This paper shows the study results of using of kaolin containing 37.37 percent Al2O3 in Phu Tho of Vietnam for the production of aluminosilicate polymer by calcination at from 660oC to 710oC for 6h then reacted with sodiumsilicate solution. The composition of sodiumsilicate solution includes: Na2O=921 percent
SiO2 = 37,48 percent
H2O = 53,31 percent. The effects of reaction temperature (40oC to 70oC), reaction time, time of calcination and stiring speed on alumina extraction ware studied. The ratio of reaction composition was prepared (100ml Na2SiO3 + 15ml H2O + 10g kaolin), particle size of kaolin or