| http://www.w3.org/ns/prov#value | - Alternatively, metal oxides such as zinc oxide or iron oxide can be used as seed crystals in the sidestream reactor so that the first silica depositions on the oxide crystals form the alternative silica surfaces for subsequent silica deposition.Materials presently preferred for removal of silica in accordance with the invention are pure amorphous silica spheres, and particularly pyrogenically form
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