Preparation of solid, crystalline, substantially anhydrous...

Details Preparation of solid, crystalline, substantially anhydrous... Preparation of solid, crystalline, substantially anhydrous...

C - Chemistry, Metallurgy

01

B

23/189

C01B 33/32 (2006.01)

Patent

CA 1159228

K-6364 WHD:elg ABSTRACT OF THE DISCLOSURE This invention relates to the preparation of sodium meta- silicate. More particularly, this invention relates to a process for the preparation of solid, crystalline, substan- tially anhydrous sodium metasilicate which comprises the steps of: (a) reacting an SiO2-containing material with a concentrated aqueous solution of sodium hydroxide in an SiO2 to Na2O molar ratio of from about 1.2:1 to 1:1.2 under elevated pressure and at an elevated temperature, to form a sodium metasilicate suspension; (b) filtering the suspension from step (a) to obtain a filter cake and filtrate; (c) crushing the filter cake from step (b) at elevated temperature; (d) removing water from the crushed filter cake to recover substantially anhydrous sodium metasilicate; (e) concentrating the filtrate from step (b); and (f) returning the concentrated filtrate from step (e) to the reaction mixture of step (a). -A-

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