Distribution and leaching characteristics of metal elements in coal gasification fine Slag: Insights into inorganic and organic acid systems

Xu, Zhiqiang, Wang, Yujia, Qian, Yichi, Zhang, Jiafeng, Tu, Yanan, Gu, Suqian and Sun, Meijie 2025. Distribution and leaching characteristics of metal elements in coal gasification fine Slag: Insights into inorganic and organic acid systems. Separation and Purification Technology 361 (Part 2) , 131517. 10.1016/j.seppur.2025.131517

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Abstract

Coal gasification fine slag (CGFS) is rich in metal elements and represents a potential metal source. This study investigated entrained-flow gasification fine slag, examining the metal distribution characteristics, leaching behaviors of main metals in different leaching systems (hydrochloric, nitric, sulfuric, malic, and oxalic acid), and the leaching kinetics and mechanisms. XRD, XPS, NMR, and EPMA were employed to illustrate the mineralogical and chemical composition of CGFS. The chemical distribution of metals in CGFS was analyzed using a sequential extraction procedure. The results showed that most metals in CGFS were accumulated in amorphous aluminosilicates. Al and Fe were in a more stable state of assignment, while K, Ca, and Mg exhibited high mobility. The leaching experiments demonstrated that acid concentration significantly affected the inorganic acid leaching processes, while temperature was crucial for the organic acid leaching. The leaching processes in different systems followed the Avrami equation model with diffusion as the main rate-limiting process. The activation energies of metals were lowest in the oxalic acid system and were highest in the malic acid system. Additionally, the strong complexation ability of organic ions enhanced the leaching of metals. The results of this study indicated that the organic acid could be excellently applied to the leaching process of metals in CGFS, providing a theoretical basis and novel approach for extracting metals.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry Research Institutes & Centres > Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	1383-5866
Date of Acceptance:	7 January 2025
Last Modified:	04 Apr 2025 11:50
URI:	https://orca.cardiff.ac.uk/id/eprint/177324

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