Abstract
Two quartz types used in the silicon and ferrosilicon industry were heated to temperatures of 1600 and 1700 °C. The parameters varied were the temperature and the holding time at maximum temperature . The amount of quartz , cristobalite and intermediate amorphous phase were measured using XRD and the internal standard method. Type P showed a much larger ability to transform to cristobalite at lower temperatures than type A. Type P had a larger amount of alkali and alkaline earth impurities. This could have enhanced the transformation to cristobalite . For quartz type A the amount of cristobalite was larger at 1600 °C than 1700 °C. This can also be seen for some of the samples of type P at shorter holding times.
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Acknowledgements
This paper is published by permission of Elkem AS. The Research Council of Norway and Elkem Technology are appreciated for their financial support through the project High Temp Quartz—Methods for characterization of quartz properties predicting performance in high-temperature applications with project number 252212.
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Jusnes, K.F., Tangstad, M., Ringdalen, E. (2018). Phase Transformations from Quartz to Cristobalite. In: Davis, B., et al. Extraction 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-95022-8_56
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DOI: https://doi.org/10.1007/978-3-319-95022-8_56
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