Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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Solvent extraction of hafnium from thiocyanic acid medium in DIBK-TBP mixed system
XU Zhi-gao1,2, WANG Li-jun2, WU Yan-ke2, CHI Ru-an1, ZHANG Li2, WU Ming1

1. Key Laboratory for Green Chemical Process of Ministry of Education,
Wuhan Institute of Technology, Wuhan 430073, China;
2. Division of Mineral Resources, Metallurgy and Material, s,
General Research Institute for Nonferrous Metals, Beijing 100088, China

Abstract:A novel process for the separation of hafnium from thiocyanic acid medium using the mixture of diisobutyl ketone (DIBK) and tributyl phosphate (TBP) as the extractant was developed. This extraction process was investigated experimentally as a function of the amount of TBP added, acidity, zirconium and hafnium concentrations, salting-out agent, temperature, duration, respectively. The results show that hafnium is enriched in the organic layer and zirconium is in aqueous layer in DIBK-TBP system. Under the optimal technological conditions: TBP addition 20% (v/v), aqueous phase acidity 3.0 mol/L, ammonium sulfate addition 0.8-1.25 mol/L, room temperature and extraction time 10 min, the separation factor of hafnium from zirconium is 9.3.


Key words: diisobutyl ketone (DIBK); zirconium; hafnium; extraction; separation

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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