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Dewangan, P. K.
- An Investigation in to Compaction, California Bearing Ratio and Shear Strength Behaviour of Coal Mine Overburden Dump Material Mixed With Fly Ash
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1 National Institute of Technology, Raipur, (C.G.), IN
1 National Institute of Technology, Raipur, (C.G.), IN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 4 (2017), Pagination: 770-779Abstract
Compaction, California Bearing Ratio (CBR) and shear strength behaviour of coal mine overburden dump material and fly ash mixed overburden dump material are studied by conducting a series of tests as per the standards. Test results are compared and analyzed to observe the changes occurred due to addition of fly ash and also to check the suitability of the mixture for various geotechnical applications viz. for road construction near captive coal mines and also as a fill material in the voids of open cast coal mines by mixing it with the overburden dumps. This investigation reveals that fly ash should be mixed in the range of 12.5% to 15% by mass (approx. 18% to 22% by volume) in the OB dumps, so that they can be compacted over a wide range of moisture content with very little variation in its unit weight. The test result also reveals that cohesion of OB dump material increases and friction angle reduces with the increase in fly ash content. The stress-strain behaviour of the overburden dump material and fly ash mixed overburden dump material exhibited post-peak softening behaviour.Keywords
Fly Ash, Overburden, Compaction, Shear Strength, CBR.References
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- Geotechnical, Environmental and Other Issues Pertaining to Fly Ash Disposal in Opencast Mine Voids
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Authors
Affiliations
1 Deptt. of Mining Engineering, NIT, Raipur, C.G, IN
1 Deptt. of Mining Engineering, NIT, Raipur, C.G, IN
Source
Journal of Mines, Metals and Fuels, Vol 68, No 1 (2020), Pagination: 25-32Abstract
The generation of huge quantity of fly ash and its utilization or safe disposal is the main concern affecting the efficient and economical working of thermal power plants (TPP) in India. Government of India is making continuous efforts and making stringent regulations to promote fly ash utilization and has given targets to all TPPs to achieve 100% utilization level. Despite various initiatives by Government, the utilization of fly ash is still around 63% and remaining 37% fly ash is poorly disposed off into ash ponds. Presently, major consumers of fly ash are for making cement, bricks, concrete and roads. The utilization of fly ash in all these activities has reached to almost saturation level. A very limited quantity of fly ash is being utilized by mines for backfilling of mine voids. One of the potential area for bulk disposal of fly ash is mine void filling which can help in achieving 100% utilization target. This paper discusses geotechnical, environmental and various operational and legal issues pertaining to fly ash disposal in opencast mine voids. Various methods of fly ash disposal in mine voids with successful implementation on a large scale in Indian opencast mines are discussed with a view to achieve 100% utilization target set by Ministry of Environment, Forest and Climate Change (MOEFCC), Government of India.Keywords
Backfilling, Stability, Leachates, Overburden Dumps, Fly Ash, Mine Voids.References
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- Study And Analysis of a Full-Scale Laboratory Successive Alkalinity Producing System for Iron Removal During the Treatment of Acid Mine Drainage
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Authors
Affiliations
1 Department of Mining Engineering, National Institute of Technology, Raipur 492010, IN
1 Department of Mining Engineering, National Institute of Technology, Raipur 492010, IN
Source
Journal of Mines, Metals and Fuels, Vol 68, No 2 (2020), Pagination: 57-63Abstract
The Successive Alkalinity Producing System (SAPS) is widely accepted for the treatment of acid mine drainage (AMD). The effectiveness of SAPS depends upon many parameters such as hydraulic retention time (HRT), influent quality, characteristics of organic substrate and their design aspects etc. In this laboratory SAPS column study, four synthetic AMD solutions were treated for 1 day, 2 days, 4 days, 7 days and 10 days HRTs to determine the performances of SAPS using cow compost as organic substrate, saw dust and lime stone in parallel in identical conditions. In this research, studies were carried out to find the effect of hydraulic retention time on iron removal and alkalinity generation by laboratory SAPS. The current results reveal that 100% iron a removal has been found. Higher rate of alkalinity generation was observed in initial reaction period; then it got slower down after passage of time. The encouraging results obtained on performance of laboratory scale set up of AMD is useful for large scale implementation in mines for treating AMD influent mine water and for design of various component of SAPS for its optimum performance.Keywords
Acid Mine Drainage, Passive Alkalinity Generation, Successive Alkalinity Producing System, HRT, ORP.References
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