Reaction device for uranium fluorination reaction in molten salt system and operation method thereof

Abstract

The invention discloses a reaction device for a uranium fluorination reaction in a molten salt system and an operation method thereof. The reaction device comprises a fluorination reactor, and is characterized in that the inner wall surface of the fluorination reactor is provided with a crucible lining with the thickness being 2-5 mm, wherein the crucible lining is a nickel metal crucible lining,a nickel-based alloy crucible lining, a ceramic crucible lining or a graphite crucible lining; a filter is arranged on a pipeline where a gas product outlet of the fluorination reactor is located; a filter filler in the filter is fluoride particles with the grain size being 2-6 mm, the fluoride particles are one or more of sodium fluoride particles, magnesium fluoride particles, barium fluoride particles and potassium fluoride particles; the filling diameter of the filter filler is 3-10 cm; and the ratio of the filling height of the filter filler to the filling diameter of the filter filler is3-10. The reaction device is able to resist double corrosion of high-temperature fluorine salt and fluorine gas without causing blockage of an outlet gas pipe and a valve of the reactor, and long-term safe operation of the reactor can be achieved.

Description

technical field [0001] The invention relates to a reaction device for uranium fluorination reaction in a molten salt system and an operation method thereof. Background technique [0002] Water is not used as a solvent in the dry reprocessing of spent fuel, and the main separation steps are carried out at high temperatures. In addition, the dry reprocessing process of spent fuel has the advantages of resistance to radiation, low criticality risk, and less radioactive waste, and is suitable for processing spent fuel with high burnup and short cooling period. Fluorination and volatilization technology is an important dry post-processing technology, which fluorides low-valence uranium into high-valence fluoride UF through the following reaction 6 : [0003] UF 4 (d)+F 2 (g)→UF 6 (g) [0004] Using UF 6 The low boiling point and volatile uranium can realize the separation and recovery of uranium, and are often used in the fields of conversion of natural uranium, purificati...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome that the fluorination reactor in the prior art cannot resist the double corrosion of high-temperature fluorine salt and fluorine gas, and the solid corrosion products and salt mist entrained by the air flow condense above the reactor and It will lead to the blockage of the outlet gas pipe and valve of the reactor, and then it is difficult to ensure the long-term safe operation of the reactor, and provide a new type of reaction device and its operation method for uranium fluorination reaction in molten salt system

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