Silica gel is made by mixing a 10% hydrochloric acid solution with an equal volume of sodium silicate solution with a specific gravity between 1.15 and 1.22 at a temperature between 45-55 degrees C, thoroughly stirring the mixture allows the gel to form, the gel is then washed to remove acid and salt, dried in a heated air current up to 75-120 degrees C and then the temperature is slowly increased to 300-400 degrees C to produce hard solid silica gel.

1. Silica Gel
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5. Silical Gel Pouh making Machine

6. You first get a gel , in between a solid and a
liquid. Then when you dry the gel you’ll get a
hard solid.

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9. • A process of making silica gel
comprising adding a 10% solution of
HCl to an equal volume of sodium
silicate solution having a. specific
gravity between 1.15 and 1.22, the
temperature of the acid and silicate
being between 45 and 55 (3.,
thoroughly stirring same at the moment
of mixing, allowing the gel thus formed
to set, washing saldgel to remove acid
and salt, drying the gel in a current of
air heated to 75l20 (l, and then slowly
increasing the tempera ture to 300400
C.