Synthesis of δ layered sodium disilicate with high framework stability

In this paper, delta layered sodium disilicate with high framework stability has been synthesized by adding the salts of divalent and trivalent elements, in these salts AlCl3 had the best effect for leaving the phase transformation of delta-Na2Si2O5. XRD, SEM, Ca2+ ion binding capacity and clean experiment were used for measuring their properties. The data proved that Al-delta-Na2Si2O5 had good framework stability. delta phase was still major phase after Al-delta-Na2Si2O5 was treated in hot water (80 degreesC) for 60 minutes. And Ca2+ ion binding capacity may keep at 305 mg CaCO3/g through the treatment. The cleaning experiments showed that Al-delta-Na2Si2O5 had good washing ability.