Effect of aluminium on the polymerization of silicic acid in aqueous solution and the deposition of silica
- Kyushu Univ., Fukuoka (Japan). Faculty of Science
- West Japan Engineering Consultants, Inc., Watanabedori, Chuo-ku, Fukuoka 810 (JP)
The effect of aluminium on the polymerization of silicic acid was studied at pH 7, 8 and 9 in the aluminium concentration range of 0-26 ppm (Al) by spectrophotometry, gel chromatography and /sup 27/Al NMR. Retarding and accelerating effects of aluminium on the growth of polysilicic acid particles and on the reaction between monosilicic acid and polysilicic acid were observed by changing the pH. It is suggested that the accelerating effect on the reaction between polysilicic acid particles is due to the formation of aluminium hydroxide on the surface of polysilicic acid. The rate of decrease in the monosilicic acid concentration in the presence of aluminium was faster than that in the absence of aluminium at pH 9, because monosilicic acid could be adsorbed rapidly on the aluminium hydroxide. From the results it is presumed that the formation of aluminium hydroxide on the solid surface may accelerate the deposition of silicic acid from geothermal water.
- OSTI ID:
- 5276043
- Journal Information:
- Geothermics; (USA), Vol. 18:1; ISSN 0375-6505
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM
CHEMICAL REACTIONS
SILICA
SILICIC ACID
POLYMERIZATION
AQUEOUS SOLUTIONS
DEPOSITION
GEOTHERMAL SYSTEMS
SPECTROPHOTOMETRY
CHALCOGENIDES
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MINERALS
MIXTURES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SOLUTIONS
150903* - Geothermal Engineering- Corrosion
Scaling & Materials Development
152003 - Geothermal Data & Theory- Rock-Water-Gas Interactions