某高铁铝土矿石铝铁分离试验

大量高铁铝土矿因氧化铁含量高、矿物嵌布关系复杂而处于待开发状态。为确定四川某高铁铝土矿的高效开发利用方案,对还原焙烧—弱磁选提铁—铝溶出的铝铁高效分离回收工艺中主要影响因素——焙烧制度、焙烧产物磨矿细度及弱磁选磁场强度进行了单因素条件试验。结果表明,在还原焙烧试样粒度为0.18~0 mm、配碳系数为2.0、焙烧温度为1 350℃、焙烧时间为20 min、焙烧产物磨矿细度为-0.074 mm占91%、弱磁选磁场强度为60kA/m情况下,可取得铁品位为89.83%、铁回收率为84.08%的金属铁粉,Al2O3浸出率为69.35%,较好地实现了铝、铁分离。

Experiment on Aluminium and Iron Separation of High-Fe Bauxite

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.