1
Ross T Harper, James H Johnston, Nicholas Wiseman: Controlled precipitation of amorphous silica from geothermal fluids or other aqueous media containing silicic acid. Tasman Pulp & Paper Co, Geochemistry Research, Nikaido Marmelstein Murray & Oram, January 21, 1997: US05595717 (5 worldwide citation)

A more efficient utilization of geothermal energy by allowing flashing of the produced water to a lower temperature. This is accomplished by causing additional quantities of silica to precipitate out of the geothermal water as particles rather than as scale on process equipment. These particles are ...


2
SILICA PRODUCTS FROM GEOTHERMAL FLUIDS BY REVERSE OSMOSIS. June 29, 2017: US20170182460-A1

The invention concerns a method and apparatus for producing silica concentrates from geothermal fluids containing at least 300 ppm silica, by passing the fluid at a temperature above 80° C. and at a pH reduced to between 4.0 and 7.5 through a reverse osmosis membrane. In the diagram, geothermal flui ...


3
METHOD OF PRODUCTION OF A COLLOIDAL SILICA CONCENTRATE. May 3, 2018: US20180118577-A1

The invention relates to methods of concentration of colloidal silica in geothermal fluids. More particularly, although not exclusively, the invention relates to methods and apparatus for concentrating silica by ultrafiltration to produce a substantially monodisperse colloidal silica concentrate.



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