Stability of ternesite and the production at scale of ternesite-based clinkers

Theodore Hanein, Isabel Galan, Fredrik P. Glasser, Solon Skalamprinos, Ammar Elhoweris, Mohammed S. Imbabi, Marcus N. Bannerman

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Abstract

A method to synthesize high-purity ternesite is presented and the importance of reaction volume is highlighted; a
brief description of the product morphology is also presented. Thermodynamic data for ternesite are derived and
the limits of ternesite stability are then explored. An upper temperature stability limit of ≈1290 °C at 1 atm is
determined; however, this temperature is dependent on the fugacity of the volatile components in the
atmosphere. Thermodynamic predictions confirm that belite and ternesite rich calcium sulfoaluminate clinkers
can be readily produced in a single stage process at temperatures above 1200 °C provided the atmosphere and
temperature are controlled. To demonstrate this control at larger scales, a conventional 7.4-meter rotary kiln has
been used to produce ≈20 kg of ternesite-containing clinkers. This demonstrates the usefulness of thermodynamic
modelling as it has enabled ternesite-based clinkers to be readily produced at scale in a single-stage
process using existing equipment without major modifications.
Original languageEnglish
JournalCement and Concrete Research
Volume98
Publication statusPublished - 2017
Externally publishedYes

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Hanein, T., Galan, I., Glasser, F. P., Skalamprinos, S., Elhoweris, A., Imbabi, M. S., & Bannerman, M. N. (2017). Stability of ternesite and the production at scale of ternesite-based clinkers. Cement and Concrete Research, 98.