Kumari, Jyoti and Agarwalla, Hridesh and Gangopadhyay, Monalisa and Masto, Reginald Ebhin and Senapati, Rabinarayan and Kumar, Manish (2026) Investigation into pre-combustion mercury removal in high-ash Indian coal using float-sink and rapid pyrolysis. International Journal of Coal Preparation and Utilization.

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Abstract

Coal combustion is the second largest source of anthropogenic mercury emissions globally. Power plants commonly use conventional air pollution control devices (APCDs) for post-combustion flue gas cleaning to mitigate these emissions. However, pre-combustion techniques provide a promising alternative by targeting mercury removal before combustion. Pre-combustion Hg removal methods, such as physical coal cleaning and mild pyrolysis, demonstrate significant potential for reducing emissions, with their efficiency largely influenced by the mode of Hg association within the coal. In this study, the Hg removal efficiency of two pre-combustion techniques, sink-float density separation and rapid pyrolysis was investigated for a high-ash Indian coal. Results showed that mild pyrolysis at 350–400°C achieved a significant Hg removal without substantial mass loss. Conversely, the float-sink method revealed uneven Hg distribution in the floats, leading to low Hg removal efficiency. The low yield of clean coal makes this method less attractive. This inefficiency in Hg separation during float-sink processing is likely due to the inherent inorganic constituent content in Indian coal and the dependence of Hg removal on its mode of occurrence, as well as the size and type of pyrite grains in the coal.

Item Type:	Article
Uncontrolled Keywords:	Mercury coal pre-combustion Hg removal pyrolysis float and sink
Subjects:	Coal Characterisation
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	12 May 2026 11:49
Last Modified:	12 May 2026 11:49
URI:	https://cimfr.csircentral.net/id/eprint/3020

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