辽宁某含硼铁精矿造团—金属化还原铁—磁选试验

Experiment on Briquetting-Iron Metallic Reduction Roasting-Magnetic Separation of Boron-bearing Iron Concentrate

辽宁某含硼铁精矿主要有价元素为铁、硼,TFe含量为55.55%,B_2O_3含量为4.22%;铁主要以磁铁矿形式存在,硼主要以硼镁石形式存在,杂质矿物主要为蛇纹石和磁黄铁矿。为实现该含硼铁精矿中硼、铁的有效分离,采用造团—金属化还原铁—磁选工艺进行硼铁分离试验。结果表明,制成15 mm×20 mm柱状体团块的含硼铁精矿外配过量的还原煤(n(C)∶n(Fe)=2.5),在还原温度为1 125℃和还原时间为150 min条件下进行焙烧,获得的焙烧产品铁金属化率为88.92%;焙烧产品磨细至-0.074 mm占65%,在磁场强度为80 k A/m条件下弱磁选后,可获得铁品位为92.7%、回收率94.4%的优质铁精矿和B_2O_3含量为14.5%、回收率为84.4%的合格硼精矿,实现了硼铁的有效分离。

There is 55. 55% Fe and 4. 22% B2O3 in a boron bearing iron concentrate from Liaoning. Iron and boron were predominantly in the form of magnetite and szaibelyite,respectively. Meanwhile,serpentine and pyrrhotite were the main gangue minerals. In order to separate iron from boron,an innovative method of combined briquetting followed by metallic reduction roasting and low-intensity magnetic separation was employed. The results showed that the reduced briquettes（ 15 mm × 20mm） with a metallization ratio of 88. 82% were obtained after roasted by excessive coal（ n（ C） ∶ n（ Fe） = 2. 5） at 1 125 ℃for 150 min. Subsequently,iron concentrate containing 92. 7% Fe with recovery of 94. 4% and boron concentrate containing14. 5% B2O3 with recovery of 84. 4% were achieved after ground the reduction products to 65% passing 0. 074 mm and low intensity magnetic separation with magnetic field intensity of 80 k A / m. Effective separation of iron from boron was realized.