DOI: 10.5176/2251-3361_GEOS12.67
Authors: Dr. Devi Prasad Mishra
Abstract: Fly ash, the coal combustion by-products (CCBs) are produced in large quantities from the coal-fired power stations every year and relatively a small proportion of it finds application in multifarious fields. Disposal of high volume of unutilized fly ash requires vast area of land and causes significant economic and environmental problems. Finding out an effective means of bulk utilization of fly ash has been an important concern for the government, environmentalists and researchers. It has been recognized that use of fly ash in mine backfilling or stowing has got tremendous potential for its bulk utilization. Numerous literatures illustrate the findings of researchers regarding the suitability of fly ash for mine backfilling/stowing. This paper describes the physico-chemical and mineralogical properties of fly ash for assessing its suitability for the mine stowing application. In addition, the worldwide utilization status of fly ash as a novel material in mine stowing is presented in this article with an aim to make a wide publicity for its bulk utilization. The problems associated with the hydraulic stowing of coal fly ash and the need for further research to overcome these problems for effective fly ash stowing are also highlighted in this paper.
Keywords: coal combustion by-products; fly ash; pond ash; characterization; utilization; hydraulic stowing
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