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

Hanein, Theodore; Galán, Isabel Moratilla; Glasser, F. P.; Skalamprinos, Solon; Elhoweris, Ammar; Imbabi, M.S.; Bannerman, Marcus N.

doi:10.1016/j.cemconres.2017.04.010

Cited by 54 publications

(51 citation statements)

References 24 publications

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“…The purity of the sample was 91.1 mass% ternesite, 5.3 mass% beta belite, 3.2 mass% gamma belite and 0.5 mass% calcium sulphate. It is possible to reach higher ternesite purity, as reported by Hanein et al [15], but the process is slower and requires a different setup limiting synthesis to smaller quantities, maximum 20 g/batch. The purity obtained for the present study was considered sufficient for measurements; calculations are described subsequently.…”

Section: Ternesitementioning

confidence: 79%

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Enthalpy of formation of ye’elimite and ternesite

Skalamprinos

Galán

Hanein

et al. 2017

J Therm Anal Calorim

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Calcium sulfoaluminate clinkers containing ye'elimite (Ca 4 Al 6 O 12 (SO 4 )) and ternesite (Ca 5 (SiO 4 ) 2 SO 4 ) are being widely investigated as components of calcium sulfoaluminate cement clinkers. These may become low energy replacements for Portland cement. Conditional thermodynamic data for ye'elimite and ternesite (enthalpy of formation) have been determined experimentally using a combination of techniques: isothermal conduction calorimetry, X-ray powder diffraction and thermogravimetric analysis. The enthalpies of formation of ye'elimite and ternesite at 25°C were determined to be -8523 and -5993 kJ mol -1 , respectively.

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Section: Ternesitementioning

confidence: 79%

“…CaSO 4 , giving -5696 kJ mol -1 : enthalpy values were taken from [12]. Recent, high-temperature thermodynamic data were theoretically derived from vapour pressure measurements [27] by Hanein et al [15]; the enthalpy of ternesite formation was calculated to be -5673 kJ mol -1 at 1448 K (1175°C).…”

Section: Ternesitementioning

confidence: 99%

Enthalpy of formation of ye’elimite and ternesite

Skalamprinos

Galán

Hanein

et al. 2017

J Therm Anal Calorim

Self Cite

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“…[17,18].Similar findings (≈1290 ºC at 1 atm.) were reported by Hanein et al [19], who determined the thermodynamic constants of ternesite to lie between 1000 ºC and 1400ºC, based on previously published vapour pressure measurements of several sulphates obtained between those temperatures [22]. Those studies showed that the vapour pressure of ternesite, like that of anhydrite, rises with temperature, while ternesite exhibits a pressure lower than anhydrite at 1000 to 1290 ºC and higher above that range.…”

Section: Cmss-2017mentioning

confidence: 88%

“…For a given temperature and partial pressure of O 2 (which must always be higher than in SO 2 for SO 3 to form), there is a maximum SO 2 pressure above which ternesite does not form [19].…”

Section: Cmss-2017mentioning

confidence: 99%

“…According to the literature, ye'elemite, ternesite and anhydrite clinkers at a ratio (by weight) of 1:1:0.5 can be obtained from traditional raw materials or industrial byproducts at temperatures of around 1200 ºC [14].Twostage clinkerización has also been successfully applied to produce such cements, clinkering the raw meal at 1250 ºC for 1 h, followed by gradual cooling to 1100 ºC and quick cooling below that temperature [10,20,21].Singlestage belite and ternesite-rich calcium sulphoaluminate (BY(F)T) have been obtained at a maximum temperature of 1260 ºC in a pilot plant where the partial pressure of O 2 and SO 2 was controlled in the kiln [19].…”

Section: Cmss-2017mentioning

confidence: 99%

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Ternesite as a component of sulfobelitic cements

Blanco-Varela

Carmona-Quiroga

2018

MATEC Web Conf.

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Abstract. The cement industry is presently devoting substantial effort to the development of less energy intensive, lower emission cements. Calcium sulfoaluminate (CSA) cements, one of the most promising alternatives, are known as 'eco-cements' in light of their lower energy costs and GHG emissions. Whilst their clinker composition may vary, all these cements lie in the CaO-A l2 O 3 -SiO 2 -Fe 2 O 3 -CaSO 4 system, with constituent minerals that include C 2 A, C 2 S, C 12 A 7 , CA, CŜ, and C 4 AF. Ternesite (C 5 S 2 Ŝ), a phase compatible with ye'elemite (C 4 A 3 Ŝ) and C 2 S, can also be found in that system.Recent studies show that it is activated and hydrated in the presence of AH 3 and gypsum, yielding ettringite and C-S-H gel, the main hydration products of CSA and OPC, respectively, as well as C 2 ASH 8 .This study analyses ternesite reactivity in different aluminate blends.

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Characterisation of asbestos-containing wastes by thermal analysis

Kusiorowski,

Gerle,

Kujawa

et al. 2024

J Therm Anal Calorim

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The study examined building materials containing asbestos, which have been considered hazardous waste for several years. Samples were taken from various places in Poland. The chemical composition was examined using chemical analysis, the mineralogical phases were identified using X-ray diffraction, and the structure was identified using scanning electron microscopy, taking into account energy-dispersive spectroscopy. Thermal tests of the samples were performed using thermal analysis, thermogravimetric measurements and high-temperature microscopy. Additionally, changes that occurred in the microstructure were determined using mercury porosimetry and infrared spectroscopy. All the above research methods were used to characterise the properties of cement–asbestos materials, which were also subjected to isothermal thermal treatment at a temperature of 1100 °C for 4 h. The results proved that the material after thermal treatment undergoes significant structural changes. The thermal decomposition process of cement–asbestos involves dehydration, dehydroxylation and then recrystallisation to new stable crystalline phases but in the context of asbestos, we are dealing here with the so-called phenomenon of pseudomorphosis. Knowledge about the thermal properties of asbestos materials can provide us with data on how the material undergoes significant structural changes, thanks to which it will be possible to use neutralised cement–asbestos waste as possible safe materials.

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

Cited by 54 publications

References 24 publications

Enthalpy of formation of ye’elimite and ternesite

Enthalpy of formation of ye’elimite and ternesite

Ternesite as a component of sulfobelitic cements

Characterisation of asbestos-containing wastes by thermal analysis

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