Study of the Interaction between Calcium Hydroxide and Amorphous Silica Obtained from Serpentinites
| Autor: | A. M. Terzyan, S. A. Melikyan, H. A. Beglaryan, A. R. Isahakyan, N. H. Zulumyan |
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| Rok vydání: | 2019 |
| Předmět: |
Calcium hydroxide
chemistry.chemical_element 02 engineering and technology Calcium Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Amorphous solid Autoclave Suspension (chemistry) chemistry.chemical_compound Boiling point chemistry Sodium hydroxide Physical and Theoretical Chemistry 0210 nano-technology Nuclear chemistry |
| Zdroj: | Russian Journal of Physical Chemistry A. 93:924-931 |
| ISSN: | 1531-863X 0036-0244 |
| DOI: | 10.1134/s0036024419050042 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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