Method for the production of amorphous silica with controlled specific surface area from magnesium silicate ore
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United States of America Patent
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Aug 25, 2020
Grant Date -
Apr 26, 2018
app pub date -
May 5, 2016
filing date -
May 6, 2015
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Abstract
It is provided a process of producing amorphous silica from a raw material, such as serpentine, containing silica comprising the steps of mixing the raw material with a hydrochloric acid solution; leaching the raw material obtaining a slurry comprising a liquid fraction and a solid fraction containing silica and minerals; separating the liquid fraction and the solid fraction; removing the minerals from the solid fraction by magnetic separation producing a purified solid silica; drying the purified solid silica; and heating the purified solid silica to remove hydroxyl groups from the silica surface and reducing specific surface area of the resulting amorphous silica.
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