Tail gas treatment method of hydrofluorination process

Abstract

The invention belongs to the technical field of treating tail gas from the process of generating uranium tetrafluoride from natural uranium dioxide through hydrofluorination, and particularly relates to a hydrofluorination process tail gas treatment method. Cooling water is introduced to internally cool a condenser, and after being cooled, the condenser is switched into a production system and used for condensing hydrofluorination process tail gas; condenser liquid is sampled once at the interval of one hour to analyze the content of hydrogen fluoride in condensate until the content is kept at 5-15%; when the cooling water outlet temperature is higher than 35 DEG C, the flow of cooling water is adjusted to increase by 5 m<3> / h for each 5 DEG C increase in temperature will raise, and the adjustment is the same as that of 5DEG C temperature raise if the temperature is raised less than 5 DEG C; an inlet and outlet valve, located above the condenser, of a temporary storage tank is switched on to receive hydrofluoric acid; the acidity of non-condensable gas is analyzed, and the acidity value should be smaller than 2%; the process tail gas flow change is observed all the time; the liquid change of hydrofluoric acid in the temporary storage tank is monitored, when the volume reaches 70%, a shield pump is started to pump hydrofluoric acid into a hydrofluoric acid storage tank to recover and treat hydrofluoric acid. System tail gas can be completely treated by means of the hydrofluorination process tail gas treatment method, and the influence on the environment can be ignored.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment in the process of generating uranium tetrafluoride by hydrofluorination of natural uranium dioxide, and in particular relates to a tail gas treatment method of the hydrofluorination process. Background technique [0002] During the production of natural uranium tetrafluoride, the process tail gas is very harmful to personal safety and the surrounding environment. It is an important technology to deal with the tail gas of hydrofluoride process in the production of UF4, especially the treatment of HF in the tail gas. [0003] At present, there are mainly two types of treatment methods for the tail gas of the hydrofluorination process in foreign countries: one is to neutralize hydrogen fluoride directly with lye, and lye KOH and NaOH solutions are often used, and ammonia water and milk of lime can also be used. The second is to recycle hydrogen fluoride to make hydrofluoric acid of differ...

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Problems solved by technology

However, this method requires stricter control conditions, including larger HF concentration, etc.

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