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

C - Chemistry, Metallurgy

01

B

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

Patent

CA 2114665

ABSTRACT OF THE DISCLOSURE 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 com- prising 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 SiO2 and Na2O 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 hydroxi- de in said dissolution step is in the range of 4% to 14% by weight.

Affiliated with

Also associated with

Rating

Process for the manufacture of pure amorphous silica from rocks 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 the manufacture of pure amorphous silica from rocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the manufacture of pure amorphous silica from rocks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1768912