Method for recycling zirconium tetrafluoride to form zirconia

A technology that has been converted into and used, applied in the direction of zirconia, etc., can solve the problems of high corrosiveness, difficulty and improvement of compounds

Inactive Publication Date: 2009-01-21
CO EURO ZIRCONIUM ZIRCONIUM CEZUS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because, the high corrosivity of the compounds present is a difficulty, the effect of which increases with temperature

Method used

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  • Method for recycling zirconium tetrafluoride to form zirconia
  • Method for recycling zirconium tetrafluoride to form zirconia
  • Method for recycling zirconium tetrafluoride to form zirconia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] A horizontal tube furnace was used which was rotated to induce agitation of the reaction mixture. Inside the furnace is the reactor itself, shaped to enable a flow of neutral gas, in this case argon, to entrain and vent the acid gases (HF) that will form. The furnace is equipped with a temperature calibration and regulation system.

[0055] The parameters of the tests carried out are listed in Table 1 below, known to incorporate zirconium tetrafluoride in solid anhydrous form.

[0056] test

Pressure Ar

(bar)

FlowAr

(l.h -1 )

Water for injection

Volume (ml)

duration

(minute)

temperature

(℃)

ZrF 4 quality

(g)

1

0.4

250

500

200

685

9.187

2

0.4

250

500

200

500

8.050

3

0.4

250

500

200

600

8.040

4

0.4

250

500

200

550

8.0...

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PUM

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Abstract

The invention relates to a method for converting ZrF4 into ZrO2 by thermally converting solid ZrF4 and water heated in a reactor, to form ZrO2. The initial weight ratio ZrF4 on water is especially between 1 / 5 and 1 / 500, preferably between 1 / 10 and 1 / 200, more specifically between 1 / 15 and 1 / 100, and said ratio is preferably maintained essentially throughout the conversion. The thermal conversion is carried out at a temperature which is higher than, or equal to, 300 DEG C, especially between 300 and 800 DEG C, preferably between 300 and 600 DEG C, more specifically between 350 and 450 DEG C. The invention especially relates to the recycling of the zirconium alloy stripping baths.

Description

technical field [0001] The present invention relates to a method for recycling zirconium using zirconium tetrafluoride as raw material, in particular this tetrafluoride solution obtained by the zirconium alloy décapage method. Background technique [0002] Fuel assemblies for nuclear reactors, in particular for light water nuclear reactors, generally consist of a bundle of mutually parallel fuel rods secured by a frame comprising, inter alia, longitudinal ducts and transversely positioned grilles-entretoises. [0003] The fuel rods may consist of a zirconium alloy cladding into which fuel pellets are introduced. The conduits of the frame can also consist of zirconium tubes. [0004] Manufacturing zirconium tubes from blanks requires multiple successive cold rolling operations, each followed by an annealing heat treatment. Between each cold rolling operation and subsequent heat treatment, degreasing and chemical pickling operations are carried out on the rolled tube. [00...

Claims

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Application Information

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IPC IPC(8): C01G25/02C23G1/36
CPCC01P2002/72C01G25/02C23G1/36
Inventor L·奇塔洛D·拉萨尔莫尼
Owner CO EURO ZIRCONIUM ZIRCONIUM CEZUS
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