Process for producing silicon-dioxide-containing waste fines...

Details Process for producing silicon-dioxide-containing waste fines... Process for producing silicon-dioxide-containing waste fines...

C - Chemistry, Metallurgy

01

B

252/15

C01B 33/32 (2006.01)

Patent

CA 1095877

ABSTRACT OF THE DISCLOSURE The present invention provides a process for processing silicon-dioxide-containing air-borne waste fines from the produc- tion of metallic silicon and silicon alloys to a crystalline type- A molecular sieve, in which in step I the air-borne waste fines are dissolved in alakli metal hydroxide solution at temperatures in the range from 60 to 110°C while alkali metal silicate solution having a modulus (SiO2 : MeI2O) in the range from 2.0 : 1 to 3.5 : 1 is formed, in step II the alkali metal silicate solution thus obtained is freed from organic components by treatment with active carbon and/or oxidizing agents and that the non- decomposable residue is separated from the solution, and in step III the alkali metal aluminate solution is reacted at room temperature with the dilute purified alkali metal silicate solution obtained according to the steps I and II and having a modulus (SiO2 : Na2O) from 2.0 : 1 to 3.5 : 1, whereupon the reaction mixture ((2.0-4.4) Na2O : A12O3, (1.3-1.8) SiO2 : (90- 120) H2O) is crystallized at temperatures of 90 to 95°C for 6 to 12 hours, followed by filtering washing to pH values of 10 to 11 and drying in order to obtain crystalline zeolitic type-A molecular sieve having a whiteness degree according to BERGER ranging from 90 to 95% at 460 mµ.

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