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Energies 2015, 8(7), 7428-7440; doi:10.3390/en8077428

Facile and Economical Preparation of SiAlON-Based Composites Using Coal Gangue: From Fundamental to Industrial Application

1
Department of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
3
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: 21 May 2015 / Revised: 11 July 2015 / Accepted: 13 July 2015 / Published: 22 July 2015
(This article belongs to the Special Issue Recent Advances in Coal Combustion and Gasification)
View Full-Text   |   Download PDF [2790 KB, uploaded 22 July 2015]   |  

Abstract

The present study aims to synthesize SiAlON-based composites utilizing coal gangue. Different types of SiAlON-based composites were synthesized using coal gangue by carbothermal reduction nitridation method through control of different reaction atmospheres. The experimental results indicate that the oxygen partial pressure was an essential factor in the manufacture of SiAlON-based composites and under proper control of the atmospheres, SiAlON-based composites with different crystal structures could be synthesized. The optimum conditions of synthesis of different SiAlON-based composites were respectively determined. Based on the laboratory results, a prototype plant was proposed and constructed, and β-SiAlON composite was successfully produced using coal gangue. The synthesized β-SiAlON composite was applied in preparation of iron ladle brick instead of SiC, which showed that the compression strength, refractoriness under load and high temperature bending strength were increased from 44.5 ± 6.7 MPa, 1618 ± 21 °C and 5.4 ± 1.2 MPa to 64.1 ± 2.5 MPa, 1700 ± 28 °C and 7.1 ± 1.6 MPa, respectively. Compared with the traditional synthesis method, the present technique is expected to save energy both in raw materials and technical process. View Full-Text
Keywords: coal gangue; carbothermal reduction nitridation; SiAlON-based composite; prototype plant coal gangue; carbothermal reduction nitridation; SiAlON-based composite; prototype plant
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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MDPI and ACS Style

Li, J.; Yue, C.; Zhang, M.; Wang, X.; Zhang, Z. Facile and Economical Preparation of SiAlON-Based Composites Using Coal Gangue: From Fundamental to Industrial Application. Energies 2015, 8, 7428-7440.

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