Method for synthesizing crystalline magnesium silicates from geothermal brine
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United States of America Patent
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Jul 13, 2004
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app pub date -
Apr 22, 2003
filing date -
Apr 22, 2003
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Abstract
Crystalline magnesium silicates are synthesized from silica-containing brines, preferably spent geothermal brines, by mixing the brine with a magnesium-containing compound, adjusting the pH of the resultant mixture between 8.0 and 14, and crystallizing the magnesium silicate from the mixture at a temperature between 50.degree. C. and 200.degree. C. Kerolite is preferably synthesized from brine by adjusting the pH in a range between 9.5 and 10.5 and heating the mixture to between 100.degree. C. and 170.degree. C. to precipitate the crystalline kerolite. The brine remaining after the crystallization step is depleted in silica and can be further processed without significant problems caused by silica scaling.
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