Abstract: Tungsten tailings by gravity in Jiangxi contain SiO₂ of 81.14% and molybdenum of 0.022%. Molybdenum mineral mainly occurs in molybdenite with features of medium disseminated granularity-simple dissemination and higher recovery value. In order to ensure the export of tailings as cement raw material, it is the principle to ensure the tailings particle size not dropped significantly in the test, and technical conditions of molybdenum concentration are studied. The tests results showed that molybdenum concentrate with Mo grade of 46.520% and Mo recovery rate of 50.95% are finally obtained by the process of two-stage grinding-one roughing-one scavenging-four cleaning-one scavenging for concentrate and middles back to the flow-sheet in turn.

Key words: Tungsten gravity tailings, Molybdenite, SiO₂, Recovery of molybdenum, Two-stage regrinding