Effect of cement kiln dust, lime and fly ash on metal leaching characteristics of oil sands tailings from Alberta, Canada

Mohsen Saeedi, Mahmoud Mahmoud


DOI: https://doi.org/10.14710/9.2.6-13

Abstract


The oil sands industry of Alberta generates huge amounts of tailings in a slurry form that typically require up to 40 years to consolidate in very large tailings ponds which are up to 150 m in height.  Cement kiln dust (CKD), a byproduct of the ordinary Portland cement manufacturing process, as well as lime and fly ash, collectively referred to as geopolymers, may have the potential to reduce the tailings slurry consolidation period from 40 years, thus affecting the sustainability of such tailings facilities.  However, first, it must be demonstrated that these geopolymers will also decrease the metal leaching from thickened tailings (TT) and mature fine tailings (MFT) from the oil sands industry. This study was focused on the use of geopolymers to reduce the environmental impact of TT- and MFT-tailings in the Alberta oil sands industry. Toxicity characteristics leaching procedure (TCLP) and static leaching test (SLT) was used to examine the leaching of metals from tailings, with the SLT test effectively mimicking the leaching process in the tailings ponds environment. Under non-acidic conditions corresponding to the SLT test results, iron concentrations with values of about 530-705 ppm were found to be lower than previous studies on oil sand tailing ponds (2400 ppm).  Results showed that geopolymer amendment of TT and MFT significantly reduced the leaching of heavy metals.  SLT tests showed that amendment of MFT with 7% CKD decreased Pb, Mn, and Fe leaching, whereas TT-amended with 4% CKD decreased Cu, Pb, Zn, Mn, and Fe. Overall, the CKD amendment of TT showed more than 95% efficiency in the reduction of leaching of all heavy metals.  In TCLP tests, TT-amended with 2% FA decreased the leaching of Pb and Ni to acceptable levels with substantial efficiency in reducing the leaching of Fe, Cu, and Zn. TCLP tests also showed that among different amendments, TT-amended with 4% CKD or 2% FA were the most effective proportions for controlling metal leaching from TT, while MFT-amended with 7% lime/FA or 3% CKD were the effective proportions for reducing metal leaching from MFT. Thus, it is deduced that CKD at 3%-4% w/w amendment would work best for reducing leachate levels of both TT and MFT.  While amendment of tailings by means of a combination of fly ash and lime also were effective in reducing the leaching of metals, these two geopolymers were not as effective as the CKD amendment.

 


Keywords


Oil sands industry; thickened tailings; mature fine tailings; geopolymers; CKD; heavy metals; leaching tests

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References


BGC Engineering Inc., “Oil Sands Tailings Technology Review.,” 2010. https://era.library.ualberta.ca/items/d54a3e22-cf15-4c3b-baeb-2ee10578a259/view/ad8166dd-861d-4162-afac-949a5ac82582/Tailings-20Technology-20Review-20--202010-2007-2019.pdf (accessed Apr. 04, 2020).

E. W. Allen, “Process water treatment in Canada’s oil sands industry: I. Target pollutants and treatment objectives,” J. Environ. Eng. Sci., vol. 7, no. 2, pp. 123–138, Mar. 2008, doi: 10.1139/S07-038.

S. Lane, “Lime coagulation and stabilization of total oil sands tailings,” Annu. CIM Pet. Soc., vol. 83-34–33, Jan. 1983, Accessed: Apr. 04, 2020. [Online]. Available: https://www.osti.gov/biblio/6141594-lime-coagulation-stabilization-total-oil-sands-tailings.

S. Ahmari and L. Zhang, “Utilization of cement kiln dust (CKD) to enhance mine tailings-based geopolymer bricks,” Constr. Build. Mater., vol. 40, pp. 1002–1011, Mar. 2013, doi: 10.1016/j.conbuildmat.2012.11.069.

P. Duxson, A. Fernández-Jiménez, J. L. Provis, G. C. Lukey, A. Palomo, and J. S. J. van Deventer, “Geopolymer technology: the current state of the art,” J. Mater. Sci., vol. 42, no. 9, pp. 2917–2933, May 2007, doi: 10.1007/s10853-006-0637-z.

F. Pacheco-Torgal, J. P. Castro-Gomes, and S. Jalali, “Investigations of tungsten mine waste geopolymeric binder: Strength and microstructure,” Constr. Build. Mater., vol. 22, no. 11, pp. 2212–2219, Nov. 2008, doi: 10.1016/j.conbuildmat.2007.08.003.

S. Ahmari, L. Zhang, and J. Zhang, “Effects of activator type/concentration and curing temperature on alkali-activated binder based on copper mine tailings,” J. Mater. Sci., vol. 47, no. 16, pp. 5933–5945, Aug. 2012, doi: 10.1007/s10853-012-6497-9.

S. Ahmari and L. Zhang, “Production of eco-friendly bricks from copper mine tailings through geopolymerization,” Constr. Build. Mater., vol. 29, pp. 323–331, Apr. 2012, doi: 10.1016/j.conbuildmat.2011.10.048.

M. Mahmoud and B. Rimes, “Leaching characteristics of Cement Kiln Dust from Alberta.” CSCE Conference, Edmonton, Alberta, Canada., 2012.

M. Nehdi and A. Tariq, “Stabilization of sulphidic mine tailings for prevention of metal release and acid drainage using cementitious materials: a review,” J. Environ. Eng. Sci., vol. 6, no. 4, pp. 423–436, Jul. 2007, doi: 10.1139/s06-060.

