(1. 东北大学 理学院，沈阳 110004;
2. 东北大学 资源与土木工程学院，沈阳 110004;
3. 包头钢铁公司(集团) 选矿厂，包头 014010)
摘 要:
关键字: 尾矿；稀土；重选；碳热氯化；脱氟剂
by carbochlorination
（1. School of Science, Northeastern University, Shenyang 110004, China;
2. School of Resources and Civil Engineering, Northeastern University,
Shenyang 110004, China;
3. Ore-dressing Plant, Baotou Steel (Group) Corporation, Baotou 014010, China）
Abstract:Rare earths in tailings from concentrating mill can be concentrated by gravity concentration. The grades of REO of obtained rare earths concentrate are 18.02% (−74 μm) and 9.19% (+74 μm), respectively. The total recovery of rare earth is 37.26%. Then the rare earth was decomposed by carbochlorination process and the rare earth chloride can be obtained. The chlorinating rate of rare earth is 91.0% for the carbochlorination process at 750 ℃ for 2 h with carbon as reductant, chlorine gas as chlorination agent, and SiCl4 as de-fluorination agent. The XRD analysis result shows that the residues obtained at 750 ℃ are SiO2 and monazite.
Key words: tailings; rare earth; gravity-concentration; carbochlorination; de-fluorination agent
