辽宁某深部铁矿石工艺矿物学特性研究

辽宁某地发现大型深部铁矿体,为了开发利用该矿体,对其进行了工艺矿物学研究。结果表明,矿石中主要含铁矿物为赤铁矿,少量磁铁矿、镁铁矿,微量黄铁矿;铁主要赋存于赤铁矿和磁铁矿中,为选矿回收的主体矿物。赤铁矿矿物含量为32.86%,平均含铁品位69.80%;磁铁矿矿物含量为7.12%,平均含铁品位70.53%,由此计算得铁精矿的理论品位应该达到69.13%,理论回收率为98.19%。赤铁矿主要以自形、半自形晶粒状赋存于石英、白云石等脉石矿物中;磁铁矿常以微细粒形式包裹在赤铁矿中,呈交代残余结构,提高了赤铁矿磁性,这有利于赤铁矿磁选回收。赤铁矿嵌布粒度一般为0.02~1 mm,但大于0.5 mm的赤铁矿很少,大多数赤铁矿粒度小于0.1 mm。磁铁矿粒度一般在0.1 mm以下,大多数集中在0.02~0.05 mm之间。

Process Mineralogy of a Deep Iron Ore from Liaoning

A new large deep iron orebody was found in Liaoning.The process mineralogy of a Deep Iron Ore was investigated for its exploitation and utilization.The results show that the main iron mineral in the ore is hematite with subordinately magnetite and magnoferrite and rarely pyrite.And the iron is hosted by hematite and magnetite,which are separated and used from the iron ore.The mineral content of hematite with average Fe grade of 69.80% in the iron ore is 32.86% and then the average Fe grade 70.53% of magnetite is 7.12%,thus,the grade and recovery is up to 69.13% and 98.19% respectively in theory.The hematite with idiomorphic and allotriomorphic granular texture is occurred in such gangue mineral as quartz,dolomite,et al.On the other hand,the fine magnetite is often coated in hematite to form a metasomatic relict texture,which enhance the ferromagnetic property of hematite so as to upgrade hematite by magnetic separation.The particle size of hematite with uniform diameters vary from 0.02 mm to 1 mm,however,the particle size of more than 0.50 mm was little.The particle size of magnetite is less than 0.1 mm,and it changes between 0.02 mm and 0.05 mm.