Abstract: The comparative study on flotation performance between the new collector TR and the traditional collector of 1231 for reverse flotation of bauxite was made to reveal that TR can realize the reverse flotation separation of kaolinite and diaspore in a wide range of pH value without any adjustment agent added.Moreover, TR consumption can also be lowed by about 50% than 1231.With the conventional adjustment agents, TR made the Al-Si ratio of concentrate at 10.13 and recovery of 77.14%, which are much better than by 1231 as the collector.As well, the concentrate has less foam and is easily defoaming.

Key words: Reverse flotation, Quaternary ammonium salt, Kaolinite, Diaspore