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以红土镍矿为原料,利用深还原工艺将镍和铁由其矿物还原成金属镍和铁,再通过磁选分离富集得到高品位的镍铁精矿.对深还原焙烧工艺参数进行了优化,得到最佳的工艺条件如下:内配碳量(C/O原子比)为1.3,还原时间为80 min,CaO质量分数为10%,还原温度为1300℃.在此条件下得到的镍铁精矿中镍品位为5.17%,全铁品位为65.38%,镍和铁的回收率分别为89.29%和91.06%.利用X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)对深还原矿及磁选后的镍铁精矿进行了分析,发现深还原矿中出现金属粒,为Ni--Fe合金,镍全部溶于镍铁合金中,铁还有少部分以FeO的形式存在;磁选过程除去大量的脉石,精矿中主要物相为Fe、Ni--Fe、FeO及少量的CaO.MgO.2SiO2.
Using nickel laterite as raw material, nickel and iron are reduced to metal nickel and iron by deep reduction process, and high-grade nickel iron ore concentrate is separated and enriched by magnetic separation. Parameters of deep reduction roasting are optimized , The best technological conditions were obtained as follows: the internal carbon content (C / O atomic ratio) was 1.3, the reduction time was 80 min, the mass fraction of CaO was 10%, the reduction temperature was 1300 ℃ .In this condition, The recovery of nickel and iron were 89.29% and 91.06% for the concentrate with the grade of 5.17% and the grade of total iron of 65.38%, respectively.Using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) The deep reduction ore and magnetic separation after the nickel - iron concentrate were analyzed and found that the deep reduction of metal ore particles appear, as Ni - Fe alloy, nickel all dissolved in the nickel - iron alloy, a small part of the iron in the form of FeO Exists in the magnetic separation process to remove a large number of gangue, the main phase in the concentrate for the Fe, Ni - Fe, FeO and a small amount of CaO.MgO.2SiO2.