Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1977-11-08
1980-10-07
Meros, Edward J.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423329, C01B 3328
Patent
active
042268370
ABSTRACT:
Silicon dioxide containing waste flue dust from the producton of silicon metal and silicon alloys is converted to crystalline zeolite molecular sieves of Type Y by (1) dissolving the flue dust in alkali metal hydroxide solution with the formation of alkali metal silicate solution having the module (SiO.sub.2 :Me.sup.I.sub.2 O) in the range of 4.0:1 to 5.0:1 at a temperature of 60.degree.-110.degree. C.; (2) purifying the thus obtained alkali metal silicate solution from organic constituents by treatment with activated carbon and/or an oxidizing agent and separating the non-decomposable residue from the solution; and (3) reacting alkali metal aluminate solution present at room temperature with the diluted, purified alkali metal silicate solution with a module (SiO.sub.2 :Me.sup.I.sub.2 O) of 4.0:1 to 5.0:1 obtained by steps (1) and (2) and subsequently crystallizing the reaction mixture (SiO.sub.2 :Al.sub.2 O.sub.3 =4-7:1, Me.sup.I.sub.2 O:SiO.sub.2 =0.4-0.7, H.sub.2 O:Me.sup.I.sub.2 O=30-50:1) at a temperature of 75.degree.-100.degree. C. with stirring for a period of 8-48 hours, subsequently filtering to remove the product from the mother liquor, washing and drying to recover a zeolite molecular sieve of Type Y with a Faujasite structure having a degree of whiteness according to Berger (A. Berger, Die Farbe, 8 Nr. 4/6 (1959) 187-202) at 460.mu. in the range of 90-95%.
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Achenbach Karl
Turk Gunter
Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
Meros Edward J.
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