非洲某特大型铁矿工艺矿物学研究

非洲某特大型铁矿高品位赤褐铁矿矿石铁品位为52.73%,铁主要以赤铁矿、褐铁矿的形式存在,铁在赤褐铁矿中的分布率为90.06%。矿石主要有用矿物为赤褐铁矿,脉石矿物主要为黏土、石英、辉石、水铝氧石。为了给选矿工艺流程的确定提供依据,对高品位赤褐铁矿的矿石进行了工艺矿物学研究。矿石构造主要为块状构造和层状构造,矿石结构主要为斑状结构、粒状结构、针状结构、脉状结构、包含结构。赤铁矿、褐铁矿和含铁黏土工艺嵌布粒度分布较细,在-0.07 mm分布率分别为79.26%、62.93%和58.42%。褐铁矿颗粒中常包裹一些细粒脉石矿物,包体粒径30μm的颗粒占到70%,这部分褐铁矿与脉石关系紧密,不利于褐铁矿的单体解离。通过对高品位赤褐铁矿矿石的工艺矿物学研究可知,样品属于较难选矿石。采用物理选矿方法,回收率应在75%～80%之间,精矿品位很难超过64%。

Supporting design and optimization of large section roadway with straight wall and semicircle archStudyTechnological Mineralogy of an Extra Large Iron Ore in Africa

The iron grade of a super-large scale hematite-limonite ore in West Africa is 52.73%. Iron mainly exists in the form of hematite and limonite, and the distribution rate of iron in hematite-limonite is 90.06%. The main useful minerals are hematite and gangue minerals are clay, quartz, pyroxene and bauxite. In order to provide basis for the determination of mineral processing flow, the process mineralogy of HGH ore was studied. The ore structure is mainly massive structure and layering structure. The ore structure is mainly porphyry structure, granular structure, acicular structure, vein structure and inclusion structure. Hematite, limonite and iron-bearing clay processes have fine disseminated particle size distribution, with the distribution rates of 79.26%, 62.93% and 58.42% at - 0.07 mm, respectively. Some fine gangue minerals are often encapsulated in the limonite grains, and the inclusion particles with a diameter of less than 30 micron account for 70%. This part of limonite is not conducive to the dissociation of limonite monomer because of its close relationship with gangue.