Phase Behaviors of Talc Minerals in Carbothermal Reduction Process

Abstract:

In this paper, we focus on the phase behaviors of talc minerals by carbothermal reduction (CR) method. The effects of temperature and carbon addition are both discussed in our work. In the experiment, acid-leaching talc was employed as raw material, carbon coke powders were adopted as reducing agent. The XRD results show that: When acid-leaching talc was used as raw material, quartz and few enstatite can be obtained at 1300 °C, with the temperature increasing, the diffraction intensities of enstatite increased. At 1550 °C, enstatite transformed to magnesium silicate and obvious β-SiC can be detected. At 1600 °C, the main phases in the final product are magnesium silicate and β-SiC. The SEM results reveal that the preferred, as-fabricated silicon carbide has morphology of irregular shape. Relatively pure β-SiC can be obtained by using acid-leaching talc mixed together with excess 50% of theoretical quantity of carbon powder sintered at 1550 °C for 4 h.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 123-126
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.123
• Online since: June 2012
• Authors: Wen Juan Li, Zhao Hui Huang, Zi He Pan, Yan Gai Liu, Ming Hao Fang
• Keywords: Acid-Leaching Talc, Carbothermal Reduction, Phase Transformation Behavior, Refractory

References

[1] D. Mainprice, Y.L. Page, J. Rodgers and P. Jouanna, Ab initio elastic properties of talc from 0 to 12 GPa: Interpretation of seismic velocities at mantle pressures and prediction of auxetic behaviour at low pressure. Earth Planet Sci. Lett. 274 (2008) 327-338.

DOI: 10.1016/j.epsl.2008.07.047

[2] J.A. Smith and N.J. Tappan, U.S. Patent 4,550,035. (1985)

[3] C.D. Mueller, S. Nazarenko, T. Ebeling, T.L. Schuman, A. Hiltner and E. Baer, Novel structures by microlayer coextrusion—talc-filled PP, PC/SAN, and HDPE/LLDPE. Polym. Eng. Sci. 37 (1997) 355-362.

DOI: 10.1002/pen.11678

[4] J.I. Velasco, J.A. De Saja and A.B. Martínez, Crystallization behavior of polypropylene filled with surface-modified talc. J. Appl. Polym. Sci. 61 (1996) 125-132.

DOI: 10.1002/(sici)1097-4628(19960705)61:1<125::aid-app14>3.0.co;2-6

[5] G. Sugerman and N.J. Allendale, U.S. Patent 5,045,579. (1991)

[6] N. Ernest, M.D. Arnett, E. William, M.D. Battle, V. John, M.D. Russo and C. William and M.D. Roberts, Intravenous injection of talc-containing drugs intended for oral use: A cause of pulmonary granulomatosis and pulmonary hypertension. Am. J. Med. 60 (1976) 711-718.

DOI: 10.1016/0002-9343(76)90508-8