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Phase Transformations from Quartz to Cristobalite

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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Category

Academic chapter

Language

English

Author(s)

Affiliation

  • SINTEF Industry / Metal Production and Processing
  • Norwegian University of Science and Technology

Year

2018

Publisher

Springer Nature

Book

Extraction 2018- Proceedings of the First Global Conference on Extractive Metallurgy

ISBN

9783319950211

Page(s)

717 - 727

View this publication at Norwegian Research Information Repository