Citation: Huifang XIAO, Xiaoqian HU, Xiaofan YE, Lihui LIU, Fen NIE, Yanrong DING, Ying MA, Yanzhu LIU, Yongxiu LI. Coordination-enhanced leaching of bastnaesite from mixed rare earth concentrates and comprehensive recycling of valuable elements[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(1): 141-151. doi: 10.11862/CJIC.20250049 shu

Coordination-enhanced leaching of bastnaesite from mixed rare earth concentrates and comprehensive recycling of valuable elements

Huifang XIAO ¹ ,
Xiaoqian HU ¹ ,
Xiaofan YE ¹ ,
Lihui LIU ¹ ,
Fen NIE ¹ ,
Yanrong DING ² ,
Ying MA ² ,
Yanzhu LIU ^1,, ,
Yongxiu LI ^1,,

1.
Institute of Rare Earths, Nanchang University, Nanchang 330031, China
2.
State Key Laboratory of Baiyun Obo Rare Earth Resources Research and Comprehensive Utilization, Baotou, Inner Mongolia 014000, China

Corresponding author: Yanzhu LIU, yzliu@ncu.edu.cn Yongxiu LI, yxli@ncu.edu.cn
Received Date: 17 February 2025
Revised Date: 17 December 2025

Figures(9)

