Process for the manufacture of pure amorphous silica from rocks

Details Process for the manufacture of pure amorphous silica from rocks Process for the manufacture of pure amorphous silica from rocks

1994-01-21

1995-08-29

Lander, Ferris

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423340, C01B 33193

Patent

active

054458048

ABSTRACT:
A process for the manufacture of pure amorphous silica from rocks containing non-crystalline silica is described. The process comprises the steps of: (a) dissolution of said rock in an alkaline solution comprising sodium hydroxide and sodium carbonate, obtaining a solution of sodium silicate; (b) precipitation of pure amorphous silica by adding sodium bicarbonate into said sodium silicate and co-producing sodium carbonate, the weight ratio between SiO.sub.2 and Na.sub.2 O in said dissolution step is in the range of between 0.5 to 3.0; and (c) the sodium carbonate solution is transformed into crystalline sodium bicarbonate, by a salting out reaction with sodium chloride, being recycled to the process. According to a preferred embodiment, the alkaline solution is obtained by the caustification of sodium carbonate with calcium hydroxide. The preferred concentration of sodium hydroxide in said dissolution step is in the range of 4% to 14% by weight.

REFERENCES:
patent: 3172727 (1965-03-01), Burke et al.
patent: 3993497 (1976-11-01), Wason
patent: 4113184 (1978-09-01), Loughrie
patent: 4683128 (1987-07-01), Orii et al.
patent: 4762590 (1988-08-01), Engdahl
patent: 5302364 (1994-04-01), Feinblum

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