Microwave Dehydration Behaviour of Inderite and Comparison with Thermal Analyses Methods

Dehydration is called as the water removal from hydrated structure. Dehydration behavior is important for the usage areas and transportation of minerals. Magnesium borates can be used as additive materials in areas such as in the production of superconducting materials, in the composition of detergents, due to the content of boron in the friction-reducing additives in oils and insulating coating compositions due to their good mechanic and thermal properties. In this study, dehydration behavior of Inderite (Mg(B3O3(OH)5).5H2O) was experimented by both using microwave energy different and thermal analyses techniques. In microwave dehydration, power level was selected as 600W. Mass loss and drying rates were determined. In thermal dehydration, hydrated mineral was applied to thermal analysis (TG-DTG). Structural changes of hydrated and dehydrated samples were characterized using the techniques of XRD and FT-IR. XRD results show that crystallinity of sample may decrease in microwave dehydration. According to FT-IR results, characteristic band values of water disappeared at the end of the dehydration.

Keywords:

microwave; dehydration; thermal analysis; inderite,

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O. Baysal, “New hydrous magnesium-borate minerals in turkey: kurnakovite, inderite, inderborite”, Bull. Min. Res. & Explor. Inst. Ankara, vol. 80, pp. 93–103, 1973.
U. Dosler, M. M. Krzmanc, D. J. Suvorov, microwave dielectric properties of Mg3B2O6 Eur Ceram Soc.,vol. 30, pp. 413– 418, 2010.
E. M. Elssfah, A. Elsanousi, J. Zhang,, H. S. Song, C. Tang, “Synthesis of magnesium borate nanorods”, Materials Letters, vol. 61, pp. 4358– 4361, 2007.
L. Zhihong, H. Mancheng, “Synthesis and thermochmistry of MgO.3B2O3.3,5H2O”, Thermochim Acta., vol. 403, pp.181–184, 2003.
E. Moroydor Derun, F. T. Senberber, A. S. Kipcak, N. Tugrul, and S. Piskin, “Microwave dehydration behavior of admontite mineral at 360W”, International Journal of Chemical, Nuclear, Materials and Metallurgical Engineering, vol. 7, 169–172, 2013.
E. Moroydor Derun and F. T. Senberber, “Characterization and thermal dehydration kinetics of highly crystalline mcallisterite, synthesized at low temperatures”, The Scientific World Journal, vol. 2014, 1–9, 2014.
S. Kocakusak, J. H. Koroglu, E. Ekinci and R. Tolun, “Production of anhydrous borax using microwave heating”, Industrial & Engineering Chemistry Research, vol. 34, pp. 881-885, 1955.
D. E. Clark, D. C. Folz and J. K. West, “Processing materials with microwave energy”, Materials Science and Engineering, vol. A287, pp. 153–158, 2000.
K. E. Haque, “Microwave energy for mineral treatment processes brief review”, International Journal of Mineral Processing, vol. 57, pp. 1-–24, 1999.
F. C. Iglesias, C. E. L. Hunt, R. M. Hutcheon, G. W. Wood and R. D. Barrand, “Microwaves and minerals: Tests of Ontario's industrial minerals”, Ontario Geological Survey, pp. 41–77, 1990.
Y. Saito, K. Kawahira, N. Yoshikawa, H. Todoroki and S. Taniguchi, “Dehydration behavior of goethite blended with graphite by microwave heating”, The Iron and Steel Institute of Japan International, vol. 51, pp. 878–883, 2011.
Y. Li, Y. Lei, L. Zhang, J. Peng and C. Li, “Microwave drying characteristics and kinetics of ilmenite”, Transactions of Nonferrous Metals Society of China, vol. 21, pp. 202−207, 2011.
J. Yongzhong, G. Shiyang, X. Shuping and L. Lun, “ FT-IR spectroscopy of supersaturated aqueous solutions of magnesium borate”, Spectrochim. Acta Part A, vol. 56, pp.1291−1297, 2000.