FLY ASH MIXING WITH MINE OB DUMPS: AN ENVIRO-FRIENDLY, CLEAN AND GREEN METHOD OF DISPOSAL

Authors

  • Dewangan P K Associate Prof. and Head, Deptt. of Mining Engineering, NIT, Raipur, C.G., India
  • Lokhande R. D Assistant Professor, Visvesvaraya National Institute of Technology, Nagpur, India
  • Agarwal A K Assistant Professor, Visvesvaraya National Institute of Technology, Nagpur, India
  • Patel R Student, B.Tech., Final Year, Mining Engg, NIT, Raipur
  • Bhargav H Student, B.Tech., Final Year, Mining Engg, NIT, Raipur

DOI:

https://doi.org/10.20319/mijst.2017.32.105121

Keywords:

Stability, Overburden Dumps, Fly Ash, Shear Strain, Plasticity

Abstract

Fly ash generation, its utilization and safe disposal is a major problem faced by thermal power plants (TPP) in India. Despite several efforts of the government, the utilization of fly ash is reached to only 55% of the total fly ash generated and remaining 45% fly ash is still being dumped into poorly designed and maintained ash ponds. At present, fly ash is mainly being utilized for making cement, bricks, concrete, roads and small quantity in mine void filling. The consumption of fly ash in construction activity has reached to almost saturation level and there is not much potential to consume more fly ash in these segments. Mine void filling is the only potential area where bulk quantity of fly ash can be utilized and 100% utilization target can be achieved. This paper investigates the suitability of fly ash to be disposed off by mixing it with overburden (OB) dumps in coal mines. Characterization of both the OB dump material and fly ash were carried out in the laboratory. The compaction and shear tests were performed on OB dump material and the same mixed with 25% fly ash by volume as per the guidelines issued by Ministry of Environment Forest and Climate Change, Govt. of India. The stability condition of both OB dump and fly ash mixed OB dump at varying slope angles were analyzed using FLAC 3D slope stability software and dump angle were optimized for safe disposal of the fly ash.

References

Bell, F.G. (1996). Lime stabilization of clay minerals and soils. Engineering Geology, 42, 223–237 https://doi.org/10.1016/0013-7952(96)00028-2

Ministry of Power, (2015). Annual Report. Central Electricity Authority (CEA). New Delhi, Retrieved from httpp://cea.nic.in

Ministry of Power, (2016). Annual Report. Central Electricity Authority (CEA). New Delhi, Retrieved from httpp://powermin.nic.in

Chattopadhyay, G.C. (2015). Issues in utilization of ash by thermal power plants in the country. Journal of Government Audit and Accounts, 3,1-4

Dewangan, P. K., Pradhan, M. and Ramtekkar, G. D. (2016). Shear strength behaviour of fly ash mixed coal mine overburden dump material and stability assessment using numerical modelling. ARPN Journal of Engineering and Applied Science, 11(1), 615-628

Gupta A. K. and Paul B. (2016). Augmenting the stability of OB dump by using fly ash: A geotechnical approach to sustainably manage OB dump at Jharia Coalfield, India. Current World Environment, 11(1), 204-211 https://doi.org/10.12944/CWE.11.1.25

IS: 2720, Part 39, Section 1. (1977). Direct shear test for soil containing gravel more than 4.75 mm size. Indian Standard Methods of Test for Soils, Bureau of Indian Standards, New Delhi, 1-17

IS: 2720, Part 3, (1980). Determination of specific gravity. Indian Standard Methods of Test for Soils, Bureau of Indian Standards, New Delhi, 1-8

IS: 2720, Part 7 (1980). Determination of water content-dry density relation using light compaction. Indian Standard Methods of Test for Soils, Bureau of Indian Standards, New Delhi, 1-8

IS: 10050 (1981). Method for determination of slake durability index of rock. Indian Standard Methods, Bureau of Indian Standards, New Delhi, 1-7

IS: 2720, Part 8 (1983). Laboratory determination of water content-dry density relation using heavy compaction. Indian Standard Methods of Test for Soils, Bureau of Indian Standards. New Delhi, 1-9

IS: 2720, Part 5 (1985). Determination of liquid and plastic limit. Indian Standard Methods of Test for Soils. Bureau of Indian Standards, New Delhi, 1-16

IS: 8764 (1998), Method for determination of point load strength index of rocks, Indian Standard Method. Bureau of Indian Standards, New Delhi, 1-10

Itasca Consulting Group Inc. (2005). Fast Lagrangian Analysis of Continua, Manual, Version 5.0, Minneapolis, ICG

Jayanthu, S., Das, S. K. and Equeenuddin, Sk. Md. (2012). Stability of fly ash and overburden material in opencast mines- A case study. Proceedings of International Conference on Chemical Civil and Environmental Engineering, Dubai, 24-25 March, 276-278

Krishnan, S.S. (2013). Fly ash utilization: A key policy pathway for low carbon inclusive growth. Proceedings of 2nd Annual International Summit on Fly ash Utilization, 9-10 October, 1-22

Lees, G. Abdelkader, M. O. and Hamdani, S. K. (1982). Effect of the clay fraction on some mechanical properties of lime–soil mixtures. J Inst Highw Eng, 11, 3–9

Ministry of Environment, Forest & Climate Change [MOEFCC]. (2009). The Gazette of India: Extraordinary Part II, Section 3 (ii), notification dt. 3rd Nov., New Delhi, Govt. of India.

Pandey, V. C., Singh, J. S., Singh, R. P., Singh, N. and Yunus, M. (2011). Arsenic hazards in coal fly ash and its fate in Indian scenario. Resources Conservation and Recycling, 55, 819–835 https://doi.org/10.1016/j.resconrec.2011.04.005

Pradhan S. P., Vishal V., Singh T. N. and Singh V. K. (2014). Optimisation of dump slope geometry vis-a-vis fly ash utilization using numerical simulation. American Journal of Mining and Metallurgy, 2(1), 1-7

Singh, T.N. (2011). Assessment of coal mine overburden dump behaviour using numerical modelling. Proceedings of Rock Mechanics. Fuenkajorn & Phien-wej (eds), 25-36

Downloads

Published

2017-09-18

How to Cite

Dewangan, P., Lokhande, R., Agarwal, A., Patel, R., & Bhargav, H. (2017). FLY ASH MIXING WITH MINE OB DUMPS: AN ENVIRO-FRIENDLY, CLEAN AND GREEN METHOD OF DISPOSAL. MATTER: International Journal of Science and Technology, 3(2), 105–121. https://doi.org/10.20319/mijst.2017.32.105121