关键词: 磁铁矿, 弱磁选, 工业试验, 尾矿

Abstract: To efficiently develop a certain magnetite resource in Anhui，a systematic optimization study of the beneficiation process was conducted through laboratory-scale experiments and industrial trials. In the laboratory phase，the process of low-intensity magnetic roughing（0.22 T）-grinding（-0.074 mm ac⁃ counting for 86.10%）-two-stage magnetic separation（0.14 T）-three-stage magnetic separation（0.14 T） was adopted，achieving an iron concentrate with grade of 66.19% and recovery rate of 89.19%. The indus⁃ trial trials employed the process of stage grinding-low-intensity magnetic separation-fine screening-con⁃ centration magnetic separation. By optimizing parameters such as the mill feed rate，cyclone pressure，and screen aperture size，the final iron concentrate grade reached 65.83% with a recovery rate of 87.60%. The content of harmful impurities such as S and P in the concentrate was extremely low，at 0.025% and 0.029% respectively，meeting industrial smelting requirements. Analysis of tailings particle size and iron phase dis⁃ tribution indicated that iron loss was primarily attributed to non-magnetic minerals such as hematite and li⁃ monite. The research results provide reliable process parameters for the industrial-scale production of this iron ore and offer data support for the resource utilization of tailings.

Key words: magnetite, low intensity magnetic separation, industrial trials, tailings