JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Online ISSN : 1881-1299
Print ISSN : 0021-9592
Safety, Environment and Energy
Effect of Aluminum Ion on Silica Removal from Geothermal Brine by Seeding Method Using Silica Gel
Hajime SugitaRui SuzukiYoshiyuki BandoMasaaki Nakamura
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1998 Volume 31 Issue 3 Pages 462-464

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Abstract
The seeding method using silica gel has been suggested as a way to inhibit silica scale formation. In order to improve the silica removal performance, the effect of coaddition of aluminum ion on the silica removal was experimentally examined. When only aluminum ion solution is added in the supersaturated silica solution, the decrease in silica concentration increases with time. This is because aluminum ion produces aluminosilicate deposits. The decrease in silica concentration becomes larger with increasing aluminum ion concentration or with increasing initial pH. When initial pH is 9, the decrease in silica concentration in the coaddition is larger than three times that in the silica gel addition. The coaddition of aluminum ion is found to improve the performance of silica removal when the initial pH is higher than 8.
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© 1998 The Society of Chemical Engineers, Japan
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