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HomeKey Engineering MaterialsKey Engineering Materials Vol. 690Utilization of Expanded Perlite as a Source of...

Utilization of Expanded Perlite as a Source of Silica for Synthesizing Wollastonite by Solid State Reaction

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Abstract:

Naturally occurring volcanic glass in the form of the expanded perlite consist of 72.59wt% silica was used as a starting material together with the calcined eggshell in order to explore the wollastonite formation via solid state reaction. The molar mixing ratios of CaO:SiO₂ were carried out from 1:0.8 to 1:1.4, calcined in the range of 600 - 1100°C for 2 - 5 hours. The XRD results confirm the formation of wollastonite (CaSiO₃) started at 800°C, and increasing of calcination temperature favoured the formation of gelehnite (Ca₂Al₂SiO₇) associated with wollastonite. The morphology characterized by SEM clearly show tiny needle-like shape of primary wollastonite on the surface of agglomerate particles. The CaO:SiO₂ ratio of 1:1.4 which calcined at 1100 °C for 2-5 hours was found to be the most appropriate molar ratio in the case of using the calcined eggshell and expanded perlite as starting materials.

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Traditional and Advanced Ceramics II

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Periodical:

Key Engineering Materials (Volume 690)

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143-149

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.690.143

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Online since:

May 2016

Authors:

Napat Chantaramee*, Pornpimol Kaewpoomee, Ratchadaporn Puntharod

Keywords:

Eggshell, Perlite, Solid State Reaction, Wollastonite

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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