Abstract
The interaction between calcium hydroxide Ca(OH)2 with hydrated silica gel from serpentines (Mg(Fe))6[Si4O10](OH)8 is studied. Using the hydrated silica gel as SiO2 source allows long autoclave treatment to be avoided and amorphous intermediates to be obtained via conventional stirring of a suspension prepared from the indicated reagents under atmospheric pressure. Their transformation into nanoscale crystals of β-wollastonite upon annealing in the temperature range of 800–850°C is observed.
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