不同粒度下微山稀土矿物颗粒赋存研究

Study on the Occurrence of Rare Earth Mineral Particles in Weishan with Different Particle Sizes

采用工艺矿物学自动分析仪(BPMA)、扫描电子显微镜等先进设备对山东微山稀土矿物中稀土的赋存状态进行了研究。结果表明,矿物中的稀土矿物主要赋存于氟碳酸岩中,极少数赋存于独居石、铈磷灰石中。同时稀土矿物与方解石、天青石、萤石、石英等嵌布十分密切。通过对不同研磨时间的矿物颗粒进行分析,发现稀土矿物颗粒中方解石呈微细胞颗粒分布于稀土矿物颗粒中,很难分离,是造成品位低的重要因素。探究出稀土矿物中氟碳酸盐颗粒的粒度、解离度的变化曲线,发现在粒度分布图中20~50μm处于峰值时解离度达到最大值,是最佳浮选区间,粒度小于20μm解离度反而会下降,影响稀土浮选。

BPMA and SEM were used to study the occurrence state of rare earth minerals in Weishan,Shandong province.The results showed that rare earth minerals existed mainly in fluorocarbons,few in monazite and cerium apatite.At the same time,rare earth minerals and calcite,lapis lazuli,fluorite,quartz embedded very close.Through the analysis of the mineral particles with different grinding time,it is found that the calcite in the rare earth mineral particles is microcellular particles distributed in the rare earth mineral particles,which is difficult to separate and is an important factor causing low grade.The variation curves of the particle size and dissociation degree of fluorocarbon particles in rare earth minerals were explored,and it was found that in the particle size distribution diagram,the dissociation degree reached the maximum value when 20—50μm was at the peak,which was the optimal flotation interval.The dissociation degree would decrease if the particle size was less than 20μm,which affected the rare earth flotation.