添加稀土硝酸盐氟碳铈矿的热分解行为

Behavior of Thermal Decomposition of Bastnaesite with Rare Earth Nitrate Added to It

为了寻求较低温度下分解氟碳铈矿的方法,用TG DTA热分析技术研究了添加稀土硝酸盐(质量分数为5%)后氟碳铈矿的热分解过程,并用XRD方法分别对430℃和510℃下焙烧产物进行了物相分析·研究结果表明:430℃下不添加稀土硝酸盐时,氟碳铈矿只是部分分解,加入稀土硝酸盐后可以完全分解,分解产物主要是REOF,2CeO2·CeF3和少量的4CeO2·Ce2O3;510℃下氟碳铈矿完全分解,加入稀土硝酸盐无明显作用·

To seek the way to enable bastnaesite to be decomposed at lower temperature, process of thermal decomposition of bastnaesite to which 5%(mass fraction) of rare earth nitrate had been added was developed by TG-DTA, and the phase composition of different calcined products were investigated by XRD at 430?℃ and 510?℃ separately. The results showed that bastnaesite is decomposed partly with no oxidant added to it at 430?℃, while it can be decomposed completely with 5%(mass fraction) of the oxidant added to it. The products decomposed are mainly REOF and 2CeO_2·CeF_3 accompanied with a bit of 4CeO_2·Ce_2O_3. On the other hand, bastnaesite can be completely decomposed of 510?℃ on which no apparent effect can be found when adding the oxidant to it.