关键词: 高铁铝土矿, 还原焙烧制度, 金属化率, 金属铁粉, 浸出率

Abstract: Due to high iron oxide content and complex mineral disseminated conditions，a large number of high-Fe bauxite is to be developed.To determine the high efficient development and utilization of a high-Fe bauxite ore in Sichuan，main factors in the high efficient aluminum and iron separation process of reduction roasting-iron enrichment by low intensity magnetic separation-aluminum dissolution were tested，including roasting system，grinding fineness of calcined product and field intensity of low intensity magnetic separation as single variable factor.The results showed that under conditions of the particle size of reduction roasting sample 0.18 ~ 0 mm，a carbon coefficient of 2.0，calcined at 1 350 ℃，roasting for 20 min，grinding fineness of calcined product 91% -0.074 mm，and magnetic field strength of low-intensity magnetic separation 60 kA/m，the metal iron powder with Fe grade of 89.83%，Fe recovery of 84.08% was obtained，and the leaching rate of Al2O3 reached 69.35%，which preferably achieved the separation of aluminum and iron.

Key words: High-Fe bauxite, Reduction sintering system, Metallization rate, Metal iron powder, Leaching rate