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Energy recovery from high temperature slags

Author

Listed:
  • Barati, M.
  • Esfahani, S.
  • Utigard, T.A.

Abstract

Molten slags represent one of the largest untapped energy sources in metal manufacturing operations. The waste heat of slags amounting to ∼220 TWh/year at temperatures in the range of 1200–1600 °C, presents an opportunity to lower the energy intensity of metal production. Currently, three types of technologies are under development for utilizing the thermal energy of slags; recovery as hot air or steam, conversion to chemical energy as fuel, and thermoelectric power generation. The former route is most developed with its large scale trials demonstrating recovery efficiencies up to 65%. The latter two are emerging as the next generation methods of waste heat recovery. An evaluation of these methods shows that for both thermal and chemical energy recovery routes, a two-step process would yield a high efficiency with minimal technical risk. For thermoelectric power generation, the use of phase change materials appears to solve some of the current challenges including the mismatch between the slag temperature and operating range of thermoelectric materials.

Suggested Citation

  • Barati, M. & Esfahani, S. & Utigard, T.A., 2011. "Energy recovery from high temperature slags," Energy, Elsevier, vol. 36(9), pages 5440-5449.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:9:p:5440-5449
    DOI: 10.1016/j.energy.2011.07.007
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    References listed on IDEAS

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    1. Barati, Mansoor, 2010. "Energy intensity and greenhouse gases footprint of metallurgical processes: A continuous steelmaking case study," Energy, Elsevier, vol. 35(9), pages 3731-3737.
    2. Bisio, G., 1997. "Energy recovery from molten slag and exploitation of the recovered energy," Energy, Elsevier, vol. 22(5), pages 501-509.
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