In this study, aluminum sulfate was used to enhance the leaching of bastnasite in mixed rare earth concentrate (MREC) by sulfuric acid, then triethyloctamine and N₁₉₂₃ were used to extract residual acid and rare earth elements in the leaching solution, sequentially to produce calcium sulfate and cryolite by-products and monazite concentrate. The results show that the strong coordination of Al with F not only strengthens the leaching but also eliminates the generation of HF, which is convenient for the separation and comprehensive recycling of rare earth (RE), F, and Al, and eliminates the environmental impact. For the 100 mesh MREC, the concentrate and RE leaching rates by a mix solution of 3.0 mol·L^-1 H₂SO₄ and 0.3 mol·L^-1 Al₂(SO₄)₃ with a liquid-solid ratio (the ratio of the volume of liquid to the mass of solid in mineral fluid) of 32 mL·g^-1 and a reaction of 135 ℃ and 200 r·min^-1 for 2 h reached 68.00% and 66.91%, respectively. The leaching rate of F^- and the decomposition rate of CaF₂ are 94.42% and 99.3%, respectively. After triethyloctanamine extracted most of the residual acid in the leaching solution, the RE was directly extracted with N₁₉₂₃, and the extraction rate was 97.38%. The RE in the organic phase was stripped by HCl with a stripping rate of 98.05%, and the ratio of Al to RE in the stripping solution was only 0.008 0. The F-Al complex in raffinate was transferred to cryolite by adding an external fluorine source to realize the recovery of F-Al resources.
- rare earth concentrate,
- F-Al coordination,
- enhanced leaching,
- comprehensive recovery
1. [1]
  MA Y, LI N, WANG Q W, YANG Q S. Characteristics and current research situation of rare earth resources in Bayan Obo ore[J]. Journal of the Chinese Society of Rare Earths, 2016, 34(6): 641-649
2. [2]
  LI Y X, ZHU W C, ZHANG L Z, LIU Y Z. Rare earth metallurgy and environmental protection[M]. Beijing: Chemical Industrial Press, 2024: 159-188
3. [3]
  TALAN D, HUANG Q Q. A review of environmental aspect of rare earth element extraction processes and solution purification techniques[J]. Miner. Eng., 2022, 179: 107430 doi: 10.1016/j.mineng.2022.107430
4. [4]
  CHENG S K, LI W B, HAN Y X, SUN Y S, GAO P, ZHANG X L. Recent process developments in beneficiation and metallurgy of rare earths: A review[J]. J. Rare Earths, 2024, 42: 629-642 doi: 10.1016/j.jre.2023.03.017
5. [5]
  WANG M, HUANG X W, FENG Z Y, LONG Z Q, PENG X L, ZHANG Y Q. Progress and trend of green technology in hydrometallurgy and separation of Baotou mixed rare earth concentrate[J]. Rare Metals, 2019, 43(11): 1131-1141
6. [6]
  HU Y W, WANG L M, CAO Z, ZHANG W B. Research progress on rare earth ore metallurgy and separation technology in China[J]. Conservation and Utilization of Mineral Resources, 2020, 40(2): 151-161
7. [7]
  LI J F, LI M, ZHANG D L, GAO K, XU W, WANG H H, GENG J L, HUANG L. Clean production technology of Baiyun Obo rare earth concentrate decomposed by Al(OH)₃-NaOH[J]. Chem. Eng. J., 2020, 382: 122790 doi: 10.1016/j.cej.2019.122790
8. [8]
  LI J F, LI M, ZHANG D L, GAO K, XU W, WANG H H, GENG J L, MA X F, HIANG L. Clean production technology of selective decomposition of Bayan Obo rare earth concentrate by NaOH[J]. J. Clean. Prod., 2019, 236: 117616 doi: 10.1016/j.jclepro.2019.117616
9. [9]
  LI M, ZHANG X W, LIU Z G, WANG M T, LIU J, YANG J P. Mixed rare earth concentrate leaching with HCl-AlCl₃ solution[J]. Rare Metals, 2013, 32(3): 312-317 doi: 10.1007/s12598-013-0034-0
10. [10]
  ZHANG X W, LI M, LIU Z G, HU Y H, WANG M T, LIU J, YANG J P. Complex leaching and kinetics of Baotou mixed rare earth concentrate[J]. The Chinese Journal of Nonferrous Metals, 2014, 24(8): 2137-2144
11. [11]
  XUE H Y, LV G Z, WANG L, ZHANG T A. Review of rare earth extraction and product preparation technologies and new thinking for clean utilization[J]. Miner. Eng., 2024, 215: 108796 doi: 10.1016/j.mineng.2024.108796
12. [12]
  ZHAO J M, PAN F, LIU H Z. An environmental friendly Na₂CO₃-roasting decomposition strategy for the mixed rare earth concentrate[J]. Sep. Purif. Technol., 2016, 168: 161-167 doi: 10.1016/j.seppur.2016.05.036
13. [13]
  HE J H, GAO P, YUAN S, CHENG S K, NING J L, ZHOU Z Y, SUN Y S, LI W B. High efficiency separation of bastnaesite (REFCO₃) and monazite (REPO₄) in mixed rare earth concentrate by heating under N₂ and leaching with HCl/AlCl₃[J]. Hydrometallurgy, 2024, 228: 106338 doi: 10.1016/j.hydromet.2024.106338
14. [14]
  LIU Y Z, DING Z X, KONG W C, WANG K, WANG B, WAN X M, LIU L H, ZHAO Q, LI D P, LI Y X. Evolution of leaching reagents and enrichment recovery technology of ion adsorption rare earths: leaching strategy from impurity suppression to enhancing and selection-enhancing in stages[J]. Journal of the Chinese Society of Rare Earths, 2023, 41(3): 610-622
15. [15]
  YANG L F, LI C C, WANG D S, LI H Y, LIU Y Z, ZHOU X Z, LIU M B, WANG X F, LI Y X. Leaching ion adsorption rare earth by aluminum sulfate for increasing efficiency and lowering the environmental impact[J]. J. Rare Earths, 2019, 37(2): 429-436
16. [16]
  LI M, LI J F, ZHANG D L, GAO K, WANG H H, XU W, GENG J L, ZHANG X Y, MA X F. Decomposition of mixed rare earth concentrate by NaOH roasting and kinetics of hydrochloric acid leaching process[J]. J. Rare Earths, 2020, 38(9): 1019-1029 doi: 10.1016/j.jre.2019.06.012
17. [17]
  HUANG Y K, DOU Z H, ZHANG T A, LIU J. Leaching kinetics of rare earth elements and fluoride from mixed rare earth concentrate after roasting with calcium hydroxide and sodium hydroxide[J]. Hydrometallurgy, 2017, 173: 15-21 doi: 10.1016/j.hydromet.2017.07.004
18. [18]
  LIU Y Z, XIAO H F, LIU L H, YE X F, HU X Q, DING Y R, LI Y X. Selective leaching bastnaesite from bayan obo rare earth concentrate and the recovery process of rare earths, aluminum, fluoride and calcium[J], Metals, 2025, 15(4): 431 doi: 10.3390/met15040431
19. [19]
  HAN K N. Characteristics of precipitation of rare earth elements with various precipitants[J]. Minerals, 2020, 10(2): 178 doi: 10.3390/min10020178
20. [20]
  HU Y W, CAO Z, WANG Z C, ZHANG W B. Experimental study on separation of rare earth and thorium from Baiyun Obo ore by roasting-leaching and extraction-precipitation process[J]. Mining and Metallurgical Engineering, 2020, 40(6): 82-86
21. [21]
  LI Y Y, HU Q Y, LI H Y, LI J, LIU Y Z, ZHOU X Z, LI D P, LI Y X. Rare earths and aluminum: From entanglement to respect with each other[J]. Journal of the Chinese Society of Rare Earths, 2021, 39(3): 479-489
22. [22]
  LI C C, YANG L F, WANG Y, LI H Y, WANG D S, LIU Y Z, ZHOU X Z, WANG X F, LIU M B, LI Y X. Extraction separation of rare earth and aluminum from ion-adsorbed rare earth leaching solution by Primary Amine N₁₉₂₃[J]. Journal of the Chinese Society of Rare Earths, 2019, 37(3): 351-360
23. [23]
  HUNG N T, THUAN L B, THANH T C, THUY N T, TRA D T T, VAN K D, WATANABE M, MIN P Q, THAN H S, VUONG N D, PHUC D V, LEE J Y, JEON J H, JYOTHI R K. Selective recovery of thorium and uranium from leach solutions of rare earth concentrates in continuous solvent extraction mode with primary amine N₁₉₂₃[J]. Hydrometallurgy, 2022, 213: 105933 doi: 10.1016/j.hydromet.2022.105933
24. [24]
  CHEN Z Y, LI Z, CHEN J, KALLEM P, BANAT F, QIU H D. Recent advances in selective separation technologies of rare earth elements: A review[J]. J. Environ. Chem. Eng., 2022, 10: 107104 doi: 10.1016/j.jece.2021.107104
25. [25]
  XU Q H, YANG L F, ZHANG L, LI C C, WANG D S, ZHOU X M, ZHOU X Z, LI Y X. Classification and high efficient leaching of ion adsorption rare earth based on its pH dependence[J]. Chinese J. Inorg. Chem., 2018, 34(1): 112-122
26. [26]
  LI M, ZHANG X W, LIU Z G, HU Y H, WANG M T, LIU J, YANG J P. Kinetics of leaching fluoride from mixed rare earth concentrate with hydrochloric acid and aluminum chloride[J]. Hydrometallurgy, 2013, 140(11): 71-76
27. [27]
  CHEN S L, FENG Z Y, WANG M, ZHAO L S, YU Z H, XIA C, HUANG X W. Leaching kinetic study of sulfuric acid roasted mixed-type rare earth concentrate for reducing the solid-waste production and chemical consumption[J]. J. Clean Prod., 2020, 260: 120989 doi: 10.1016/j.jclepro.2020.120989
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