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Fluxing reactions of sulphate and carbonates in cement clinkering. I. Systems CaSO4-K2SO4 and K2SO4-CaCO3

✍ Scribed by Hugo Bolio Arceo; F.P. Glasser

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
353 KB
Volume
20
Category
Article
ISSN
0008-8846

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✦ Synopsis

Phase equilibrEa and thermodynamics have been used to determine compatabilities in the systems CaSO4-K2SO4 and K2SO4-CaCO3.

In the CaSOΒ’-K2SO4 system, a polymorphic inversion at 200"C is encountered in K2Ca2(SO4)3.

Thermodynamic calculation of the reciprocal salt system K2SO4-CaCO3-CaSO4-KzC03 discloses that the join K2SO4-CaCO3 constitutes a stable binary: experiments in flowing CO2 at ! bar pressure confirm this.

A noteworthy feature of the system is the solid solution of CaCO3 in K2SO4, reaching ~20% mol % CaCO3. The eutectic, located at 880"C and 43 mo] % CaCO3, is attainable without significant decomposition.

The possible consequences to clinkering reactions are discussed.

πŸ“œ SIMILAR VOLUMES

The role of sulphates in cement clinkeri
The role of sulphates in cement clinkering reactions: phase formation in the system CaOξ—ΈAβ„“2O3ξ—ΈFe2O3ξ—ΈSiO2ξ—ΈCaSO4ξ—ΈK2SO4
✍ Y.B. Pliego-Cuervo; F.P. Glasser πŸ“‚ Article πŸ“… 1979 πŸ› Elsevier Science 🌐 English βš– 521 KB

The CaO-rich portions of the systems CaO-A~203-SiO2-K2SO,, CaO-AC203-K2SO,-CaSO,, CaO-A~203-SiO2-K2SO,-CaSO, and CaO-A~203-Fe203-CaSO,-K2SO, have been studied experimentally. Schemes are presented showing phase assemblages compatible at subsolidus temperatures. Melting commences at about 825Β°C in as