【摘要】 研究了氟碳铈矿-独居石混合精矿经AlCl3脱氟和加碳氯化反应提取稀土的工艺及反应机理,考察了反应时间、温度和脱氟剂对稀土提取率的影响.结果表明,在脱氟剂AlCl3存在下,600℃已获高提取率(93%),800℃时氯化反应2h,稀土提取率高达97.4%.采用XRD法分析了不同温度下混合稀土精矿碳热氯化2h后酸不溶物的物相组成,探讨了AlCl3脱氟-碳热氯化法从混合稀土精矿中除氟并提取氯化稀土的反应机理。更多还原

【Abstract】 Carbochlorination reaction mechanism was investigated for extraction of rare earths from mixed bastnaesite-monazite concentrate with AlCl3 as defluorination agent.The effects of reaction time,reaction temperature and defluorination agent on the rare earth extractive yield were investigated.The results show that higher yield(93%) can be obtained at 600℃ with AlCl3 as defluorination agent and the rare earth extractive yield can reach 97.4% at 800℃ for 2 h.The dilute hydrochloric acid-insoluble residue obtained by each carbochlorination reaction was analyzed by XRD method.The reaction mechanism of eliminating fluorine and extracting rare earths from mixed bastnaesite-monazite concentrate by carbochlorination reaction with AlCl3 as defluorination agent was discussed.更多还原