Calcined Bauxite is produced from non metallurgical Bauxite grades with a high diasporic content through sintering in rotary kilns at 1650-1700°C. Al2O3 contents range from 82 %, 86 % to 88 %. Densities range from 2,84 g/cm³, 3,22 g/cm³ to 3,33 g/cm³.