攀西某钒钛磁铁矿中钛磁铁矿的矿物特征研究

Study on the Mineralogical Characteristics of Titano-magnetite of V-Ti Magnetite Ore in Panxi Region

通过X射线衍射分析、矿相显微镜、电子探针、扫描电镜等分析测试手段和线性回归分析方法对攀西某钒钛磁铁矿中钛磁铁矿的矿物组成、化学组成及主要有价组分之间的相关性、内部结构特征进行了系统研究。结果表明,钛磁铁矿的矿物组成主要有钛磁铁矿(68%~90%)、钛铁矿(8%~30%)、钛铁晶石(1%~5%)、尖晶石(0.5%~1.5%)。化学组成主要为铁和钛,其次为钒、铬和锰,还含有少量的钙、镁、铝和硅,部分矿样还含有微量的钴和镍。TFe含量大致为48%~63%,TiO2为14%~30%,V2O5约为1.0%~1.5%,Cr2O3和MnO分别约为0.4%和0.5%。钛和锰元素的含量均与铁元素含量呈显著的一元线性负相关关系,钒和铬均与铁呈显著的一元线性正相关关系。钛磁铁矿矿物颗粒主要呈自形—半自形结构,其内部典型结构特征为固溶体分离结构,其出溶矿物主要是片晶状、板条状或格子状的钛铁矿。研究结果说明该矿区矿石中的钛磁铁矿已达到工业利用的要求,经选别后可作为工业用钛铁精矿,为钛磁铁矿选矿技术路线的制定提供了依据。

The x-ray diffraction phase qualitative analysis,optical microscope,electron probe micro-analyzer,scanning electron microscope and linear regression analysis were employed for the mineral composition,chemical composition and the inner structural feature of the titano-magnetite of V-Ti magnetite ore in Panxi Region in this paper.The results indicated that the main mineral composition of the titano-magnetite was consisted of titano-magnetite(whose content was about 68%~90%),ilmenite(approximate 8%~30%),titanite(approximate 1%~5%) and the spinel(approximate 0.5%~1.5%).The main chemical composition of the titano-magnetite was consisted of iron,titanium,vanadium,chromium and manganese,and with about 48%~63% of TFe,14%~30% of TiO2,1.0%~1.5% of V2O5,0.4% of Cr2O3 and 0.5% of MnO contained in the titano-magnetite.In addition,there were small amounts of calcium,magnesium,aluminum and silicon,and some of which also contain traces of cobalt and nickel.The content of titanium and manganese has a significant linear negative correlation with iron content,and both of the vanadium and chromium have a closely linear positive correlation with iron.The results showed that the titano-magnetite was in forms of hedral-subhedral aggregates,whose internal structural feature was solid solution separation structure,and the dissolved mineral was mainly ilmenite with platylium,lath or lattice.The researches indicate that the titano-magnetite of the mining area has reached the content standards of industrial utilization,and could be used as industrial iron concentrate after sorting,which provide a basis for the formulation of the titano-magnetite beneficiation technology route.