Influences of Heat Treatment Soaking Time on Crystallization and Properties of Tailings-based Glass-Ceramics

doi:10.11901/1005.3093.2019.426

Chinese Journal of Materials Research

2020, Vol. 34

Issue (3): 209-216 DOI: 10.11901/1005.3093.2019.426

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Influences of Heat Treatment Soaking Time on Crystallization and Properties of Tailings-based Glass-Ceramics

LI Hongxia(

),LI Baowei,XU Pengfei,LIU Zhongxing

Materials and Metallurgy School，Inner Mongolia University of Science and Technology，Baotou 014010，China

Cite this article:

LI Hongxia,LI Baowei,XU Pengfei,LIU Zhongxing. Influences of Heat Treatment Soaking Time on Crystallization and Properties of Tailings-based Glass-Ceramics. Chinese Journal of Materials Research, 2020, 34(3): 209-216.

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Abstract

Diopside tailings-based glass-ceramics were prepared via melting method plus one-step crystallization heat treatment with Shandong gold tailings and Guyang iron tailings as the main raw material. Then the influence of heat treatment soaking time on the crystal growth and properties of the prepared glass-ceramics was investigated by DSC, XRD, Raman spectroscopy, SEM, and universal mechanical properties tester. The results show that diopside crystals can grow through nucleation and whereafter growth when heat treated at 720℃ for 30 min. With the increase of heat treatment time, the size of diopside crystals gradually increased and the morphology of the crystals evolved from spherical to dendritic. When the heat treatment temperature was 820℃, the morphology and structure of the diopside crystals did not change with the increase of soaking time. Thus, heat treatment at 820℃ for 2 h can be considered to be the optimal. The prepared glass ceramics exhibit an excellent comprehensive performance with density of 2.97 g/cm³, bending strength of 211.0 MPa, hardness of 789.0 MPa, acid resistance of 99.4% and alkali resistance of 99.3 % respectively.

Key words: inorganic non-metallic materials tailing-based glass-ceramic soaking time diopside crystal growth

Received: 31 August 2019

ZTFLH:

TQ174

Fund: National Natural Science Foundation of China(51964039);Natural Science Foundation of Inner Mongolia Autonomous Region(2019MS05050);Inner Mongolia Autonomous Region University Scientific Research Project(NJZZ18141)

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	Hongxia LI
	Baowei LI
	Pengfei XU
	Zhongxing LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.426 OR https://www.cjmr.org/EN/Y2020/V34/I3/209

Table 1 Chemical compositions of gold tailings and iron tailings (mass fraction， %)

Fig.1 XRD patterns of raw materials (a) iron tailing, (b) gold tailing

Table 2 Nominal compositions of base glass (mass fraction, %)

Fig.2 DSC curve of basic glass

Table 3 Heat treatment parameters of the glass-ceramic samples

Fig.3 SEM images of as-synthesized glass-ceramics at 720℃ with different soaking time by conventional heating (a) C20D-720℃/20 min, (b) C30D-720℃/30 min, (c) C60HD-720℃/1 h, (d) C120HD-720℃/2 h

Fig.4 SEM images of as-synthesized glass-ceramics at 820℃ with different soaking time by conventional heating (a) C0G-820℃/0 min, (b) C15G-820℃/15 min, (c) C30G-820℃/30 min, (d) C45G-820℃/45 min

Fig.5 XRD patterns of glass-ceramics heat treated at 720℃ for different soaking times

Fig.6 XRD patterns of glass-ceramics heat treated at 820℃ for different soaking times

Fig.7 TEM images of the sample heat treated at 720℃ for 1 h (C60HD) (a) BF image, (b) SAED image of diopside, (c) HRTEM image, (d) HADDF image

Fig.8 Raman spectra of glass-ceramics heat treated at 720℃ for different soaking times

Fig.9 Raman spectra of as-synthesized glass-ceramics heat treated at 820℃ for different soaking times

Table 4 Raman bands observed for the tailing-based glass-ceramic materials

Table 5 Physical and chemical properties of glass-ceramics heat treated for various soaking time

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