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Process for the Separation and Purification of Hafnium and Zirconium

a technology of hafnium and zirconium, which is applied in the direction of separation processes, titanium compounds, solvent extraction, etc., can solve problems such as the discontinuity of plant operation

Active Publication Date: 2009-05-07
CO EUROPENNE DU ZIRCONIUM CEZUS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This process effectively produces hafnium and zirconium fractions with metal zirconium contents of less than 100 molar ppm and hafnium contents of less than 50 molar ppm, enabling continuous operation and high-purity recovery of hafnium, addressing the limitations of existing methods.

Problems solved by technology

An industrial plant operating in accordance with the principle may be reconditioned in order to treat this residual fraction and recover the hafnium, resulting in discontinuous operation of the plant.

Method used

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  • Process for the Separation and Purification of Hafnium and Zirconium
  • Process for the Separation and Purification of Hafnium and Zirconium
  • Process for the Separation and Purification of Hafnium and Zirconium

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Embodiment Construction

1.1 Organic Products

1.1.1 Zirconium and Hafnium Source

[0110] The zirconium / hafnium separation studies were carried out, on the one hand, from zirconium and hafnium tetrachlorides obtained after carbochlorination (Zr / Hf ratio by weight: 97.5 / 2.5), then extractive distillation.

[0111]FIG. 6 illustrates the equipment in which the extractive distillation leading to the separation of ZrCl4 and HfCl4, according to the teaching of FR-A-2 250 707 and FR-A-2 629 360, is carried out.

[0112] The installation comprises a means 1 for feeding a distillation column 2, with zirconium tetrachloride vapours containing hafnium tetrachloride (temperature between 430 and 550° C.). A pump 7 upwardly circulates the extraction solvent according to the invention in the distillation column, in a counter-current to the stream of the zirconium and hafnium tetrachloride vapours. When the circuit is closed, this solvent passes through the absorber 8, the column 2, the boiler 3, the stripping column 5 and the...

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Abstract

A process for the separation and purification of hafnium and zirconium.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a process allowing the separation and purification of hafnium and zirconium. BACKGROUND INFORMATION [0002] Zircon ore contains zirconium, as its major component, and hafnium (generally from 1 to 3% by weight). For its use in nuclear power, after carbochlorination of the ore, zirconium has to be purged as far as possible of hafnium, which is therefore found in the residual fractions of the processes for the purification of zirconium. The hafnium may, in turn, be used, and this necessitates the individual purification thereof. [0003] For example, one of the most effective processes currently used for the purification of zirconium is that known as the process for separation in molten salts or extractive distillation in molten salts (FR-A-2 250 707 and FR-A-2 629 360). This process uses a distillation column having a plurality of plates, each supporting a layer of molten salts. A mixture of ZrCl4 and HfCl4, which is derived ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01G25/00C01G27/00C22B3/00C01G25/04C01G27/04
CPCC01G25/003C01G27/04C01G27/003C01G25/04B01D3/40C22B3/00
Inventor DELONS, LAURENCELAGARDE, STEPHANEFAVRE-REGUILLON, ALAINPELLET-ROSTAING, STEPHANELEMAIRE, MARCPORIEL, LUDOVIC
Owner CO EUROPENNE DU ZIRCONIUM CEZUS
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