Solvent extraction of niobium from alkali solution by methyltrioctylammonium chloride

  • Zhou Kang-gen 
  • Tokuda Masanori 
Metallurgical Separation Science And Engineering


For the purpose of developing an alkali leaching-solvent extraction directly from alkali solution process, the extraction of niobium from alkali solution by long-chain alkyl quternary ammonium salt (methyltrioctylammonium chloride R4NCl) in toluene was investigated. The experiments were carried out under conditions of 25 °C, Nb(V) concentration 0.01 mol/L, pH 10.7–13.8, R4NCI concentration 0.02–0.14 mol/L. It has been found that the distribution ratio of niobium increases with increasing R4NCl concentration and with decreasing KCl concentration, but it shows maximum value at pH value of about 12 and decreases below or above this pH value. Distribution ratio of niobium goes up to over 1 000 in appropriate conditions, and so it has been proved that R4NCl is an effective extractant for extraction of niobium from alkali solution.

Key words

niobium solvent extraction distribution ratio methyltrioctylammonium chloride 


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  1. [1]
    ZHONG Hai-yun, ZHAO Qin-sheng. A hand book for extractive metallurgy of nonferrous metals, rare refractory metals (II) (in Chinese)[M]. Beijing: Metallurgical Industry Press, 1999.Google Scholar
  2. [2]
    ZHOU Kang-gen, TOKUDA Masanori. Study on solubility of Nb2O5 in KOH solution and alkali leaching of niobite[J]. J Cental South University of Technology, 2000, 7(4): 171–174.CrossRefGoogle Scholar
  3. [3]
    Miller G L. Tantalum and niobium[M]. London: Butterworths Scientific Publications, 1959.Google Scholar
  4. [4]
    Cardon P B. Process for recovering niobium and tantalum from ores and ore concentrates containing same[P]. US Patent, No. 3058825. 1962.Google Scholar
  5. [5]
    Spinner B. Etude quantitative de I’hydrolyse des niobates de pottassium[J]. Revue de Chimie Minerale, 1968, 5: 839–868.Google Scholar
  6. [6]
    Jander G, Ertel D. Uber niobsauren und wasserlosliche alkaliniobate-III[J]. J Inorg Nucl Chem, 1960, 14: 85–90.CrossRefGoogle Scholar
  7. [7]
    Jehng J M, Wachs I E. Niobium oxide solution chemistry[J]. J Raman Spectroscope, 1991, 22(2): 83–89.CrossRefGoogle Scholar

Copyright information

© Central South University 2000

Authors and Affiliations

  • Zhou Kang-gen 
    • 1
  • Tokuda Masanori 
    • 2
  1. 1.Metallurgical Separation Science and Engineering Lab.Central South UniversityChangshaChina
  2. 2.Tohoku UniversitySendaiJapan

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