Preparation of solid, crystalline, substantially anhydrous sodium metasilicate

摘要: This invention relates to the preparation of sodium metasilicate. More particularly, this a process for solid, crystalline, substantially anhydrous metasilicate which comprises steps of: (a) reacting an SiO 2 -containing material with concentrated aqueous solution hydroxide in Na O molar ratio from about 1.2:1 1:1.2 under elevated pressure and at temperature, form suspension; (b) filtering suspension step obtain filter cake filtrate; (c) crushing temperature; (d) removing water crushed recover metasilicate; (e) concentrating filtrate (b); (f) returning reaction mixture (a).