Effect of mechanical activation procedure on the phase composition of gypsum

Effect of mechanical activation procedure on the phase composition of gypsum

This paper examines the effect of mechanical activation by impact and attrition milling in planetary and ball ring mills on the phase composition of gypsum. Partially dehydrated powders obtained without heat treatment contain up to 60–70% β-CaSO 4 · 0.5H 2 O (impact milling) and up to 40–47% α-CaSO...

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Veröffentlicht in:Inorganic materials 2010-05, Vol.46 (5), p.545-550, Article 545
Hauptverfasser: Kosenko, N. F., Belyakov, A. S., Smirnova, M. A.
Format: Artikel
Sprache:eng
Schlagworte:
Chemistry
Chemistry and Materials Science
Grinding mills
Gypsum
High strength
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Maleic acid
Materials Science
Mechanical activation
Phase composition
Planetary rings
Retarders
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Zusammenfassung:This paper examines the effect of mechanical activation by impact and attrition milling in planetary and ball ring mills on the phase composition of gypsum. Partially dehydrated powders obtained without heat treatment contain up to 60–70% β-CaSO 4 · 0.5H 2 O (impact milling) and up to 40–47% α-CaSO 4 · 0.5H 2 O (attrition milling). On the addition of a set retarder (maleic acid + poly(vinyl alcohol)), such materials acquire high strength during hardening: up to 11–17 MPa in compression and 7–12 MPa in bending.
ISSN:0020-1685
1608-3172
1608-3172
DOI:10.1134/S0020168510050195