Mechanochemical synthesis of tobermorite by wet grinding in a planetary ball mill

Wet grinding of mixtures of calcium hydroxide and silica gel with different molar ratios (Ca/Si) ranging from 0.5 to 3.0 was conducted in a planetary ball mill. Three hours of wet grinding enables us to synthesize tobermorite mechanochemically when the molar ratio of the mixture is controlled at abo...

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Bibliographic Details
Published inPowder technology Vol. 93; no. 1; pp. 77 - 81
Main Authors Mi, Guomin, Saito, Fumio, Hanada, Mitsuo
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.09.1997
Elsevier
Subjects
Ball mills
Calcium hydroxide
Calcium silicate hydrate
Chemistry
Exact sciences and technology
Grinding
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
Mechanochemistry
Silica gel
Tobermorite
Wollastonite
Wollastonite
Tobermorite
Silica gel
Calcium silicate hydrate
Grinding
Calcium hydroxide
Mechanochemistry
Ball mills
Scanning electron microscopy
Planetary mill
Ball mill
Thermogravimetry
Differential thermal analysis
Experimental study
Dispersive spectrometry
X ray diffraction
Mechanical activation
Wet grinding
Characterization
Calcium Hydroxides
Calcium Hydroxosilicates
Preparation
Hydrates
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Summary:Wet grinding of mixtures of calcium hydroxide and silica gel with different molar ratios (Ca/Si) ranging from 0.5 to 3.0 was conducted in a planetary ball mill. Three hours of wet grinding enables us to synthesize tobermorite mechanochemically when the molar ratio of the mixture is controlled at about unity, while calcium silicate hydrate-(B) (CSH (B)) is mechanochemically synthesized within about 1.5 h. The presence of excess water, by about four times the mixture's weight in the mill, leads effectively to the mechanochemical synthesis of tobermorite by grinding. Tobermorite synthesized mechanochemically shows similar thermal behavior to that synthesized hydrothermally. However, crystallinity of the former compound is slightly inferior to that latter one. The ground mixture containing tobermorite is thermally decomposed at about 1120 K, forming wollastonite via an amorphous phase, while the mixture with synthesized CSH (B) is decomposed at about 1100 K, forming ϵ-wollastonite via a transitional crystalline phase.
ISSN:0032-5910
1873-328X
DOI:10.1016/S0032-5910(97)03261-0