鄂西某鲕状赤铁矿石工艺矿物学研究

鄂西某鲕状赤铁矿石铁品位为43.50%，铁主要以赤铁矿形式存在，铁在赤铁矿中分布率为96.34%。矿石主要有用矿物为赤铁矿，脉石矿物主要为石英、高岭土和鲕绿泥石。矿石结构主要为针状-纤维棉絮状结构、交代结构、隐晶质结构、鳞片状结构、自形-半自形粒状结构；矿石构造主要为鲕状构造和浸染状结构。赤铁矿主要呈鲕粒状集合体形式产出，直径0.08～0.8 mm；部分呈不规则粒状、细脉状或与脉石镶嵌状形式产出，粒度0.02～0.2 mm，部分小于0.005 mm；少量呈浸染状形式产出，粒度小于0.005 mm。赤铁矿的粒度极细，+75 μm粒级仅占23.87%，-5 μm粒级含量达39.20%。赤铁矿粒度极细，部分胶磷矿呈鲕环或鲕核分布在赤铁矿鲕粒内部，要通过常规选矿工艺实现磷的脱除，需磨细至5~10 μm以下。因此建议采用选冶联合方式进行选矿。

Research on Process Mineralogy of Oolitic Hematite Ore in Western Hubei

The total iron content of oolitic hematite in Western Hubei is 43.50％.The major occurrence form of iron is hematite,and whose distribution is 96.34％.Major valuable minerals are hematite,major gangue minerals are quartz,kaolin and chamosite.The textures are mainly fibrous,flocculence,metasomatic,cryptocrystalline,flaky,and panautomorphic and hypidiomorphic-granular.The structures are mainly entoolitic and disseminated.Most of hematite is output in form of oolite granular aggregate with diameter of 0.08 ～ 0.8 mm.Part of hematite is output in form of irregular granular,thin vein and inlay with granularity of 0.02 ～ 0.2 mm.The rest of hematite is output in form of disseminated with granularity less than 0.005 mm.The hematite particle is very fine.The cumulative granularity distribution larger than 75 μm is merely 23.87％,while the cumulative granularity less than 5 μm is up to 39.20％.The collophanite are present as oolith core and ring inside the oolitic hematite particle.The dressing granularity is less than 5 ～ 10 μm,in order to realize the separation of collophanite from oolitic hematite,combined technique of processing and metallurgy is recommended.