Baghdadi Z. A., Fatani M. N., and Sabban N. A., “Soil Modification by Cement Kiln Dust,” J. Mater. Civ. Eng., vol. 7, no. 4, pp. 218–222, Nov. 1995, doi: 10.1061/(ASCE)0899-1561(1995)7:4(218).

W. S. Adaska, P.E. and D. H. Taubert, “Beneficial Uses of Cement Kiln Dust,” in 2008 IEEE Cement Industry Technical Conference Record, May 2008, pp. 210–228, doi: 10.1109/CITCON.2008.24.

O. S. Khanna, “Characterization and Utilization of Cement Kiln Dusts (CKDs) as Partial Replacements of Portland Cement,” p. 344, 2009.

G. A. Miller and S. Azad, “Influence of soil type on stabilization with cement kiln dust,” Constr. Build. Mater., vol. 14, no. 2, pp. 89–97, Mar. 2000, doi: 10.1016/S0950-0618(00)00007-6.

A. Tariq and E. K. Yanful, “A review of binders used in cemented paste tailings for underground and surface disposal practices,” J. Environ. Manage., vol. 131, pp. 138–149, Dec. 2013, doi: 10.1016/j.jenvman.2013.09.039.

R. Alam, J. Q. Shang, and S. Islam, “Electrophoresis and its applications in oil sand tailings management,” Int. J. Miner. Process., vol. 161, pp. 41–49, Apr. 2017, doi: 10.1016/j.minpro.2017.02.006.

T. M. Bajwa, “Microstructure and macroscopic behaviour of polymer amended oil sands mature fine tailings,” Text, Carleton University, 2015.

A. Roshani, M. Fall, and K. Kennedy, “Drying Behavior of Mature Fine Tailings Pre-Dewatered With Super-Absorbent Polymer (SAP): Column Experiments,” Geotech. Test. J., vol. 40, no. 2, pp. 210–220, Feb. 2017, doi: 10.1520/GTJ20160034.

Y. Yao, “Dewatering Behaviour of Fine Oil Sands Tailings: An Experimental Study,” 2016, doi: 10.4233/uuid:1ac8f35b-0738-42b4-8ae2-5a5f68941814.

H. Liu, S. Tan, T. Yu, and Y. Liu, “Sulfate reducing bacterial community and in situ activity in mature fine tailings analyzed by real time qPCR and microsensor,” J. Environ. Sci. China, vol. 44, pp. 141–147, Jun. 2016, doi: 10.1016/j.jes.2015.08.025.

S. Nusri, X. Tan, P. Choi, and Q. Liu, “Using surface geopolymerization reactions to strengthen Athabasca oil sands mature fine tailings,” Can. J. Chem. Eng., vol. 94, no. 9, pp. 1640–1647, 2016, doi: 10.1002/cjce.22548.

Y. Zhang, “Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT),” ERA, Spring 2012. https://era.library.ualberta.ca/items/a31698f9-dec7-40a2-b6a3-5ab15b752621 (accessed Apr. 09, 2020).

Y. Zhu, X. Tan, and Q. Liu, “Dual polymer flocculants for mature fine tailings dewatering,” Can. J. Chem. Eng., vol. 95, no. 1, pp. 3–10, 2017, doi: 10.1002/cjce.22628.

O. US EPA, “SW-846 Test Method 1311: Toxicity Characteristic Leaching Procedure,” US EPA, Dec. 08, 2015. https://www.epa.gov/hw-sw846/sw-846-test-method-1311-toxicity-characteristic-leaching-procedure (accessed Apr. 16, 2020).

Canadian Council of Ministers of the Environment (CCME), “Canadian Water Quality Guidelines.” 2008.

MacKinnon, “A comparison of the physical and chemical properties of the tailings ponds at the Syncrude and Suncor oil sands plants,” 1993. .

Canadian Council of Ministers and of the Environment (CCME), “Canadian Environmental Quality Guidelines,” 2005. https://www.ccme.ca/en/resources/canadian_environmental_quality_guidelines/ (accessed May 14, 2020).

O. US EPA, “National Recommended Water Quality Criteria,” US EPA, Feb. 11, 2014. https://www.epa.gov/wqc/national-recommended-water-quality-criteria (accessed May 14, 2020).

M. H. El-Awady and T. M. Sami, “Removal of heavy metals by cement kiln dust,” Bull. Environ. Contam. Toxicol., vol. 59, no. 4, pp. 603–610, Oct. 1997, doi: 10.1007/s001289900522.

A. Pigaga, R. Juškenas, D. Virbalytė, M. G. Klimantavičiūtė, and V. Pakštas, “The use of cement kiln dust for the removal of heavy metal ions from aqueous solutions,” Trans. IMF, vol. 83, no. 4, pp. 210–214, Aug. 2005, doi: 10.1179/002029605X61685.

N. G. Zaki, I. A. Khattab, and N. M. Abd El-Monem, “Removal of some heavy metals by CKD leachate,” J. Hazard. Mater., vol. 147, no. 1, pp. 21–27, Aug. 2007, doi: 10.1016/j.jhazmat.2006.12.057.

O. E. Abdel Salam, N. A. Reiad, and M. M. ElShafei, “A study of the removal characteristics of heavy metals from wastewater by low-cost adsorbents,” J. Adv. Res., vol. 2, no. 4, pp. 297–303, Oct. 2011, doi: 10.1016/j.jare.2011.01.008.

H. Cho, D. Oh, and K. Kim, “A study on removal characteristics of heavy metals from aqueous solution by fly ash,” J. Hazard. Mater., vol. 127, no. 1, pp. 187–195, Dec. 2005, doi: 10.1016/j.jhazmat.2005.07.019.




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