中文摘要：

混合稀土元素矿物质由 CaO-NaCl-CaCl2 锻烧的独居石和 bastnaesite 的分解反应借助于 TG-DTA 和 XRD 被学习。结果证明 CaO 分解的矿物质的过程包含二步。第一步在 425 540 ° C 的温度范围发生，并且主要反应是 bastnaesite 分解，即 REOF 反应与生产 RE2O3 和 CaF2 的 CaO，和 Ce2O3 被氧化到 CeO2。在这步期间， CaCO3 在大约 500 ° C 被形成。第二个步骤在 610 700 ° C 的温度范围发生，并且反应是进 RE2O3 的独居石分解， Ca5F (PO4 ) 3 并且 Ca3 (PO4 ) 2 由 CaO 和 CaF2。在这个过程，因为从分解的 CaCO3 的 CaO 举办高化学的活动，分解能力被改进。在锻烧过程，新形成的 Ca5F (PO4 ) 3 制止能气体的化合物逃跑处于良好的竟技状态的氟的符号。混合稀土元素矿物质的分解比率在 700 ° C 到达 90.8% 。

英文摘要：

The decomposition reactions of monazite and bastnaesite mixed rare earth minerals calcined by CaO-NaCl-CaCl2 were studied by means of TG-DTA and XRD. The results show that the process of the minerals decomposed by CaO involves two steps. The first step occurs in the temperature range of 425-540 ℃, and the main reactions are bastnaesite decomposition, i.e. REOF reacts with CaO to produce RE2O3 and CaF2, and Ce2O3 is oxidized to CeO2. During this step, CaCO3 is formed at about 500 ℃. The second step takes place in the temperature range of 610-700 ℃, and the reactions are monazite decomposition into RE2O3, Ca5F（PO4）3 and Ca3（PO4）2 by CaO and CaF2. In this process, the decomposition ability is improved because CaO from CaCO3 decomposing has high chemical activity. In calcining process, the new formed Ca5F（PO4）3 restrains fluorine that can escape in form of gaseous compound. The decomposition ratio of the mixed rare earth minerals reaches 90.8% at 700 ℃.