云南安宁磷矿中稀土元素分布规律和赋存状态研究

磷矿伴生稀土元素是获取稀土资源的重要途径。我国磷块岩型稀土矿分布广，稀土含量高，具有综合回收价值，是仅次于独立稀土矿床的伴生稀土资源。本文主要研究云南安宁磷矿中稀土元素分布规律和赋存状态，并比较了磷矿石中稀土元素总量与磷含量的关系，结果表明磷矿石中稀土氧化物总量为72×10^-6～1 050×10^-6,与磷含量呈一定的正相关关系。另外通过光学显微镜及电子显微镜观察发现，安宁磷矿中缺乏独立的稀土矿物，只在部分海绿石中找到了独立的稀土矿物(可能为独居石和褐帘石)。LA-ICP-MS分析结果表明，胶磷矿单矿物稀土元素含量在770×10^-6～920×10^-6之间，而白云石单矿物稀土元素含量均低于34×10^-6,石英单矿物的稀土元素平均含量为180×10^-6。由于部分独立的稀土矿物的存在，海绿石矿物中稀土元素总量可高达2 947.27×10^-6～3 159.87×10^-6。综合分析结果表明，安宁磷矿中稀土元素主要以类质同像的...

Distribution and occurrence state of rare earth elements in Anning phosphate ore, Yunnan Province

Enrichment of rare earth associated with phosphate ore is an important source to obtain rare earth resources. The phosphorite type rare earth deposits are widely distributed in China. The ore has high recovery value because of its high-content rare earth, which makes the deposits become the associated rare earth resources second only to the independent rare earth deposits. The article mainly does research on the rare earth distribution in the phosphate ore of Anning in Yunnan. The study shows that the total amount of rare earth oxides in the ores is between 72×10^-6 and 1 050×10^-6. The statistical comparison confirms that the concentrations of rare earth elements are positively correlated with the phosphorus content in the phosphate ore. In addition, observing by optical microscope and electron microscope, there are few independent rare earth minerals in Anning phosphate mine, and only independent rare earth minerals (probably monazite and allanite)are found in part of glauconite. The results of LA-ICP-MS indicate that the concentration of rare-earth elements in collophane is between 770×10^-6 and 920×10^-6, and the concentration of rare-earth elements in dolomite is lower than 34×10^-6. The average concentration of rare earth elements in quartz is about 180×10^-6. The concentration of rare earth elements in glauconite is as high as 2 947.27×10^-6~3 159.87×10^-6 due to the existence of independent rare earth minerals. The whole research results show that the rare earth elements in Anning phosphate deposits mainly exist in collophane in the form of isomorphic substitution.