Abstract:The benefieation flotation of fluorite with TXD as depressant was emphasized from theoretical and practical aspeects. The results show that new depressant TXD can depress calcite strongly ,activate fluorite to some extent. The mixture of pure fluorite and calcite can be separated successfully with TXD through two stage cleaners by the result of 73. 8% recovery and fluorite grade97. 5%. In addition , the batch flotation tests have also been conducted on the fluorite ore of ShiZhu yuan Mine containing a lot of quartz and garnet with amphetoric collector 6RO-12 and depressant TXD, a concentrate with fluorite grade 97.56%, fluorite recovery 72. 82% was gainedthrough six stage cleaners. The action mechanism of TXD was studied with zeta potential and X-ray photoelectron spectra. It shows that adsorption and chemical reaction of TXD on calcite surface result in depression of calcite.

Key words: flotution depressant fluorite calcite