MICROWAVE DEHYDRATION MODELLING OF TINCALCONITE

Year 2018, Special Issue 7: International Conference on Energy and Thermal Engineering Istanbul 2017 (ICTE 2017), 1803 - 1812, 20.12.2017

Seyma Çoban Berker Özkarasu Fatma Tuğçe Şenberber , Azmi Seyhun Kıpçak , İbrahim Doymaz , Emek Moroydor Derun

https://doi.org/10.18186/journal-of-thermal-engineering.382399

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

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