Process for converting silicon dioxide containing waste flue dus

Details Process for converting silicon dioxide containing waste flue dus Process for converting silicon dioxide containing waste flue dus

1977-11-08

1982-01-12

Meros, Edward J.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423329, 423332, C01B 3328

Patent

active

043104967

ABSTRACT:
Silicon dioxide containing waste flue dust from the production of silicon metal and silicon alloys is converted to crystalline zeolite molecular sieves of type A by (1) dissolving the flue dust in alkali metal hydroxide solution with the formation of alkali metal silicate solution having a module (SiO.sub.2 :Me.sub.2.sup.I O) in the range of 2.0:1 to 3.5:1 at a temperature of 60.degree.-100.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 :Na.sub.2 O) of 2.0:1 to 3.5:1 obtained by steps (1) and (2) and subsequently crystallizing the reaction mixture ((2.0-4.4)Na.sub.2 O:Al.sub.2 O.sub.3 ; (1.3-1.8)SiO.sub.2 :(90-120)H.sub.2 O) at a temperature of 90.degree.-95.degree. C. for a period of 6-12 hours, subsequently filtering, washing to pH of about 10-11 and drying to recover a crystalline, zeolitic molecular sieve of type A having a degree of whiteness according to Berger (A. Berger, Die Farbe 8 Nr. 4/6 (1959) pages 187-202) at 460.mu. in the range of 90-95%.

REFERENCES:
patent: 2882243 (1959-04-01), Milton
patent: 3017347 (1962-01-01), Kratz
patent: 3489586 (1970-01-01), Chapman

Affiliated with

Also associated with

Rating

Process for converting silicon dioxide containing waste flue dus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for converting silicon dioxide containing waste flue dus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for converting silicon dioxide containing waste flue dus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1540872