Synthesis of Al2O3 with reduced content of impurities of alkaline elements

Synthesis of Al2O3 with a reduced content of impurities of alkaline elements by different treatment ways of NH4AlCO3(OH)2 was investigated. It was found that the hydrothermal treatment of NH4AlCO3(OH)2 lead to boehmite formation and further calcination of that lead to alumina formation with less content of alkaline elements to compare with Al2O3 obtained by roasting and washing of NH4AlCO3(OH)2.