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Formation of scawtite from mixtures of CaO, magnesite and quartz under hydrothermal conditions

✍ Scribed by L. Števula; J. Petrovič


Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
499 KB
Volume
11
Category
Article
ISSN
0008-8846

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✦ Synopsis


The phase composition of samples prepared under hydrothermal conditions at 200°C from a suspension of mixtures of CaO, quartz and magnesite has been studied. When I0, 20, 30 and 50 wt % of CaO were substituted by magnesite, the mole ratio CaO/SiO 2 being 0,83 and 1,20 -chiefly tober~w)rite, gyrolite and calcite or scawtite and tobermorite were formed, and the strength of the tested materials was observed to decrease.

Die Phasenzusammensetzung der aus der Wassersuspension der Gemengen CaO, Quarz und Magnesit unter hydrothermalen Bedingungen bei 200°C hergestellten Proben wurden untersucht. Es wurde festgestellt, dass durch den Ersatz yon I0, 20, 30 und 50 Gewichtsprozent CaO mit Magnesit bei einem Molverh~Itnis CaO/SiO 2 = 0,83 resp. 1,20 -hauptsEchlich Tobermorit, Gyrolit und Kalzit resp. Scawtit und Tobermorit entstehen, wobei das gepr~fte Material an Festigkeit verliert.


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