Abstract—The present study has focused on the bulk utilisation of fly ash at the mining sites for the purpose of back filling by agglomerating the fly ash fines with the help of suitable binder and water. The use of fly ash as a stowing material has been justified by studying the physical, morphological, chemical and geotechnical properties of the fly ash. Rheology of the fly ash slurry has also been studied which deduced consumption of lot of water during its hydraulic transportation. To overcome the drawbacks, spherical granules have been prepared with the help of a Disc Pelletizer in which the requisite amount of water and binder (lime) have been finalised as 35% and 30% by weight of the fly ash. Granules have been obtained at various combinations of disc speed (35, 40, 45 RPM) and disc inclination (42°, 45°, 48°) and each combination has been analysed for Green Compressive Strength and Drop Number. It has been concluded that the granules prepared at 45RPM and 45° inclination gave the best results. This utilisation of fly ash granules for the purpose of mine back filling could effectively replace sand which has been conventionally used by providing better flowability, compaction and permeability.
Index Terms—Agglomeration, binder, drop number, green compressive strength, pelletisation, rheology.
Anamika Masoom and Manish Kumar Jain are with the Department of Environmental Science and Engineering, IIT (ISM), Dhanbad (e-mail: firstname.lastname@example.org, email@example.com).
Rayasam Venugopal is with the Department of Fuel & Mineral Engineering, IIT (ISM), Dhanbad.
Cite: Anamika Masoom, Manish Kumar Jain, and Rayasam Venugopal, "Preparation of Fly Ash Granules with Respect to Mine Filling," International Journal of Environmental Science and Development vol. 10, no. 4, pp. 104-109, 2019.