Foamed Glass-Ceramics Made from Red-Mud

Abstract:

Dried Red mud slurry was ground to small powders. It was then mixed with waste glass and dolomite powders. The mixtures with different amounts of red mud and dolomite were pressed to form green bodies, which were foamed at high temperatures. To achieve a good foaming effect, the content of red mud is 35~45% in the batch and 10wt% of dolomite should be added as the foaming agent. It is found that the best foaming temperature is 1130°C, much higher than the decomposition temperature of the pure dolomite. The best obtained product has an apparent density, bending strength of 0.896g/cm³ and 9.7MPa, respectively. X-ray measurement results indicate that the red mud has reaction with the other raw materials used in the green body. The crystalline phase formed in the sample is augite. The present study provides a simple way to directly foam a mixture containing red mud to form useful glass-ceramics.

• Periodical: Key Engineering Materials (Volumes 575-576)
• Pages: 461-464
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.575-576.461
• Online since: September 2013
• Authors: Zhong Nan Ye, Yong Wei Wang, Hao Jiang, Na Li, Shi Quan Liu
• Keywords: Dolomite, Foamed Glass-Ceramic, Foaming, Red Mud

References

[1] Information on http: /www. gomelglass. com/en/catalogue/foam-glass.

[2] F. Yan, Study on the Preparation of Foam Glass and Mosaic Foam Glass from Boron Sludge (2008), Dalian University of Technology (in Chinese).

[3] Z.Y. Feng, X.X. Xue, Y. Li and H. Yang, Chin. J. Proc. Engin., Vol. 1. 8 No. 2 (2008), p.378 (in Chinese).

[4] X.S. Jiang, K.H. Zhu, L. Lu, and Y.L. Zhang : J. Ceram. , Vol. 33 No. 3（2012）(in Chinese), p.324.

[5] C. Schmitz: Red Mud Disposal (Handbook of Aluminium Recycling, Germany 2006).