Separation of coal combustion residue for critical element extraction and other bulk uses

Karan, Kanishk Kumar and Masto, R. Ebhin and Agarwalla, Hridesh and Bari, Siddharth and Kumar,, Manish and Gopinathan, P. and Hazra, Bodhisatwa and Saha, Sujan and Maitya, Sudip (2023) Separation of coal combustion residue for critical element extraction and other bulk uses. Environmental Science: Advances. ISSN 0723-2632

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Abstract

The demand for critical and rare earth elements is surging and coal combustion residue could be analternate source of critical elements. Data on the concentration of critical and rare earth elements (REYs)in diﬀerent size fractions of ﬂy ash would help in segregation of the ash. This study was conducted withthe objective of examining the possibility of separation of coal ash into a size fraction useful for element extraction and the rest for bulk uses like cement, concrete, landﬁll, roads, embankments, etc. The concentration of critical elements, their partitioning in diﬀerent size ash particles (>500 to <25 mm), and their chemical association were determined for a coal ﬂy ash sample from Talcher, India. The total REY concentration in the ash varied between 440 and 529 mg kg−1, wherein the contents were relatively higher for Nd (75–103 mg kg−1) followed by Ce (58.3–88.7 mg kg−1), La (41.6–80.3 mg kg−1), Sm (39.0–79.3 mg kg−1), and Y (38.4–49.3 mg kg−1). The REY outlook coeﬃcient of the raw ash (1.03) is more than0.7 and accordingly this ﬂy ash can be considered as an interesting source of rare earth elements. This factor was further enhanced to 2.3 in the coarse ash particles of size > 250 mm. Sequential extraction showed that most of the rare and critical elements are associated with the alumino-silicate matrix. TheAl2O3content of this ash is relatively high (25%), so there is scope for co-extraction of Al along with the rare earth elements. The ash disposal and utilization policy should consider the separation and preservation of the coarse ash fraction (>250 mm) for the extraction of critical and rare earth elements

Item Type:	Article
Subjects:	Coal Characterisation
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	08 Jan 2024 06:57
Last Modified:	29 Jan 2024 05:13
URI:	http://cimfr.csircentral.net/id/eprint/2655

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