关键词: 微细粒含磷铁尾矿, 旋流器, 脱泥, 浮选

Abstract: Fine-grained phosphorus-bearing iron tailings are difficult to recover effectively because of their fine particle size and severe sliming，while long-term stockpiling results in resource loss and in⁃ creased environmental burdens. Their comprehensive utilization therefore remains a major challenge in phosphorus resource recovery. In this study，the overflow from a lamella thickener at a mineral processing plant was investigated using an integrated process comprising secondary hydrocyclone desliming，reverse flotation desulfurization，and direct flotation phosphorus recovery. The results showed that，using a Hai⁃ wang FX100 hydrocyclone with a 20 mm underflow spigot，the thickening and desliming process produced an underflow with a solids concentration of 27.03% and a yield of 67.36%. Subsequent treatment through a closed-circuit flotation flowsheet consisting of one roughing，four cleaning，and one scavenging stage yielded a phosphate concentrate with a grade of 28.06% and a recovery of 43.95%. The integrated process exhibited stable operation and relatively low reagent costs，and the resulting concentrate met the required commercial grade. The process effectively recovered phosphorus from fine-grained phosphorus-bearing iron tailings and provides a technical reference for the utilization of similar secondary phosphorus resources.

Key words: fine-grained phosphorus-bearing iron tailings, hydrocyclone, desliming, flotation