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Sustainability 2017, 9(9), 1585; doi:10.3390/su9091585

Reusing Desulfurization Slag in Cement Clinker Production and the Influence on the Formation of Clinker Phases

1
Department of Environmental Engineering/Sustainable Environment Research Laboratories, National Cheng Kung University, No. 1, University Rd., Tainan City 70101, Taiwan
2
Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, No. 1, Sec. 3, Chunghsiao E. Rd., Taipei 10608, Taiwan
*
Author to whom correspondence should be addressed.
Received: 16 August 2017 / Revised: 5 September 2017 / Accepted: 5 September 2017 / Published: 6 September 2017
(This article belongs to the Section Sustainable Use of the Environment and Resources)
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Abstract

The purpose of this study was to investigate the reuse of desulfurization slag in cement clinker production and its influence on the formation of clinker phases. The desulfurization slag that mainly contained Ca and Si was identified as non-toxic, and thus it should be suitable to be reused in clinker production. The addition of desulfurization slag increased the melt phase during clinkerization, but the excess melt phase inhibited the formation of clinker phases. This could be attributed to the sulfur and fluoride derived from the De-S slag. At low desulfurization slag addition (5.4 wt %), the resulting clinker had a mineralogical composition similar to that of the reference clinker. The desulfurization slag added can lower the clinkerization temperature and increase the amount of Ca3SiO5 at 1300 °C, which may be beneficial to energy conservation in clinker burning. Moreover, reusing desulfurization slag additionally has the potential to reduce the energy needed for clinker grinding. View Full-Text
Keywords: desulfurization slag; cement; reuse and recycling; energy saving; waste management; X-ray diffraction desulfurization slag; cement; reuse and recycling; energy saving; waste management; X-ray diffraction
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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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Chen, Y.-L.; Chang, J.-E.; Ko, M.-S. Reusing Desulfurization Slag in Cement Clinker Production and the Influence on the Formation of Clinker Phases. Sustainability 2017, 9, 1585.

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