关键词: 含钛铁精矿, 降钛, 磨矿, 弱磁选, 淘洗磁选

Abstract: The titanium-bearing iron concentrate in Chengde region has an iron grade of 64.20% and a TiO₂ content of 1.99%. A detailed investigation was conducted on the mineralogical composition of titani⁃ um and the de-titanium process in the concentrate. Phase analysis revealed that titanium mainly exists in the forms of ilmenite，sphene，and rutile，and these minerals are closely associated with magnetite as ag⁃ gregates. When the grinding fineness reaches 90% passing 38 µm，through two-stage low-intensity magnet⁃ ic separation，the TiO ₂ content in the titanium-bearing iron concentrate can be reduced to 0.94%. The yield，recovery and grade of the magnetic concentrate under these conditions are 90.68%，97.96% and 69.30%，respectively. In terms of washing magnetic separation，the effects of different processes-includ⁃ ing single-stage washing magnetic separation，desliming followed by washing magnetic separation，and two-stage washing magnetic separation-on titanium removal were investigated. The results show that after two-stage washing magnetic separation，the TiO₂ content in the concentrate decreases to 0.91%，the iron grade increases to 68.93%，the concentrate yield reaches 81.02%，and the iron recovery is 86.18%. The research results provide a theoretical foundation and experimental basis for the iron enrichment and titani⁃ um reduction processes in titanium-bearing iron concentrate.

Key words: titanium-bearing iron concentrate, titanium reduction, grinding, low intensity magnetic separation, elutriation magnetic separation