Method for preparing uranium tetrafluoride through dry fluorination

Abstract

The invention belongs to a treatment method, and particularly relates to a method for preparing uranium tetrafluoride through dry fluorination. The method comprises the following steps of 1, calcining metal uranium, a uranium compound, a uranium-silicon mixture and the like at high temperature to form oxides, 2, uniformly mixing the oxide obtained by calcining with fluorinating agents such as ammonium fluoride and ammonium bifluoride according to a certain proportion, and 3, putting the mixed materials into a muffle furnace or a converter with a heating function, introducing inert gases such as nitrogen, hydrogen and ammonia gas or reducing gases, and electrifying and heating until the oxides are completely converted into uranium tetrafluoride powder. The method has the remarkable effects that uranium-containing wastewater is prevented from being generated, and the cost is reduced. The method can be applied to preparation of uranium tetrafluoride by taking metal uranium, uranium compounds, uranium-silicon mixtures and the like as raw materials in the fields of nuclear chemical engineering and fuel element manufacturing and recovery treatment of unqualified uranium-silicon mixtures in the fuel element manufacturing process.

Description

technical field [0001] The invention belongs to a treatment method, in particular to a method for preparing uranium tetrafluoride by dry fluorination. Background technique [0002] UF4 powder is an important intermediate product in the manufacturing process of nuclear fuel elements. When UF4 powder is prepared from metal uranium, uranium compounds, uranium-silicon mixture, etc. The uranium process includes processes such as dissolution (hydrolysis), extraction, catalytic precipitation, drying and calcination, and wastewater treatment. The wet preparation process has the disadvantages of long process flow, large amount of reagents, large amount of waste water and residue, and high conversion cost. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing uranium tetrafluoride by dry fluorination. Compared with the traditional wet reaction, the present invention can shorten the preparation process of u...

AI Technical Summary

Problems solved by technology

[0002] UF4 powder is an important intermediate product in the manufacturing process of nuclear fuel elements. When UF4 powder is prepared from metal uranium, uranium compounds, uranium-silicon mixture, etc. The uranium process includes processes such as dissolution (hydrolysis), extraction, catalytic precipitation, drying and calcination, and wastewater treatment. The wet preparation process has disadvantages such as long process flow, large amount of reagents, large amount of waste water and residue, and high conversion cost.