National Academy of the Republic of Armenia

Yerevan, Armenia

National Academy of the Republic of Armenia

Yerevan, Armenia

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Beglaryan H.A.,National Academy of the Republic of Armenia | Zulumyan N.H.,National Academy of the Republic of Armenia | Isahakyan A.R.,National Academy of the Republic of Armenia | Gabrielyan A.A.,National Academy of the Republic of Armenia | Terzyan A.M.,National Academy of the Republic of Armenia
Russian Journal of Applied Chemistry | Year: 2015

Two-stage method for synthesis of β-wollastonite via reaction of calcium hydroxide and silica formed from silicate layers of serpentine and calcination of the resulting compounds was examined. It was found that the specific structural features of the silica used for this purpose make it possible to avoid a many hours' autoclave treatment and obtain such amorphous calcium hydro- and hydroxo-silicates that are converted under annealing, beginning at 800-810°C, to β-wollastonite by mixing a suspension of Ca(OH)2, SiO2, and H2O heated to its boiling point under atmospheric pressure. The optimal synthesis parameters, molar ratio of the starting substances and agitation duration, are determined. © 2015 Pleiades Publishing, Ltd.

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