Thermogravimetric Study of Porous Forsterite Synthesis by Hydromagnesite and Silica Gel Chlorination

OROSCO, R. P.; OJEDA, M. W.; GONZÁLEZ, J. A.; BARBOSA, L. I.

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Año: 2018

1876-990X

A novel pyrometallurgical process for the synthesis of porous forsterite by calcination in chlorine of a mixture containinghydromagnesite and silica gel was developed. The aim of this work was to produce porous forsterite at low temperaturesand short reaction times. Effects of temperature, reaction time and chlorine on the synthesis reaction were studied. Also,the reaction mechanism involved in the process was investigated. Isothermal and non-isothermal chlorination assays werecarried out in a thermogravimetric equipment designed to work in corrosive atmospheres. Reagents and products wereanalyzed by thermogravimetry (TG) and X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2 adsorption?desorption isotherm (BET). The results showed that forsterite was obtained at 700 ◦C with a mesoporous structure and aspecific surface area of 16.8 m2/g. Furthermore, it was observed that the presence of chlorine favored the decomposition ofhydromagnesite.