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Energies 2015, 8(3), 1917-1935; doi:10.3390/en8031917

Heat Recovery from High Temperature Slags: A Review of Chemical Methods

Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, China
Author to whom correspondence should be addressed.
Academic Editor: Mehrdad Massoudi
Received: 3 December 2014 / Revised: 13 January 2015 / Accepted: 5 March 2015 / Published: 12 March 2015
(This article belongs to the Special Issue Recent Advances in Coal Combustion and Gasification)
View Full-Text   |   Download PDF [652 KB, uploaded 17 March 2015]   |  


Waste heat recovery from high temperature slags represents the latest potential way to remarkably reduce the energy consumption and CO2 emissions of the steel industry. The molten slags, in the temperature range of 1723–1923 K, carry large amounts of high quality energy. However, the heat recovery from slags faces several fundamental challenges, including their low thermal conductivity, inside crystallization, and discontinuous availability. During past decades, various chemical methods have been exploited and performed including methane reforming, coal and biomass gasification, and direct compositional modification and utilization of slags. These methods effectively meet the challenges mentioned before and help integrate the steel industry with other industrial sectors. During the heat recovery using chemical methods, slags can act as not only heat carriers but also as catalysts and reactants, which expands the field of utilization of slags. Fuel gas production using the waste heat accounts for the main R&D trend, through which the thermal heat in the slag could be transformed into high quality chemical energy in the fuel gas. Moreover, these chemical methods should be extended to an industrial scale to realize their commercial application, which is the only way by which the substantial energy in the slags could be extracted, i.e., amounting to 16 million tons of standard coal in China. View Full-Text
Keywords: high temperature slag; waste heat recovery; chemical methods; fuel gas production high temperature slag; waste heat recovery; chemical methods; fuel gas production

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sun, Y.; Zhang, Z.; Liu, L.; Wang, X. Heat Recovery from High Temperature Slags: A Review of Chemical Methods. Energies 2015, 8, 1917-1935.

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