摘要:
通过光学显微镜、扫描电镜、电子探针、X射线粉晶衍射、X射线荧光光谱及差热—热重分析等手段，对四川攀枝花红格钒钛磁铁矿中钛铁矿的结构与构造、化学组成及变化规律等进行详细的矿物学特征研究。结果表明，钛铁矿与钛磁铁矿紧密共生，呈自形—半自形和它形粒状集合体填充在脉石矿物颗粒间，形成海绵陨铁和粒状镶嵌等结构。钛铁矿以主、客晶两种形式存在。钛铁矿单矿物化学成分分析Fe、Ti、Mg、V、Mn是其主要组成元素；相关性分析表明Fe、Ti、Mg、V、Al元素间相关关系密切。钛铁矿中铁的含量随着其矿物粒度的减小而增加；TiO2、MgO含量则随着钛铁矿粒度的减小而递减。研究结果对于该矿区钒钛磁铁矿中钛精矿的选、冶具有实际应用价值。
Abstract:
Mineralogical characteristics including structures,chemical compositions and changing patterns of ilmenite in Hongge vanadium-bearing titaniferous magnetite in Panzhihua,Sichuan,were detailedly studied by optical microscope,scanning electron microscope(SEM),electron probe micro-analysis(EPMA),X-ray diffraction(XRD),X-ray fluorescence(XRF) and differential thermal analysis-thermogravimetry(DTA-TG).The results indicate that ilmenite in Hongge vanadium-bearing titaniferous magnetite exists in independent mineral particle or ilmenite crystal plate or strip exsolved from solid solution of titaniferous magnetite.The ilmenite in the forms of euhedral-subhedral and anhedral crystal particles and titaniferous magnetite form poikilitic structure or filled in gangue grains to form sideronitic texture or web ring texture.The two types of ilmenite observed by mineral phase analysis were oikocryst and chadacryst.The major chemical compositions of the ilmenite are ferrum(Fe),titanium(Ti),magnesium(Mg),vanadium(V) and manganese(Mn).The correlation analysis indicates that Fe,Ti,Mg,V,and Al are closely related to each other.With the decrease of the ilmenite's particle size,ferrum(Fe) content gradually increases while TiO2 and MgO contents decrease.The results provide significant practical references to ore dressing and separation of the ilmenite in vanadium-bearing titaniferous magnetite in that area.
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