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Chinese Journal of Materials Research  2015, Vol. 29 Issue (11): 874-880    DOI: 10.11901/1005.3093.2014.681
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Influence of Nd2O3 Addition on Performance of Glass-ceramics Synthesized with Tailings of Bayan-Obo West Mine
Baowei LI1,Xiaoyu HE1,2,Hua CHEN1,3,**(),Ming ZHAO1,Kaiyu SUN1,2
1. Key laboratory of Integrated Exploitation of Bayan Obo Multi Metal resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
2. School of Material and Metallurgy, Inner Mongolia University of Science and Technology,Baotou 014010, China
3. School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
Cite this article: 

Baowei LI,Xiaoyu HE,Hua CHEN,Ming ZHAO,Kaiyu SUN. Influence of Nd2O3 Addition on Performance of Glass-ceramics Synthesized with Tailings of Bayan-Obo West Mine. Chinese Journal of Materials Research, 2015, 29(11): 874-880.

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Abstract  

Glass ceramics of CaO-Al2O-MgO-SiO2 (CAMS) with addition of 0-8.73%(mass fraction) Nd2O3 were synthesized mainly with the tailings of Bayan-Obo west mine by melting-casting method. The influence of the amount of Nd2O3 on the microstructure and properties of the glass ceramics was systematically investigated by DTA, XRD, FEGSEM equipped with EDS EBSD attachments and universal mechanical properties tester. The results show that the average grain size of the primary crystalline phase, augite (Ca(Mg, Al, Fe)Si2O6), decreases with the increase amount of Nd2O3 addition, and the main reason can be ascribed to the hindering effects of Ca2Nd8(SiO4)6O2 particles and the consumption of Ca2+ ions by the formation this newly formed Nd-rich phase on the grain growth of augite crystals during the heattreatment process. The glass ceramics with 2.21% Nd2O3 shows the optimal properties, i.e. of which the density, bending strength and the resistance to acid or alkali corrosion are 3.20 g/cm3, 200 MPa, 95.22%and 99.23%, respectively.

Key words:  inorganic non-metallic materials      glass ceramics      Bayan Obo west mine tailing      Nd2O3     
Received:  18 November 2014     
Fund: *Supported by Major Project of Chinese National Programs for Fundamental Research and Development No.2012CB722802 and the Major Project of Inner Mongolia Science and Technology No. 414060901.
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Baowei LI
Xiaoyu HE
Hua CHEN
Ming ZHAO
Kaiyu SUN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.681     OR     https://www.cjmr.org/EN/Y2015/V29/I11/874

No. SiO2 CaO Al2O3 MgO B2O3 Na2O K2O CaF2 Cr2O3 Nd2O3
C1 50 20 5.94 7.73 2.00 0.55 1.56 6.00 0.25 0
C2 50 20 5.94 7.73 2.00 0.55 1.56 6.00 0.25 1.13
C3 50 20 5.94 7.73 2.00 0.55 1.56 6.00 0.25 2.21
C4 50 20 5.94 7.73 2.00 0.55 1.56 6.00 0.25 4.39
C5 50 20 5.94 7.73 2.00 0.55 1.56 6.00 0.25 6.6
C6 50 20 5.94 7.73 2.00 0.55 1.56 6.00 0.25 8.73
Table 1  Normal compositions of base glass with (0-8.73)% Nd2O3 (%, mass fraction)
Fig.1  DTA curves of the water cast base glass sampleswith (0-8.73% ) Nd2O3
Fig.2  XRD patterns of the glass-ceramicssamples with (0-8.73% )Nd2O3
Fig.3  BSE-SEM images of the glass-ceramics with (0-8.73)%Nd2O3
Fig.4  EDS mapping results (a) secondary phase location, (b) EDS data corresponding to secondary phase
Fig.5  EBSD mapping results (a) EBSD pattern, (b) Kikuchi bands
Fig.6  Inverse pole figures of the primary phase in specimen C6 on the directions of x, y and z axes
No. Density / gcm-3 Bending strength / MPa Acid-resistance (20%H2SO4) Alkali-resistance (20%NaOH)
C1 3.16 197 93.66% 99.19%
C2 3.18 204 94.62% 99.13%
C3 3.20 200 95.22% 99.33%
C4 3.23 213 92.91% 99.30%
C5 3.28 214 92.40% 99.21%
C6 3.32 223 93.07% 99.26%
Table 2  Properties of glass-ceramics with 0-8.73%Nd2O3.
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