白云鄂博霓石型稀土-铁矿石工艺矿物学研究

采用化学分析、物相分析、场发射电镜、矿物分析系统等分析手段对矿石中化学元素、矿物组成、粒度组成和嵌布特征等进行研究。结果表明：矿石中TFe品位为17.50%,稀土REO品位为8.43%,此外,Nb₂O₅含量为0.055%,Sc₂O₃含量为0.0034%,可综合回收；矿石中矿物组成复杂,含铁矿物主要是磁铁矿,含有少量赤铁矿、黄铁矿等,稀土矿物以氟碳铈矿和独居石为主,含有少量黄河矿、氟碳钙铈矿；磁铁矿多以半自形结构及集合体形式产出,磁铁矿集合体中可见霓石和稀土矿物呈细脉状沿磁铁矿颗粒间隙分布,有时可见磁铁矿被霓石沿着边缘及裂隙交代；氟碳铈矿呈细脉状充填于磁铁矿裂隙中或氟碳铈矿集合体中可见脉状霓石和磁铁矿；独居石以椭粒状集合体分散嵌布在霓石中；偶尔可见独居石中包裹黄铁矿；氟碳铈矿和独居石的嵌布粒度较细,0.02mm以下粒级分别占55.87%、85.51%,需要极细的磨矿细度才能单体解离。研究结果对该矿石的高效综合利用具有一定理论指导意义。

Study on Process Mineralogy of Aegirine type Rare Earth-Iron Ore in Bayan Obo

Chemical analysis, phase analysis, field emission electron microscopy, mineral analysis system and other analytical methods were used to study the chemical elements, mineral composition, particle size composition and inlay characteristics of the ore. The results show that the TFe grade in the ore is 17.50%, the rare earth REO grade is 8.43%, in addition, the Nb₂O₅ content is 0.055% and the Sc₂O₃ content is 0.0034%, which can be comprehensively recovered. The mineral composition in the ore is complex. The iron-bearing minerals are mainly magnetite, containing a small amount of hematite, pyrite, etc. The rare earth minerals are mainly bastnaesite and monazite, containing a small amount of huanghoite, parisite. Magnetite mostly appears in the form of semi-automorphic structures and aggregates. In magnetite aggregates, aegirite and rare earth minerals can be seen as fine veins distributed along the gap between magnetite particles. Bastnaesite is filled with fine veins in the cracks of the magnetite or in the aggregate of the fluorsparite. The monazite is dispersed and embedded in the aegirite in an ellipsoidal aggregate; occasionally, the pyrite is wrapped in the monazite. The particle size of the inlay of bastnaesite and monazite is relatively fine, and the particle size below 0.02mm accounts for 55.87% and 85.51% respectively. It requires extremely fine grinding fineness to dissociate the monomer. The research results have certain theoretical guiding significance for the efficient and comprehensive utilization of the ore.