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

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

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Abstract

A method to synthesize high-purity ternesite at gram scale is presented and a brief description of the product morphology and reactivity is presented. Thermodynamic data for ternesite are derived from vapour pressure measurements and the limits of ternesite stability are 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 SO2 and O2 in the kiln atmosphere. Both thermodynamic predictions and lab experiments confirm that Calcium SulfoAluminate-Ternesite clinkers can be readily produced in a single stage process 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 kilograms of ternesite-containing clinkers. This demonstrates the usefulness of thermodynamic modelling as it has enabled ternesite based clinkers to be produced at scale in a single-stage process using existing equipment without major modifications.
Original languageEnglish
Pages (from-to)91-100
Number of pages9
JournalCement and Concrete Research
Volume98
Early online date28 Apr 2017
DOIs
Publication statusPublished - 1 Aug 2017

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Thermodynamics
Rotary kilns
Kilns
Pressure measurement
Vapor pressure
Temperature
Calcium
Experiments
calcium sulfoaluminate

Keywords

  • Cement Manufacture (E)
  • Sulfoaluminate (D)
  • Thermodynamic Calculations (B)
  • Ternesite

Cite this

Stability of ternesite and the production at scale of ternesite-based clinkers. / Hanein, Theodore; Galan, Isabel; Glasser, Fredrik; Skalamprinos, Solon; Elhoweris, Ammar; Imbabi, Mohammed S.; Bannerman, Marcus N.

In: Cement and Concrete Research, Vol. 98, 01.08.2017, p. 91-100.

Research output: Contribution to journalArticle

Hanein T, Galan I, Glasser F, Skalamprinos S, Elhoweris A, Imbabi MS et al. Stability of ternesite and the production at scale of ternesite-based clinkers. Cement and Concrete Research. 2017 Aug 1;98:91-100. https://doi.org/10.1016/j.cemconres.2017.04.010
Hanein, Theodore ; Galan, Isabel ; Glasser, Fredrik ; Skalamprinos, Solon ; Elhoweris, Ammar ; Imbabi, Mohammed S. ; Bannerman, Marcus N. / Stability of ternesite and the production at scale of ternesite-based clinkers. In: Cement and Concrete Research. 2017 ; Vol. 98. pp. 91-100.
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AU - Bannerman, Marcus N.

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N2 - A method to synthesize high-purity ternesite at gram scale is presented and a brief description of the product morphology and reactivity is presented. Thermodynamic data for ternesite are derived from vapour pressure measurements and the limits of ternesite stability are 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 SO2 and O2 in the kiln atmosphere. Both thermodynamic predictions and lab experiments confirm that Calcium SulfoAluminate-Ternesite clinkers can be readily produced in a single stage process 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 kilograms of ternesite-containing clinkers. This demonstrates the usefulness of thermodynamic modelling as it has enabled ternesite based clinkers to be produced at scale in a single-stage process using existing equipment without major modifications.

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