Effect of Bayan-Obo Tailings Content on Crystallization Characteristics and Properties of Glass-ceramics

doi:10.11901/1005.3093.2019.472

Chinese Journal of Materials Research

2020, Vol. 34

Issue (5): 368-378 DOI: 10.11901/1005.3093.2019.472

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Effect of Bayan-Obo Tailings Content on Crystallization Characteristics and Properties of Glass-ceramics

SONG Xue, LI Yafan, REN Jie, ZHONG Yaoyu, ZHANG Hongxia(

), OUYANG Shunli

School of Science, Inner Mongolia University of Science & Technology, Baotou 014010，China

Cite this article:

SONG Xue, LI Yafan, REN Jie, ZHONG Yaoyu, ZHANG Hongxia, OUYANG Shunli. Effect of Bayan-Obo Tailings Content on Crystallization Characteristics and Properties of Glass-ceramics. Chinese Journal of Materials Research, 2020, 34(5): 368-378.

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Abstract

Metallic tailings built glass-ceramics were prepared with Bayan-Obo tailings as the main raw material and Cr₂O₃ as nucleating agent. The crystallization characteristics of tailings built glass-ceramics were characterized by means of DSC, XRD, SEM and Raman spectra and the properties of glass-ceramics were evaluated by bending strength, Vickers hardness and acid resistance tests. Results show that the glass-ceramics are mainly composed of crystalline phases of diopside and gehlenite, while the nucleating agent of Cr₂O₃ can promote the precipitation of the main crystalline phase of diopside by forming spinel. The mechanical and corrosion resistance characteristics of glass-ceramics showed a decreasing trend with the increase of tailings content. The higher CaO content caused by the increase of tailings content can lead to the obstruction of sliding and migration of crystalline phases in the crystal growth process. As a result, it was easy to produce cavities and defects in glass-ceramics. Meanwhile, the increase of the ratio of gehlenite/diopside was not conducive to the improvement of the properties of the glass-ceramics. In addition, the rare earth elements intergrowth in Bayan-Obo tailings can form the second phase of cerium calcium silica at the grain boundary, which can reduce the area and the total energy of grain boundaries, which was helpful to improve the mechanical and corrosion resistance of glass-ceramics.

Key words: inorganic non-metallic materials Bayan-Obo tailings glass-ceramics crystallization characteristics Cr₂O₃ rare earth

Received: 11 October 2019

ZTFLH:

TQ171

Fund: Innovation and Entrepreneurship Training Program for College Students of Inner Mongolia Autonomous Region(201910127011);Project of Education Department of Inner Mongolia Autonomous Region(NJZY18143);Natural Science Foundation of Inner Mongolia Autonomous Region(2017MS0507);Inner Mongolia Major Basic Research Open Project(0406091701)

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	Xue SONG
	Yafan LI
	Jie REN
	Yaoyu ZHONG
	Hongxia ZHANG
	Shunli OUYANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.472 OR https://www.cjmr.org/EN/Y2020/V34/I5/368

Table 1 Chemical composition of Bayan Obo mine tailing (mass fraction, %)

Table 2 Mass fraction of raw material of the tailing glass-ceramics (mass fraction, %)

Table 3 Main chemical composition of the tailing glass-ceramics (mass fraction, %)

Fig.1 DSC curves of the as-cast glasses with different ratio of tailing

Table 4 Thermal properties of CMAS glasses

Fig.2 XRD spectra of glass-ceramics with different tailing additions

Fig.3 SEM images of the glass-ceramics with different tailing additions (a) BFS75, (b) BFS80, (c) BFS85

Fig.4 EDS images and the element-distribution mapping of sample BFS75

Fig. 5 EDS point scan analysis of sample BFS75, (a) spinel, (b) diopside, (c) gehlenite

Fig.6 EDS images and the element-distribution mapping of sample BFS80

Fig.7 EDS images and the element-distribution mapping of sample BFS85

Fig.8 Raman spectra of glass-ceramics with different tailing additions

Table 5 Properties of glass-ceramics with different tailing additions

Fig.9 EDS images and the element-distribution mapping of sample BFS75 etched by HF

Fig.10 TEM micrograph of powder sample GC3 (a) TEM micrograph, (b) element-distribution mapping of Ce, (c) point scanning analysis

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