Process for the preparation of amorphous silica

Details Process for the preparation of amorphous silica Process for the preparation of amorphous silica

C - Chemistry, Metallurgy

01

B

C01B 33/12 (2006.01) C01B 33/193 (2006.01) C01B 33/32 (2006.01)

Patent

CA 2086317

- 14 - PROCESS FOR THE PREPARATION OF AMORPHOUS SILICA ABSTRACT OF THE DISCLOSURE The invention provides a process for the production of a high grade amorphous silica having a purity of at least 90% active silica of the formula SiO2.nH2O, comprising the steps of: a. comminuting and wet classification of porcellanite rock to form granules having an average diameter of 200 microns to 8mm; b. combining the resulting granules with NaOH at a temperature of up to 100°C to form a product containing sodium silicates; c. separating a liquid containing the sodium silicates from solid waste; d. adding CO2 to the liquid product to form SiO2.nH2O and Na2CO3; e. washing the resulting product to effect a separation of the precipitated SiO2.nH2O from the soluble Na2CO3; and f. recovering SiO2.nH2O of a purity of at least 90%.

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