Abstract: In response to the challenges of low recovery rate and severe fine mud interference in the beneficiation of a low-grade,high-mud,and finely disseminated iron ore in China,process optimization research was conducted to improve the total iron recovery rate and obtain qualified iron concentrate. Based on the analysis of ore properties,systematic conditional experiments were carried out on grinding fineness,magnetic induction intensity,and screening pretreatment.A screening-stage grinding and separa ⁃ tion process was introduced.The results showed that with a primary rough grinding fineness of 40%pass⁃ ing -0.074 mm,a magnetic separation process consisting of one roughing ,two cleaning,and one scavenging was adopted,with a 0.15mm closed-circuit screening step added between roughing and cleaning.The closed-circuit full-process test ultimately achieved an iron concentrate with a TFe grade of 50.21%,a TFe recovery rate of 66.25%,and a magnetic iron recovery rate of 91.23%.The optimized stage grinding screening-multi-stage magnetic separation process,by controlling grinding fineness to suppress mudding, recovering qualified fine particles in advance through screening ,achieved efficient separation of finely dis ⁃ seminated and easily mudding iron ores.While ensuring the concentrate grade,it significantly improved the metal recovery rate,providing technical support for the industrial utilization of similar or

Key words: low-grade, high-mud, magnetic separation, screening