Decomposition Reaction of Mixed Rare Earth Concentrate and Roasted with CaO and NaCl


Wu Wenyuan , Hu Guangyong , Sun Shuchen , Chen Xudong Tu Ganfeng (School of Material and Metallurgy, Northeastern University, Shenyang 110004, China)


<正> The reaction of the mixed rare earth concentrate including monazite ( REPO4) and bastnaesite ( REFCO3) decomposed by CaO and NaCl additives at the temperature range from 100 to 1000 ℃was studied by means of XRD and TG-DTA. The results show that when CaO and NaCl are not added, only REFCO3 can be decomposed at the temperature of 377 -450 ℃. The decomposition products include REOF, RE2O3 and CeO2. However, REFCO3 can not be decomposed. When CaO is added, the decomposition reactions occur at the temperature range from 660 to 750 ℃. CaO has three decomposition functions: (1) REPO4 can be decomposed by CaO and the decomposition products include RE2O3 and Ca3(PO4)2; (2) CaO can decompose REOF, and the decomposition products are RE2O3 and CaF2; (3) CaO can decompose REPO4 with CaF2, and the decomposition products are RE2O3, Ca5F(PO4)3. The decomposition ratio of the mixed rare earth concentrate increased obviously, when CaO and NaCl were added. NaCl can supply the liquid for the reaction, improve the mass transfer process and accelerate the reaction. At the same time, NaCl participated in the reaction that REPO4 was decomposed by CaO.


metallurgy technology; rare earth concentrate; decomposition reaction; calcium oxide; sodium chloride


To explore the background and basis of the node document

Springer Journals Database

Total: 12 articles

  • [1] Wang X T; Liu J J, Oxidation baking decomposition process for baotou mixed RE concentrate, Rare Earth,
  • [2] Qiao J, Dynamics study of roast reaction of mixture of baotou rare earth concentrate and 25% sodium carbonate, Chinese Rare Earth, Chinese Rare Earths (Chinese Rare Earths)
  • [3] Bautista R G; Wong M M, Rare Earths Extraction Preparation and Applications,
  • [4] Wu W Y; Sun S C; Yu Q C, Mechanism of decomposing of rare earth concentrate mixed with monazite and bastnaesite in action of sodium carbonate, Joural of the Chinese Rare Earth Society,


Similar documents

Documents that have the similar content to the node document

Springer Journals Database

Total: 0 articles