Novel uranium dioxide hydrofluorination two-stage full-countercurrent series fluidized bed system

Abstract

The invention belongs to the technical field of uranium dioxide hydrofluorination in the uranium purification and conversion process, and particularly relates to a novel uranium dioxide hydrofluorination two-stage full-countercurrent series fluidized bed system. A feeding hopper is connected with a spiral conveyor A, the spiral conveyor A is connected with a first-stage fluidized bed, the first-stage fluidized bed is connected with a telescopic hopper A, and the telescopic hopper A is connected with a second-stage fluidized bed; the telescopic hopper A is connected with the spiral conveyor B, the spiral conveyor B is connected with the middle hopper, the middle hopper is connected with the spiral conveyor C, the spiral conveyor C is connected with the secondary fluidized bed, the secondary fluidized bed is connected with the telescopic hopper B, the telescopic hopper B is connected with the spiral conveyor D, the spiral conveyor D is connected with the storage tank, and the storage tank is connected with the spiral conveyor E; the spiral conveyor E is connected with the receiving bin, the secondary fluidized bed is connected with the HF heater, the HF heater is connected with the HF preheater, and the HF preheater is connected with the HF evaporator. The method can be used for carrying out hydrofluorination reaction on uranium dioxide and hydrogen fluoride in a system to prepare a qualified uranium tetrafluoride product.

Description

technical field [0001] The invention belongs to the technical field of uranium dioxide hydrofluorination in the process of uranium purification and conversion, and in particular relates to a novel two-stage full-countercurrent series fluidized bed system for uranium dioxide hydrofluorination, which can be used for uranium dioxide and hydrogen fluoride in the system. Hydrofluorination reaction to prepare qualified uranium tetrafluoride products. The important feature of the system is that the fluidized bed is divided into two stages, and the two-stage fluidized bed is filled with gas and solid materials in full countercurrent series contact, rather than the ordinary first-stage bed is a conveying bed, and the second-stage bed is a countercurrent reaction bed. It has the advantages of large production capacity, simple structure, convenient maintenance, low operation and maintenance costs, safety and stability, etc. It can meet the preparation of uranium tetrafluoride products ...

AI Technical Summary

Problems solved by technology

[0004] The existing fluidized bed used in hydrofluorination is a single bed body, so its height is high, up to tens of meters, and the maintenance operation by personnel is complicated

At the same time, there are also two-stage fluidized beds, but the first-stage bed is a conveying bed (gas-solid flow in the same direction), and the second-stage bed is a counter-current bed (gas-solid counter-current contact), and the full counter-current contact has not been realized. The disadvantage is the process production route. Low production capacity, low conversion rate, high tail gas acidity, etc.

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