Abstract: A new kind of efficient collector namely G7 used in direct floatation of bauxite has been developed by Kunming Metallurgy Research Institute.In order to verify its good performance in improving floatation index，resisting low temperature easy defoaming and dewatering，tests have been done by employing it in floatation of a diasporic bauxite from Yunnan Province.The results show that with grinding fineness of 90% -0.074 mm，by adopting the closed circuit process of two roughing-two cleaning-one scavenging，bauxite concentrate with Al₂O₃ grade of 75.51%，recovery of 89.13% and allumina-silica ratio of 15.63，and bauxite concentrate with Al₂O₃ grade of 76.25%，recovery of 90.28% and allumina-silica ratio of 16.68 were obtained at the slurry temperature of 3 ℃ and 20 ℃，respectively.Observations during the experiments together with the index analysis on the concentrate indicates that G7 is a kind of adaptable collector with high performance，high stability under low temperature and high efficiency for bauxite flotation.

Key words: Diasporic bauxite, Desilication, Allumina-silica ratio, New collector G7