Dissolution of quartz into dilute alkaline solutions at 90°C: A kinetic study

Details Dissolution of quartz into dilute alkaline solutions at 90°C: A kinetic study Dissolution of quartz into dilute alkaline solutions at 90°C: A kinetic study

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1867s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 7, pp.1867-1874

Physics

3

Scientific paper

The rate of dissolution of Fontainebleau sand (pure quartz) into sodium hydroxide solutions (from 0.001 M to 0.5 M) has been determined at 90°C in well-stirred vessels. Dissolution leads to an equilibrium state, controlled by the solubility of quartz in pure water as undissociated silicic acid H 4 SiO 4 . As long as the initial molality of sodium hydroxide does not exceed 0.02 mol · kg -1 , the dissolution leads only to the formation of the three monomeric species H 4 SiO 4 , H 3 SiO 4 - and H 2 SiO 4 2- , while polymers appear in the silica-rich solutions obtained in more alkaline media. The rate of dissolution can be represented by an adaptation of Stöber's model to alkaline solutions; the basic assumption is that the quartz surface is partially covered by a layer of adsorbed silicate ions, which represent an intermediate species between solid and dissolved silica.

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