A process for cold hydrochemical decomposition of sodium hydrogen aluminosilicate. The process includes decomposing sodium hydrogen aluminosilicate at low temperature with a chelate to form a solution of soluble compounds and insoluble contaminants; separating the insoluble contaminants from the solution with a coagulator and heating to coagulate the silicic acid and form a silicic acid gel; separating the silicic acid gel to form a silicic acid-free solution; decomposing the silicic acid-free solution to form a precipitate of sodium hydrogen carboaluminate and a mother liquor; separating the precipitate from the mother liquor; concentrating, cooling and regenerating the mother liquor and forming sodium hydrogen carbonate; separating the sodium hydrogen carbonate from the regenerated solution; and calcining the sodium hydrogen carboaluminate at a temperature of about 700 to about 900° C. and forming sodium aluminate.