Abstract: The medium and low grade rare-earth containing phosphate ore from Zhijin, Guizhou contains francolite (cellophane) which is the main phosphate mineral and dolomite, calcite and quartz which are the main gangue minerals.The test on its grindability was made and the effect of the grind size on the flotation investigated.At a grinding concentration of 70%, the suitable grinding time was 3.5 min and the grinding fineness was 74.9% -75 μm.

Key words: Medium and low grade rare-earth containing phosphate ore, Grinding, Flotation