四川冕宁稀土精矿中钍的赋存状态及分布规律研究

利用扫描电镜背散射电子成像技术,微区能谱分析,自动矿物分析软件,对四川冕宁稀土精矿中钍的赋存状态及其分布规律进行了研究。结果发现稀土精矿中存在钍的独立矿物(钍石、铀钍石、铅钍石等),且27.28%的ThO_2存在于钍的独立矿物中,52.46%的ThO_2主要以类质同象形式赋存于稀土矿物(氟碳酸盐矿物、硅酸盐矿物、磷酸盐矿物)中,氟碳酸盐矿物主要为氟碳铈矿、氟碳钙铈矿,硅酸盐矿物主要为硅钛铈矿,二者矿物中ThO_2的平均含量相对较低,磷酸盐矿物主要为独居石,其ThO_2的平均含量明显高于氟碳酸盐矿物和硅酸盐矿物,个别独居石中ThO_2含量高达5.91%;此次研究可为今后充分合理回收稀土精矿中的钍资源提供一定的依据。

Study on the Occurrence and Distribution of Thorium in Mianning

Using scanning electron microscopy (SEM)backscattered electron imaging technology, micro energy spectrum analysis, automatic mineral analysis software, The occurrence and distribution of thorium in Mianning rare earth concentrate in Sichuan were studied.It is found that there are independent minerals of thorium (thorium, uranothorite, plumbothorite, etc.).and 27.28% of ThO2 exists in the independent minerals of thorium,52.46% of the ThO2 mainly in the form of isomorphism in rare earth minerals (fluoro-carbonate minerals, silicate minerals, phosphate minerals),the fluoro-carbonate minerals are mainly composed of bastnaesite and synchysite,the