A system for purifying and treating tail gas of fluorination process

Abstract

The invention belongs to the field of uranium conversion, and particularly relates to a purification treatment system of fluorine-containing and uranium-containing process tail gas generated in the uranium hexafluoride production process. According to the provided fluorinated process tail gas purification treatment system, the purification treatment on harmful ingredients in the fluorinated tail gas generated in the uranium hexafluoride production process is realized by a charcoal adsorption-alkali liquor elution technology determined through the groping for a long time; the purified process tail gas reaches the emission standard. The technical method has the advantages that the system structure is simple; the operation is simple and convenient; the control conditions are easily realized; the security coefficient is high, and the like.

Description

technical field

[0001] The invention belongs to the field of uranium conversion, and in particular relates to a purification treatment system for producing process tail gas containing fluorine and uranium in the production process of uranium hexafluoride. Background technique

[0002] During the production of natural UF6, the process tail gas usually contains 0.05% to 0.10% UF 6 , 3% to 7% of fluorine gas and a small amount of hydrogen fluoride and other harmful gases. Therefore, the purification treatment of process tail gas should not only achieve the purpose of recovering uranium, but also prevent the pollution of uranium and fluorine to the environment.

[0003] Common treatment methods for tail gas in fluorination process include solid chemical trap method, UF 4 Absorption method and lye washing method.

[0004] 1) Solid chemical trap method. Commonly used solid adsorbents are charcoal, soda lime and activated CaSO 4 (anhydrous), CaF 2 、Al 2 o 3 Wait. The adsor...

Examples

specific Embodiment approach

[0069] According to the technical route of charcoal adsorption-alkali leaching, the present invention develops a fluorinated tail gas purification treatment system. The specific implementation is as follows:

[0070] 1) Established a fluorinated tail gas purification treatment system. The device is composed of vertical carbon reactor, packed leaching tower, lye tank, shielded pump, monitoring instruments and related pipelines.

[0071] 2) Start the system.

[0072] (1) Fill the charcoal reactor with charcoal. Open the charcoal inlet of the charcoal reactor, and pour (200-250) kg of dry bagged charcoal into the charcoal reactor.

[0073] (2) Turn on the carbon reactor cooling system. Open the valves PW01, PW02, PW03, DR01, DR02, and ensure that the cooling water is unimpeded.

[0074] (3) Add eluent to the lye tank. Inject (1200-1500)mm sodium carbonate solution with a concentration of (3-5)% into the lye tank.

[0075] (4) Open the lye circulation system. Open the inle...

technical field

[0001] The invention belongs to the field of uranium conversion, and in particular relates to a purification treatment system for producing process tail gas containing fluorine and uranium in the production process of uranium hexafluoride. Background technique

[0002] During the production of natural UF6, the process tail gas usually contains 0.05% to 0.10% UF 6 , 3% to 7% of fluorine gas and a small amount of hydrogen fluoride and other harmful gases. Therefore, the purification treatment of process tail gas should not only achieve the purpose of recovering uranium, but also prevent the pollution of uranium and fluorine to the environment.

[0003] Common treatment methods for tail gas in fluorination process include solid chemical trap method, UF 4 Absorption method and lye washing method.

[0004] 1) Solid chemical trap method. Commonly used solid adsorbents are charcoal, soda lime and activated CaSO 4 (anhydrous), CaF 2 、Al 2 o 3 Wait. The adsor...

Examples

specific Embodiment approach

[0069] According to the technical route of charcoal adsorption-alkali leaching, the present invention develops a fluorinated tail gas purification treatment system. The specific implementation is as follows:

[0070] 1) Established a fluorinated tail gas purification treatment system. The device is composed of vertical carbon reactor, packed leaching tower, lye tank, shielded pump, monitoring instruments and related pipelines.

[0071] 2) Start the system.

[0072] (1) Fill the charcoal reactor with charcoal. Open the charcoal inlet of the charcoal reactor, and pour (200-250) kg of dry bagged charcoal into the charcoal reactor.

[0073] (2) Turn on the carbon reactor cooling system. Open the valves PW01, PW02, PW03, DR01, DR02, and ensure that the cooling water is unimpeded.

[0074] (3) Add eluent to the lye tank. Inject (1200-1500)mm sodium carbonate solution with a concentration of (3-5)% into the lye tank.

[0075] (4) Open the lye circulation system. Open the inle...

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