Li, D, Liu, B, He, J, Li, X & Jian, M 2017, 'Strength and transportability of cemented phosphogypsum paste backfilling slurry', in A Wu & R Jewell (eds), Proceedings of the 20th International Seminar on Paste and Thickened Tailings
, University of Science and Technology Beijing, Beijing, pp. 328-336, https://doi.org/10.36487/ACG_rep/1752_36_Li
In order to investigate the strength of cemented phosphogypsum (PG) backfill, a batch of PG backfilling slurry with different concentrations were tested at different curing times. Furthermore, a full-scale pipe test loop system was also established to investigate the pressure drop of the paste slurry with varied slurry concentrations and mix proportions flowing through the pipes. The test results showed that the compressive strength of the cemented PG backfill specimens was influenced by the ratio of the cementitious material to PG, the slurry concentration and the curing time. For example, under 28 days of curing time, the compressive strength of the cemented PG backfill specimens with the slurry concentration of 68wt%, mixed with the ratio of cementitious material to PG being 1:2, can reach 3.4 MPa. Based on the pipe test loop system, the fitting calculation formulas for the pressure drop of cemented PG paste backfill slurry (CPPB) with two ratios of cementitious materials to PG (1:4 and 1:5) flowing in horizontal straight pipes have been put forward. A field test was also conducted that proved the reliability of the fitting calculation formula.
Akın, A.İ. and Sert, Y. 2004, 'Utilization of weathered phosphogypsum as set retarder in portland cement', Cement and Concrete Research, vol. 34, issue 4, pp. 677-680.
Amaratunga, L.M. and Yaschyshyn, D.N. 1997, 'Development of a high modulus paste fill using fine gold mill tailings', Geotechnical & Geological Engineering, vol. 15, issue 3, pp. 205-219.
Carbonell, B.A., DeLaune, R.D. and Jugsujinda, A. 2002, 'Phosphogypsum chemistry under highly anoxic conditions', Waste Management, vol. 22, issue 6, pp. 657-665.
Chen, J.S., Zhao, B., Wang, X.M., Zhang, Q.L. and Wang, L. 2010, 'Cemented backfilling performance of yellow phosphorus slag', International Journal of Minerals, Metallurgy, and Materials, vol. 17, issue 1, pp. 121-126.
Değirmenci, N. 2008, 'Utilization of phosphogypsum as raw and calcined material in manufacturing of building products', Construction and Building Materials, vol. 22, issue 8, pp. 1857-1862
Fall, M., Benzaazoua, M. and Ouellet, S. 2004, 'Effect of tailings properties on paste backfill performance'. Proceedings of 8th International Symposia on Mining with Backfill, Beijing,China, pp. 193-202.
Fall, M., Benzaazoua, M. and Saa, E.G. 2008, 'Mix proportioning of underground cemented tailings backfill', Tunnelling and Underground Space Technology, vol. 23, issue 1, pp. 80-90.
Fall, M., Célestin, J.C., Pokharel, M. and Touré, M. 2010, 'A contribution to understanding the effects of curing temperature on the mechanical properties of mine cemented tailings backfill', Engineering Geology, vol. 114, issue 3-4, pp. 397-413.
Hewitt, D., Allard, S. and Radziszewski, P. 2009, 'Pipe lining abrasion testing for paste backfill operations', Minerals Engineering, vol. 22, issue 12, pp. 1088-1090.
Jiang, H., Fall, M. and Cui, L. 2016, 'Yield stress of cemented paste backfill in sub-zero environments: experimental results', Minerals Engineering, vol. 92, pp. 141-150.
Kesimal, A., Yilmaz, E., Ercikdi, B., Alp, I. and Deveci, H. 2005, 'Effect of properties of tailings and binder on the short-and long-term strength and stability of cemented paste backfill', Materials Letters, vol. 59, issue 28, pp. 3703-3709.
Lebedeva, O.E., Dubovichenko, A.E., Kotsubinskaya, O.I. and Sarmurzina, A.G. 2000, 'Preparation of porous glasses from phosphorus slag', Journal of Non-Crystalline Solids, vol. 277, issue 1, pp. 10-14.
Li, X., Zhou, Z., Zhao, G. and Liu, Z. 2008, 'Utilization of phosphogypsum for backfilling, way to relieve its environmental impact', Gospodarka Surowcami Mineralnymi, vol. 24, issue 4, pp. 225-231.
Mun, K.J., Hyoung, W.K., Lee, C.W., So, S.Y. and Soh, Y.S. 2007, 'Basic properties of non-sintering cement using phosphogypsum and waste lime as activator', Construction and Building Materials, vol. 21, issue 6, pp. 1342-1350.
Parreira, A.B., Kobayashi, A.R.K. and Silvestre, O.B. 2003, 'Influence of portland cement type on unconfined compressive strength and linear expansion of cement-stabilized phosphogypsum', American Society of Civil Engineers, vol. 129, issue 10, pp. 956-960.
Pokharel, M. and Fall, M. 2013, 'Combined influence of sulphate and temperature on the saturated hydraulic conductivity of hardened cemented paste backfill', Cement and Concrete Composites, vol. 38, pp. 21-28.
Tayibi, H., Choura, M., Lopez, F.A., Alguacil, F.J. and Lopez-Delgado, A. 2009, 'Environmental impact and management of phosphogypsum', Journal of environmental management, vol. 90, issue 8, pp. 2377-2386.
Wang, H., Wang, Y., Wu, A., Zhai, Y. and Jiao, H. 2011, 'Research of paste new definition from the viewpoint of saturation ratio and bleeding rate', Journal of Wuhan University of Technology, vol. 33, issue 6, pp. 85-89.
Wu, D., Yang, B. and Liu, Y. 2015, 'Pressure drop in loop pipe flow of fresh cemented coal gangue-fly ash slurry: Experiment and simulation', Advanced Powder Technology, vol. 26, issue 3, pp. 920-927.
Wu, D., Yang, B. and Liu, Y. 2015, 'Transportability and pressure drop of fresh cemented coal gangue-fly ash backfill (CGFB) slurry in pipe loop', Powder Technology, vol. 284, pp. 218-224.
Yang, J., Liu, W., Zhang, L. and Xiao, B. 2009, 'Preparation of load-bearing building materials from autoclaved phosphogypsum', Construction and Building Materials, vol. 23, issue 2, pp. 687-693.
Yilmaz, E. 2010, 'Investigating the hydrogeotechnical and microstructural properties of cemented paste backfill using the CUAPS apparatus', Ph.D. Thesis. Universitédu Québec en Abitibi-Témiscamingue (UQAT).
Zhou, J., Gao, H., Shu, Z., Wang, Y. and Yan, C. 2012, 'Utilization of waste phosphogypsum to prepare non-fired bricks by a novel Hydration–Recrystallization process', Construction and Building Materials, vol.34, pp. 114-119.