ISSN:
0570-0833
Keywords:
Liquid-liquid extraction
;
Zirconium-hafnium separation
;
Hafnium
;
Zirconium
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The partition equilibria of zirconium and hafnium thiocyanates between water and methyl isobutyl ketone have been studied under various conditions. Since the system shows extremely marked deviations from Nernst's distribution law, the two elements cannot be prepared in a very pure state by a simple multi-stage partition. By the use of suitable additives and a new scheme of material flow, however, a continuous process using 23 mixer settlers has been developed, by means of which ZrO2 containing less than 10 p.p.m. of HfO2 and HfO2 containing only 0.3% of ZrO2 can be obtained from a zirconium-hafnium mixture (hafnium content: 1 to 2%).
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/anie.196600151