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
Formation of scawtite from mixtures of CaO, dolomite and quartz under hydrothermal conditions
✍ Scribed by L. Števula; J. Petrovič
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 260 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0008-8846
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✦ Synopsis
Water suspension of mixtures of CaO, and quartz (CaO/SiO o = 1,2; 1,6 and 2,0) in which I0-50 wt % CaO were substituted by dolomite, were hydrothermally treated at 20O°C. X-ray phase analysis of reaction products showed that chiefly scawtite and partly calcium-and magnesium silicate hydrates were formed. The scanning electron micrographs showed variations in morphology of scawtite particles in dependence on the molar ratio of CaO/SiO 2.
Mit der R~ntgenphasenanalyse wurde festgestellt, dass durch den Ersatz von I0-50 Gewichtsprozent CaO mit Dolomit in einer Quarzmischung bei dem Molverh~Itnis von CaO/SiO 2 = 1,2; 1,6 and 2,0 in einer Wassersuspension unter hydrothermalen Bedingungen bei 200°C ~berwiegend Scawtit und teilweise Calcium-bzw. Magnesiumsilikathydrate entstehen. Von den Aufnahmen mit dem Rasterelektronenmikroskop ist ersichtlich, dass sich die Morphologie des Scawtits dem Molverh~Itnis CaO/SiO 2 entsprechend ~ndert.
📜 SIMILAR VOLUMES
Hydrothermal studies showed the location of scawtite in the narrow internal tetrahedron foshagite-xonotlite-CO2-H20 of the system CaO-SiO2-C02-H20 and its compatibility with the calcium silicate hydrates in the 4-phase assemblages. The phase assemblages in this region involve scawtite, foshagite, xo