Answer Posted / himanshu purohit

Generally Three type of silica found.(1)suspended (2)
Reactive(which can react with chemical,that is why we can
analysis in laboratory and it is removed by anion
exchanger) (3)non-reactive or colloidal.(can not react with
chemical so that not analysis in lab.and not removed by
anion exchanger.it pass through the anion exchanger)

in high pressure and temp.non-reactive/colloidal silica
converts into reactive silica.

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