When the carbon dioxide is excessive, naalo2+CO2+2h2o = Al (OH) 3 ↓+nahco3,

2NaAlO2+ CO2+ 3H2O=2Al(OH)3↓

Ionic equation:

ALO2-+2H2O+CO2=AL(OH)3↓+HCO3-

Or 2al2-+3H2O+CO2 = 2al (OH) 3↓+CO32-