Abstract
The interaction between calcium hydroxide Ca(OH)2 and amorphous silica SiO2, a product of the polycondensation of silicic acids isolated from serpentines (Mg(Fe))6[Si4O10](OH)8, is studied. It is found that hours-long autoclave treatment can be avoided when sodium hydroxide NaOH is added to an initial aqueous suspension prepared from CaO and SiO2, and amorphous calcium hydro- and hydroxosilicates that transform into β-wollastonite upon annealing in the temperature range of 800–815°C can be obtained with common stirring of a suspension heated to the boiling point under the conditions of atmospheric pressure. The mechanism behind the action of NaOH on the interaction of Ca(OH)2 with this SiO2 is determined, and the optimum parameters of synthesis (the molar ratio of the initial substances and the duration of stirring and annealing) are determined.
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