Abstract: Through the research on the digestion process of a bauxite ores from laos, found the suitable digestion conditons to this kind ore: under the conditions of digestion temperature 150 ℃, digestion time 40 min, addition of lime 3%, concentration(m/V) of circulating mother liquor caustic alkali 220 g/L, molar ratio of mother liquor sodium oxide to alumina 3.40, proportioning solid content 350 g/L, proportioning molar ratio of sodium oxide to alumina 1.45, the digestion rate of Al₂O₃ can achieve to 80%.

Key words: Lateritic bauxite, Digestion performance, Circulating mother liquor