Ceramics-Silikáty 19, (2) 105 - 115 (1975) |
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SUBSTITUTION OF SULPHATE IONS IN THE HYDROGARNET PHASE
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Šauman Zdeněk 1, Černá Jarmila 1, Lach Vladimír 2,
Valtr Zdeněk 3
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1 Research Institute of Building Materials, 617 00 Brno 17, Hněvkovského 65
2 Technical University, 662 38 Brno, Gorkého 7
3 Slovak Technical University, Bratislava, Jánská
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A 1 : 1 by wt. mixture of mullite (3Al₂O₃.2SiO₂) with CaO reacts under hydrothermal conditions producing a hydrogarnet phase having the composition 3CaO.Al₂O₃.SiO₂.4H₂O. When a graded amount of CaSO₄.2H₂O (15 and 20 % respectively) is added to the starting components before autoclave treatment, the reaction yields hydroxylellestadite Ca₁₀(SiO₄)₃(SO₄)₃(OH)₂ together with "soluble" anhydrite CaSO₄ (III). lt was shown at the same time that approximately up to 4 % SO₃ can be substituted in the crystal lattice of the hydrogarnet phase.
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