Utilization of Expanded Perlite as a Source of Silica for Synthesizing Wollastonite by Solid State Reaction
| Autor: | Ratchadaporn Puntharod, Pornpimol Kaewpoomee, Napat Chantaramee |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Morphology (linguistics) Materials science Mechanical Engineering Mixing (process engineering) 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Wollastonite law.invention Volcanic glass Chemical engineering Mechanics of Materials Agglomerate law 0103 physical sciences Perlite engineering General Materials Science Calcination Composite material Eggshell 0210 nano-technology |
| Zdroj: | Key Engineering Materials. 690:143-149 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.690.143 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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