关键词: 普通铁精粉, 预选抛尾, DR级铁精矿

Abstract: To upgrade the quality of conventional iron concentrate and meet the specifications of DR�grade iron concentrate，this study proposed a combined separation flowsheet including pre-concentration and tailing discarding at a magnetic field intensity of 160 kA / m，ball milling to achieve 90% passing 0.038 mm，one-stage low-intensity rough magnetic separation (160 kA/m)，and concentration by a magnet⁃ ic separation column on the basis of process mineralogy analysis.Test results show that the concentrate with a yield of 79.47%，total Fe grade of 70.18%，and Fe recovery of 84.86% can be obtained. The contents of harmful elements (sulfur and phosphorus) and main gangue components including SiO2，Al2O3，CaO and MgO in the final product all satisfy the quality requirements of DR-grade iron concentrate. High product quality is achieved while ensuring effective recovery of iron resources. This research can provide technical references for upgrading conventional iron concentrate into feedstock for direct reduction ironmaking，and offer a feasible process route and experimental basis for the high-value utilization of similar iron ore re⁃ sources.

Key words: conventional iron concentrate, pre-concentration and tailing discarding, DR-grade iron concentrate