ABSTRACT OF THE DISCLOSURE
A process for producing a solution of sodium meta
silicate which consists of mixing together an aqueous
sodium silicate solution containing between about 50 to
about 65 weight percent dissolved solids. The sodium
oxide silica dioxide molecular ratio is adjusted to be
about 1:2 to about 121.5. Thereafter, an aqueous solu
tion containing 50 to about 73% sodium hydroxide is
added to the sodium silicate solution to provide a re
sultant sodium metasilicate solution containing about 50
to 60 weight percent dissolved solids with a molecular
ratio of sodium oxide to silica dioxide of 1:1. Sodium
metasilicate pentahydrate is readily crystallized from the
solution when the weight percent of dissolved solids is
between about 57 and 58.