Kumari, Jyoti and Agarwalla, Hridesh and Gangopadhyay, Monalisa and Masto, Reginald Ebhin and Senapati, Rabinarayan and Kumar, Manish (2025) Distribution and mode of occurrence of mercury in Talcher and IB valley in India: insights on Hg environmental release and coal cleaning. Environmental Earth Sciences, 86. pp. 73-75. ISSN 1866-6280

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Abstract

Mercury is a global pollutant due to its toxicity, long range transfer and bioaccumulation. Coal combustion is one of the major sources of mercury in environment. Though the pre-combustion coal cleaning technologies for Hg removal have been advocated, the knowledge on the association of Hg with various components of coal is essential. Though in India, coal is the largest source of Hg emission, the mode of association of Hg is not well studied. In this article, various chemical association of mercury in coal sample from Talcher and Ib valley coalfield, India was studied in detail. The Hg concentration in the studied coal was 0.140 to 0.754 µg/g. Correlation studies show positive and significant correlation with total sulphur content, especially with pyritic and sulphate sulphur of coal. The sequential leaching study showed that majority of Hg was associated with pyritic fraction (57–84%) followed by clay (8–10%) and organic fraction (8–9%). Weathering of pyrites transformed a significant portion of Hg as HgSO4 and similar Hg containing iron-sulphate minerals. Pyritic association of Hg indicates that mild pyrolysis, density fraction, wet cleaning or a hybrid technology can be potential technique for Hg removal. However, a detailed techno commercial evaluation is needed between the alternative processes and the expected benefits of Hg cleaning.

Item Type:	Article
Uncontrolled Keywords:	Mercury Occurrence Coal Mercury removal Mercury contamination
Subjects:	Envieronmental Management Group
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	24 Jun 2025 07:43
Last Modified:	24 Jun 2025 07:43
URI:	http://cimfr.csircentral.net/id/eprint/2843

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