磷块岩中稀土元素赋存状态研究

Study on occurrence state of rare earth elements in phosphate rock

元素的赋存状态主要有3种形式:独立矿物、类质同象和吸附状态。针对贵州织金地区的磷块岩,通过数理统计分析和化学分析,研究证明了其中稀土元素的赋存状态。即磷块岩中稀土与磷呈正相关,其相关系数为0.982 86,稀土元素部分置换了胶磷矿中的Ca^(2+)后,以类质同象的形式赋存于胶磷矿中;稀土元素以吸附形式存在于粘土矿物或其他矿物中的质量分数很可能在2%~3%之间;数理统计结果证明磷块岩中稀土形成独立矿物的可能性很小。这将为进一步开发利用磷块岩中的稀土资源提供理论指导。

There are three main forms of occurrence of ele ments： independent minerals, isomorphs and adsorption states. In this paper, study is conducted on the occurrence of rare earth elements in Zhijin area, Guizhou by mathematical statistics analy- sis and chemical analysis. The rare earth and phosphorus are pos- itively correlated in the phosphate rock, and the correlation coef ficient is 0. 982 86. Rare earth elements partially replace Ca2＋ in phosphate rock, and then it is stored in the phosphate rock in the form of isomorphism. The content of rare earth elements in clay minerals or other minerals is likely to be between 2% and 3%. The results of mathematical statistics showed that the rare earths in phosphate rock have very little possibility to form independent minerals. This will be of a good theoretical significance for the further development and utilization of rare earth resources in phosphate rock .