辽宁朝阳地区某钒钛磁铁矿中铁精矿的工艺矿物学研究

Study on process mineralogy of vanadium-titanium magnetite concentrate in Chaoyang, Liaoning Province

为了查明辽宁朝阳地区某钒钛磁铁矿磁选铁精矿品位偏低、钛质量分数过高的原因,应用多晶X线衍射仪(XRD)和工艺矿物学参数自动分析系统(BPMA)等分析测试手段,对该铁精矿的化学成分、矿物组成、矿物嵌布特征、有价组分的粒度和赋存状态以及矿物解离度等进行研究。研究结果表明:该铁精矿TFe质量分数为43.75%,二氧化钛质量分数为21.54%;含钛磁铁矿质量分数为63.81%,钛铁矿质量分数为15.02%,两者是铁精矿的主要矿物,此外,还存在少量榍石、闪石、辉石和石英等脉石矿物;该铁精矿平均粒径为21μm,其中一部分含钛磁铁矿和微细粒钛铁矿呈网格状或细脉状紧密连生,并且这2种矿物与脉石矿物之间均存在连生现象;含钛磁铁矿中钛质量分数高(TiO2质量分数约10.99%)以及含钛磁铁矿解离度偏低(约67%)是导致该铁精矿品位偏低、钛质量分数过高的主要原因。该研究可为优化朝阳地区钒钛磁铁矿选铁工艺、实现该类资源的高效利用提供参考。

In order to understand the causes of low grade of iron and high mass fraction of titanium in a magnetic separation iron concentrate from a vanadium-titanium magnetite in Chaoyang, Liaoning Province, a systematical investigation of process mineralogy, including the chemical composition, mineral composition, mineral dissemination characteristics, particle size distribution, occurrence state of valuable components and mineral dissociation degree of the iron concentrate, was carried out by the analysis of polycrystalline X-ray diffraction(XRD) and Bgrimm process mineralogy analyzing system(BPMA). The results show that the iron concentrate contains 43.75%(mass fraction) of total iron(TFe) and 21.54% of titanium dioxide(TiO2), and the titaniferous magnetite and ilmenite are the main minerals, whose mass fractions are 63.81% and 15.02%, respectively. In addition, there are a small amount of gangue minerals in the concentrate, including titanite, amphibole, pyroxene and quartz. The average particle size of the iron concentrate is 21 μm. However, there is still a considerable amount of titaniferous magnetite interlocking with micro-fine ilmenite particles in a state of lattice or fine vein,and parts of the two minerals are also associated with some gangue minerals. The main reasons for the low grade of iron and too high mass fraction of titanium in the concentrate can be attributed to the high mass fraction of titanium(about 10.99% of TiO2) of the titaniferous magnetite and its low dissociation degree(about 67%). The results can provide some valuable referances for optimizing the iron separation process of the vanadium-titanium magnetite in Chaoyang area so as to realize high efficiency utilization of this kind of resources.