Open AccessJournal Article
Zirconium and hafnium separation without waste generation
A. B. V. Da Silva,P. A. Distin +1 more
TLDR
The history of commercial processes for zirconium/hafnium production and separation is reviewed in this paper, and a new technology is then proposed as a potential alternative for ZIRCONIA/HafNium separation in a simpler, cleaner way than achieved with current processes.Abstract:
The history of commercial processes for zirconium/hafnium production and separation is reviewed. A new technology is then proposed as a potential alternative for zirconium/hafnium separation in a simpler, cleaner way than achieved with current processes. Primary sources of zirconium always contain small amounts of hafnium that must be removed during production of zirconium metal for nuclear applications. This separation is usually carried out by a solvent extraction process, developed in the 1950s, that selectively extracts hafnium, as a thiocyanate complex, using methyl isobutyl ketone (MIBK). Environmental problems inherent to this process are the high aqueous solubility and low flash point of MIBK, and possible gaseous contaminants formation generated by the decomposition of the thiocyanic complexes in hydrochloric acid medium (H 2 S, HCN, mercaptan's formation). The present work shows how these problems could be avoided by using organophosphorous extractants that were unavailable when the MIBK process was developed.read more
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Liquid–liquid extraction and recovery of indium using Cyanex 923
TL;DR: In this paper, the extraction of In(III) from HCl, H2SO4, and HNO3 media using a 0.20μm−l−1 Cyanex 923 solution in toluene is investigated.
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Determination of optimum process conditions for the extraction and separation of zirconium and hafnium by solvent extraction
Mohammad J. Taghizadeh,R. Ghasemzadeh,Seyed Nezameddin Ashrafizadeh,Kamal Saberyan,M. Ghanadi Maragheh +4 more
TL;DR: In this paper, the optimum conditions for extraction of zirconium from hafnium by solvent extraction were studied in the range of 0.1 to 2.0 M for three different acids and TBP, D2EHPA or Cyanex 272 as extractant.
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Solvent Extraction for the Separation of Zr and Hf from Aqueous Solutions
Raju Banda,Man Seung Lee +1 more
TL;DR: In this article, a review mainly focused on the recent extraction and separation studies of Zr and Hf from various acidic aqueous solutions using liquid-liquid extraction is presented.
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Zirconium and Hafnium Separation, Part 1. Liquid/Liquid Extraction in Hydrochloric Acid Aqueous Solution with Aliquat 336
TL;DR: In this paper, the extraction of zirconium and hafnium from aqueous HCl solutions by means of Aliquat 336 in organic diluents was systematically studied.
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Extraction and separation of some 3d transition metal ions using Cyanex 923
TL;DR: In this article, the authors proposed a method for the extraction of different 3D transition metal ions from a toluene solution of Cyanex 923 from different mineral acid media, and the effect of some important parameters such as the concentration of extractant and metal ion and nature of the diluent on the partition of Ti(IV, V(IV), Fe(III), Cu(II), and Zn(II).