Study on the capacity of high-temperature melting technology to treat coal gasification fine slag and characterization of slag obtained

Li Zhou, Qiangqiang Ren, Chen Liang, Wenyu Wang and Wei Li

Energy, 2023, vol. 272, issue C

Abstract: Due to a lack of well-established industrial utilization technology, the large storage of coal gasification fine slag (CGFS) has caused environmental pollution and resource waste. The high-temperature melting (HTM) system can separate carbon from CGFS and make ash melt to form slag. In this study, the capacity of HTM with two different cooling structures in disposing massive CGFS was explored through bench-scale experiments, the resulting slag was characterized and the feasibility of slag as the starting material to prepare porous glass-ceramic through inorganic gel casting was studied. The rate of capturing slag and decarburization of the system with a molten bath are 88.60% and 91.00%, respectively, both better than the system with a radiation heat exchanger. As for the indicators of alkali activation potential for product slag, such as the content of unburned materials and vitreous phase, the system with the molten bath had a more optimistic performance. But the problems of low vitreous phase content and uneven composition are faced with it. In order to improve the ability of the slag to be alkali-activated, it is necessary to take measures to promote the full mixing of the melt and increase the cooling rate of the slag.

Keywords: Coal gasification fine slag; High-temperature melting technology; Porous glass-ceramic; Alkaline activation (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:272:y:2023:i:c:s0360544223005844

DOI: 10.1016/j.energy.2023.127190

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