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采用深度还原法处理镍渣,以电石渣或氧化钙作单一添加剂,通过X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱(EDS)等方法,对比分析了两种添加剂分别作用时所得还原产物中的物相和微观结构特征。结果表明,以电石渣代替氧化钙作单一添加剂进行镍渣深度还原提铁是可行的;两者所得金属精选粉的铁指标变化趋势基本一致,所得还原产物的物相组成基本相同,但微观结构存在差异;电石渣作添加剂时,还原产物内部的金属相成片连接,内部气孔形态不规则,气孔表面形成更密集的金属相层,生成的金属相向气孔表面迁移富集趋势较使用氧化钙时更显著;电石渣作添加剂在二元碱度1.0时,所得金属精选粉的铁品位、铁回收率和铁金属化率分别为91.07%、91.20%和92.35%。
The nickel slag was treated by deep reduction method, and the single additive of carbide slag and calcium oxide was used as a single additive. By means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) The phase and microstructure characteristics of the resulting reduced product. The results show that it is feasible to use calcium carbide slag instead of calcium oxide as the sole additive for deep reduction of nickel slag. The change trend of iron index of the two metal powders is basically the same, and the phase composition of the obtained reduction products is basically the same, but the microscopic The results showed that when the carbide slag was used as additive, the metal phase in the reduced product was connected into a sheet, the internal stomata were irregular, and the denser metal layer was formed on the stomata surface. The migration and enrichment tendency of the formed metal to the stomata surface was better than that of the calcium oxide ; The grade of iron, the recovery of iron and the rate of iron metallization were 91.07%, 91.20% and 92.35% respectively when the carbide slag was used as the additive at binary basicity 1.0.