1 Al2O3+(2)OHˉ+(3)H2O=(2)AL(OH)4ˉ2 Al2O3+2NaOH==2NaAlO2+H2O
2H++Al2SO3+4OH-(过量)=2AlSO2-+3H2O
Al2O3+2OH==2AlO2+H2O