MICROWAVE DEHYDRATION MODELLING OF TINCALCONITE

Abstract

Boron is known element due to wide range of application areas. Microwave dehydration has more advantages than conventional dehydraion. Differ dehydraion mechanism, higher dehydraion rate and higher level of safety are some of this advantages. Furthermore, most of minerals give better result in microwave for temperature increase. Particle size, microwave power and sample mass are parameters which effect to dehydration directly. Structure of tincalconite is suitable for the investigation of dehydration behavior by microwave because of their five moles of crystal water. Tincalconite is a type of sodium borate mineral which has a white color, trigonal system and molecule formula of Na2B4O7•5H2O. Tincalconite contains 48.8% of boron oxide(B2O3) and 29.47% of structural water. In this study, dehydration behavior of tincalconite was studied with using microwave irradiation with the power level of 180 and 360 W. The kinetic parameters of reaction were determined by using the dehydration kinetic models of Lewis, Henderson and Pabis and Wang and Singh. Tincalconite and dehydrated tincalconite characterized by the techniques of X-ray diffraction (XRD) and Raman spectroscopy. According to the results obtained tincalconite was dehydrated successfully at the microwave power level of 360 W at 14 min, on the contrary at 180 W, only the 68% of the structural water was dehydrated. Among the models, which are applied only at 360 W, Wang and Singh model best fits the data with the coefficient of regression (R2) value of 0.9965.

Keywords

• Tincalconite,Microwave,Dehydration,Modelling,XRD,Raman

References

1. [1] http://www.etimaden.gov.tr (Accessed December 6, 2016)
2. [2] http://www.boren.gov.tr (Accessed December 10, 2016)
3. [3] http://www.mindat.org (Accessed December 21, 2016)
4. [4] http://www.webmineral.org (Accessed December 21, 2016)
5. [5] Derun, E. M., Senberber, F. T., Kipcak, A. S., Tugrul, N., & Piskin, S. (2013). Microwave dehydration behavior of admontite mineral at 360W. International Journal of Chemical, Nuclear, Materials and Metallurgical Engineering, 7, 169-172.
6. [6] Li, Y., Lei, Y., Zhang, L. B., Peng, J. H., & Li, C. L. (2011). Microwave drying characteristics and kinetics of ilmenite. Transactions of Nonferrous Metals Society of China (English Edition), 21(1), 202–207.
7. [7] Verstor, W. The effect of microwave radiation on mineral processing, PhD Thesis, University of Birmingham, 2011.
8. [8] Tahmasebi, A., Yu, J., Li, X., & Meesri, C. (2011). Experimental study on microwave drying of Chinese and Indonesian low-rank coals. Fuel Processing Technology, 92(10), 1821–1829.

9. [9] Saito, Y., Kawahira, K., Yoshikawa, N., Todoroki, H., & Taniguchi, S. (2011). Dehydration Behavior of Goethite Blended with Graphite by Microwave Heating. ISIJ International, 51(6), 878–883.
10. [10] Özdoğan, İ., Aksoy, Y., Senberber, T., Kipcak, S., Piskin, M., & Derun, E. M. (2015). Microwave Dehydration Behaviour of Inderite and Comparison with Thermal Analyses Methods. Celal Bayar University Journal of Science, 11(3).
11. [11] Pickles, C. A. (2004). Microwave heating behaviour of nickeliferous limonitic laterite ores. Minerals Engineering, 17(6), 775–784.
12. [12] Eskibalci, M. F., & Ozkan, S. G. (2012). An investigation of effect of microwave energy on electrostatic separation of colemanite and ulexite. Minerals Engineering, 31, 90–97.
13. [13] Nhlabathi, T. N., Nel, J. T., Puts, G. J., & Crouse, P. L. (2012). Microwave digestion of zircon with ammonium acid fluoride: Derivation of kinetic parameters from non-isothermal reaction data. International Journal of Mineral Processing, 114–117, 35–39.
14. [14] Alvarez-Silva, M., Vinnett, L., Langlois, R., & Waters, K. E. (2016). A comparison of the predictability of batch flotation kinetic models. Minerals Engineering, 99, 142–150.
15. [15] Erdoğan, Y., Zeybek, A., Şahin, A., & Demirbaş, A. (1999). Dehydration kinetics of howlite, ulexite, and tunellite using thermogravimetric data. Thermochimica acta, 326(1), 99-103.
16. [16] Roussy, G., Zoulalian, A., Charreyre, M., & Thiebaut, J. M. (1984). How microwaves dehydrate zeolites. The Journal of Physical Chemistry, 88(23), 5702-5708.
17. [17] Eymir, Ç., & Okur, H. (2005). Dehydration of ulexite by microwave heating. Thermochimica acta, 428(1), 125-129.
18. [18] Kocakuşak, S., Köroǧlu, H. J., & Tolun, R. (1998). Drying of wet boric acid by microwave heating. Chemical Engineering and Processing: Process Intensification, 37(2), 197-201.
19. [19] Hammouda, I., & Mihoubi, D. (2014). Comparative numerical study of kaolin clay with three drying methods: Convective, convective–microwave and convective infrared modes. Energy Conversion and Management, 87, 832-839.
20. [20] Wang, C. Y., & Singh, R. P. (1978). A single layer drying equation for rough rice (No. 78-3001, p. 33). ASAE paper.
21. [21] Kipcak, A. S. (2017). Microwave drying kinetics of mussels (Mytilus edulis). Research on Chemical Intermediates, 43(3), 1429-1445.
22. [22] Doymaz, I., Kipcak, A. S., & Piskin, S. (2015). Microwave Drying of Green Bean Slices: Drying Kinetics and Physical Quality. Czech Journal of Food Science, 33(4).