XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3469
REFERENCES
[1] Alam N, Ozdemir O, Hampton MA, Nguyen AV.
Dewatering of coal plant tailings: Flocculation fol-
lowed by filtration. Fuel. 2011 90:26–35.
[2] Loerke R, Tan X, Liu Q. Dewatering of oil sands
mature fine tailings by dual polymer floccula-
tion and pressure plate filtration. Energy &Fuels.
2017 31:6986–95.
[3] Furnell E, Bilaniuk K, Goldbaum M, Shoaib M, Wani
O, Tian X, et al. Dewatered and stacked mine tailings:
a review. ACS ES&T Engineering. 2022 2:728–45.
[4] Kaswalder F, Cavalli D, Hawkey A, Paglianti A.
Tailings dewatering by pressure filtration: Process
optimisation and design criteria. Paste 2018:
Proceedings of the 21st International Seminar on
Paste and Thickened Tailings: Australian Centre for
Geomechanics 2018. p. 427–38.
[5] Gregory J, O’Melia CR. Fundamentals of floccula-
tion. Critical Reviews in Environmental Science and
Technology. 1989 19:185–230.
[6] Nasser M, James A. Effect of polyacrylamide polymers
on floc size and rheological behaviour of kaolinite sus-
pensions. Colloids and Surfaces A: Physicochemical
and Engineering Aspects. 2007 301:311–22.
[7] Nasser M, James A. The effect of polyacrylamide
charge density and molecular weight on the floc-
culation and sedimentation behaviour of kaolinite
suspensions. Separation and purification technology.
2006 52:241–52.
CONCLUSION
In this work, the dewatering of oil sands fine tailings was
investigated by flocculation followed by pressure filtra-
tion. The ferric chloride and polyethylene oxide (PEO)
were used as coagulants and flocculants, respectively. It
was found when tailing slurry was preconditioned with a
polyphenol compound, tannic acid (TA), the filtration effi-
ciency was enhanced significantly. The TA can reduce the
specific cake resistance to filtration, and it also increases the
mechanical properties of flocs with higher shear stress and
compressibility. The elemental analysis and UV-Vis spectra
demonstrate that TA could adsorb on solid surfaces, and
interact with PEO and ferric through hydrogen bonding
and coordination. The formed polymeric complexes were
responsible for the enhancement of the floc structure and
benefited the dewatering of oil sands tailings by pressure
filtration. This chemical conditioning strategy may also
apply to the dewatering of other fine tailing slurries in the
mining.
ACKNOWLEDGMENT
The authors acknowledge the financial support from
Imperial Oil Limited, Alberta Innovates, and Canada’s Oil
Sands Innovation Alliance (COSIA) through the Institute
for Oil Sands Innovation (IOSI 2020-03), and from the
Natural Sciences and Engineering Research Council of
Canada (NSERC) through an Alliance research project
grant (ALLRP563657-21).
Figure 9. Schematic illustration of coagulation-flocculation filtration with and without tannic acid
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XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3469
REFERENCES
[1] Alam N, Ozdemir O, Hampton MA, Nguyen AV.
Dewatering of coal plant tailings: Flocculation fol-
lowed by filtration. Fuel. 2011 90:26–35.
[2] Loerke R, Tan X, Liu Q. Dewatering of oil sands
mature fine tailings by dual polymer floccula-
tion and pressure plate filtration. Energy &Fuels.
2017 31:6986–95.
[3] Furnell E, Bilaniuk K, Goldbaum M, Shoaib M, Wani
O, Tian X, et al. Dewatered and stacked mine tailings:
a review. ACS ES&T Engineering. 2022 2:728–45.
[4] Kaswalder F, Cavalli D, Hawkey A, Paglianti A.
Tailings dewatering by pressure filtration: Process
optimisation and design criteria. Paste 2018:
Proceedings of the 21st International Seminar on
Paste and Thickened Tailings: Australian Centre for
Geomechanics 2018. p. 427–38.
[5] Gregory J, O’Melia CR. Fundamentals of floccula-
tion. Critical Reviews in Environmental Science and
Technology. 1989 19:185–230.
[6] Nasser M, James A. Effect of polyacrylamide polymers
on floc size and rheological behaviour of kaolinite sus-
pensions. Colloids and Surfaces A: Physicochemical
and Engineering Aspects. 2007 301:311–22.
[7] Nasser M, James A. The effect of polyacrylamide
charge density and molecular weight on the floc-
culation and sedimentation behaviour of kaolinite
suspensions. Separation and purification technology.
2006 52:241–52.
CONCLUSION
In this work, the dewatering of oil sands fine tailings was
investigated by flocculation followed by pressure filtra-
tion. The ferric chloride and polyethylene oxide (PEO)
were used as coagulants and flocculants, respectively. It
was found when tailing slurry was preconditioned with a
polyphenol compound, tannic acid (TA), the filtration effi-
ciency was enhanced significantly. The TA can reduce the
specific cake resistance to filtration, and it also increases the
mechanical properties of flocs with higher shear stress and
compressibility. The elemental analysis and UV-Vis spectra
demonstrate that TA could adsorb on solid surfaces, and
interact with PEO and ferric through hydrogen bonding
and coordination. The formed polymeric complexes were
responsible for the enhancement of the floc structure and
benefited the dewatering of oil sands tailings by pressure
filtration. This chemical conditioning strategy may also
apply to the dewatering of other fine tailing slurries in the
mining.
ACKNOWLEDGMENT
The authors acknowledge the financial support from
Imperial Oil Limited, Alberta Innovates, and Canada’s Oil
Sands Innovation Alliance (COSIA) through the Institute
for Oil Sands Innovation (IOSI 2020-03), and from the
Natural Sciences and Engineering Research Council of
Canada (NSERC) through an Alliance research project
grant (ALLRP563657-21).
Figure 9. Schematic illustration of coagulation-flocculation filtration with and without tannic acid

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