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

Jinfu Li, Changsheng Yue, Mei Zhang, Xidong Wang and Zuotai Zhang
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Jinfu Li: Department of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
Changsheng Yue: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Mei Zhang: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Xidong Wang: Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, China
Zuotai Zhang: Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, China

Energies, 2015, vol. 8, issue 7, 1-13

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 ?-SiAlON composite was successfully produced using coal gangue. The synthesized ?-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.

Keywords: coal gangue; carbothermal reduction nitridation; SiAlON-based composite; prototype plant (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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