Abstract: In order to solve the problem of comprehensive recovery of low-grade molybdenum re⁃ sources in gravity tailings of a tungsten ore dressing plant in Fujian，a systematic laboratory and field bene⁃ ficiation test was carried out. The molybdenum grade of gravity separation tailings is very low (about 0.02%)，and the molybdenum mineral particle size is fine after grinding and classification，so it is difficult to recover. The experimental results of laboratory mechanical stirring flotation machine conditions show that the flotation index is better by using the combined collector of black powder + kerosene. The field produc⁃ tion test was changed to flotation column test. The results showed that the combined process of flotation col⁃ umn roughing-preconcentration and discarding tailings-concentrator concentration-flotation machine multi-stage concentration could make full use of the advantages of flotation column microbubble collection to realize the high-efficiency roughing of micro-fine molybdenum. A large amount of slime and water were removed by preconcentration，and then the concentration of concentrate feed was increased by concentra⁃ tion，which effectively broke through the technical bottleneck that the concentrate grade was difficult to im⁃ prove at low concentration. The closed-circuit test obtained an excellent index of molybdenum concentrate grade of 31.46% and comprehensive recovery of 74.44%. Economic analysis shows that the annual output value of the process is about 18.88 million yuan，the annual pharmaceutical cost is 2.58 million yuan，and the annual economic benefit is 16.299 1 million yuan. The process has successfully realized the efficient and economic recovery of low-grade fine-grained molybdenum resources，significantly improved the comprehen⁃sive utilization level of associated molybdenum in mines，and has important reference value for the recycling of similar tailings.

Key words: low-grade molybdenum ore, microfine particle flotation, flotation column, combined pro? cess