use and tailings management in surface mined … · 2014-01-08 · reserves and production...
TRANSCRIPT
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WATER USE AND TAILINGS MANAGEMENT IN SURFACE MINED OIL SANDS
Randy J. Mikula Kalium Research
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Edmonton
Calgary
Peace RiverFort
McMurray
Athabasca
Peace River
ColdLake
Alberta
Reserves and Production Summary 2005 (billions of barrels) EUB NR2006-
024
Bitumen Total
Resource 1,694
Reserve 179
Remaining Reserve 174
Annual production 0.388
Years of production 448
EUB ST98-2007
Mineable in situ
35 144
0.252 0.189
140 760
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Reserves and Production Summary 2009 (ERCB ST98-2010) in billions of barrels
Bitumen Total Mineable in situ
Resource 1,805 131 1,674
Reserve 176 38 138
Remaining Reserve 170 34 135
Annual Production .544 .302 .246
Years of Production 312 113 553
Approximately a 20% production increase in 2 years; 27 fewer years to reclaim
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The area occupied by the circle is approximately 400,000km2, and the area of the oil sands resource (in white) is approximately 141,000km2. Currently land disturbance due to oil sands development is about 600km2, with tailings containment about 180km2.
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Oil Sand
Bitumen
A lot of water is required to produce a barrel of
bitumen!
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Mineral
Bitumen
Water
Sand
Fines
Oil Sand Water
+
Fluid fine tails
Sand Tails
Bitumen product
Leftover water and mineral
RecycledWater
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Ore
Bitumen Froth
Wet Sand
Fluid Fine Tailings
Recycle Water
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The tailings containment structures are some of the largest man made features on the planet.
Dry stackable tailings technology is one way to reduce the volume of the accumulated fluid fine tailings. Dry stackable tailings implementation will allow for reclamation of the boreal forest, and reduce the water requirement from the Athabasca river.
Tailings Pond
Athabasca River
Lake Athabasca
Photo courtesy of NASA, space shuttle program
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From the Fine Tailings Symposium Proceedings, April 1993
Aerial photo from approximately 1987 when the “best available technology” was water capping of the accumulated fluid fine tailings or sludge.
CT/NST technology promised to increase water re-use from 75% to over 80%, but now even this improvement on the “best available technology” proposes to have an end pit lake containing leftover fluid fine tailings or MFT.
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Suncor Pond 1 Reclamation
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Suncor Pond 1 September 2010 (Wapisiw Lookout)
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Environmental issuesWater availability (river ecosystem)Lease storage volume limitations (land disturbance)
Economic issuesWater availability (collection and conservation of water)Lease storage volume limitations (sterilization of resource)
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Storage volume limitations will drive new tailings technologies as much as water availability. Without the implementation of some other dry stackable tailings
technology, long term storage volumes could become unsustainable.
The fate of water imported (CT implementation after year 20)
beach
mft
CT
recycle water
0.00E+00
5.00E+07
1.00E+08
1.50E+08
2.00E+08
2.50E+08
3.00E+08
3.50E+08
4.00E+08
1 4 7 10 13 16 19 22 25 28 31 34 37 40
Time in Years
Wat
er in
cub
ic m
eter
s
recycle water
CT
mft
beach
Dry Tailings
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The ability to characterize nano-scale oil sands components is critical to our ability to manipulate their properties and mitigate the environmental impact of oil sands tailings development.
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0.0
0.2
0.4
0.6
0.8
1.0R
elat
ive
Vol
umes
Oil Sand Water Sand MFT/TFT CT/NST RecycleWater
Process Streams
Bitumen
Water
SandFines
This much water must be added
This much water is lost
This much water is used for extraction
Water used for extraction: Approximately 12 barrels per barrel of bitumenWater Recycled: Approximately 70%Water lost to tailings: Approximately 4 barrels per barrel of bitumen
(this is for a typical ore)
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THE CT PROCESS
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Chemical Treatment
Fine Tailings30% Solids
+
Fresh Sand Tailings 70% Solids
ReleaseWater
DewateringDeposit
SegregatingMixture
CT Mixture
Pumpable Mixture
With the correct recipe, CT or NST is pumpable, but rapidly releases recycle water, leaving a trafficable surface for reclamation of the boreal forest. Without the correct recipe, the mixture will segregate, leaving a
fluid material unsuitable for reclamation.
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2006
1997
2007
The circled area represents the commercial version of the swimming pool experiment in the previous slide, and the photographs show the trafficable surface created. Water released from this pond was returned to the extraction process, reducing storage volumes and reducing withdrawal from the Athabasca river.
Commercial Scale CT at Suncor
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Carbon Dioxide CT
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Carbon Dioxide CT: Pilot Testing at Syncrude
CNRL is proposing to commercialize the CT/NST process using carbon dioxide as the chemical additive rather than gypsum.
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MFT DEWATERING
aka Thin Liftaka TROaka AFD
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Thin lift dewatering, Syncrude 2010
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Thin lift dewatering
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RIM DITCHING
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Rim Ditching on a lab scale
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Rim Ditching on a big scale:2009 Syncrude Test
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Rim Ditch September 2010
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Centrifuged fluid fine tailings
Increased water recycle Reduced volumeNo fluid storage requirementReclamation behind the mining operation
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20 t/h pilot test of dry stackable fluid fine tailings
“Conclusions from the 20t/hour pilot study were that not only is it possible to create a stackable total tailings, but the project was economically viable at year 2000 oil prices.Lessons learned during this study can be directly applicable to the Athabasca oil sands.” 2006 CIPC, Calgary
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Tailings stack being removed in preparation for another test run.
Centrifuged Tailings in Utah
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Aerial view of the 2008 Syncrude pilot demonstration of centrifuged fluid fine tailings
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Centrifuged Fluid Fine Tailings Pilot at Syncrude: Dry CakeAnother dry stackable tailings technology
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A new standard in fluid fine tailings dewatering: Syncrude Centrifuge Pilot cell #3
October issue of Alberta Oil Magazine
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Centrifuge 2010
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Bitumen in Tailings
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Rel
ativ
e V
olum
e
Oil Sand Water Sand MFT RecycleWater
Sand MFT DryStackableTailings:
CT Process
RecycleWater
Sand DryStackableTailings:
CentrifugeProcess
RecycleWater
Bitumen
WaterSandFines
The CT/NST Process
The Centrifuge Process
Historical Tailings Management
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SUMMARY
Several tailings management options are commercialized or have been demonstrated at close to commercial scale. Syncrude is leading the industry in understanding and scaling up all of these options.
Water conservation by the use of “dry stackable tailings” management options will have significant implications for the recycle water chemistry and we may have the opportunity to improve water quality from an environmental perspective.
The implementation of the ERCB Tailings Directive will be extremely challenging.
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Any Questions?