A method of condensing and collecting uf6

Abstract

The invention belongs to a nuclear fuel preparation method, and specifically discloses a method for collecting UF6, which includes: inputting the UF6 gas mixture obtained by the gas-solid reaction of UF4 and F2 in a vertical fluorination furnace into a first-stage internal cooling and internal heating UF6 condenser, and passing through After condensing and separating most of the UF6, it is then input into the secondary internal cooling and internal heating UF6 condenser to condense and collect the remaining UF6, and the residual gas enters the exhaust gas treatment system to be purified and then emptied; among them, the refrigerant in the internal circulation pipe of the primary condenser is demineralized water , The temperature for receiving UF6 gas is 5-10°C. The present invention adopts demineralized water with low corrosion and no scaling as the secondary refrigerant of the first-stage internal cooling and internal heating type UF6 condenser, which reduces the corrosion of the internal circulation pipe of the internal cooling and internal heating type condenser; the temperature of the receiving gas is changed to 5-10 ℃, reduce the working temperature difference of the internal circulation pipe and reduce the stress corrosion of the internal circulation pipe. The working life of the condenser is extended to more than 1238tU, and the service life can reach more than 10 years; and the UF6 collection rate can still reach more than 99.6%.

Description

A condensate collection UF 6 Methods technical field The invention belongs to nuclear fuel preparation method, be specifically related to a kind of method of collecting UF6. Background technique UF6 is a kind of stable volatile gaseous uranium compound, and it is to make nuclear weapon uranium and nuclear power plant fuel element important raw materials. The preparation of UF6 generally adopts the gas-solid reaction of UF4 and F2 in a vertical fluorination furnace to obtain a UF6 gas mixture (including Including UF6, F2, HF, N2 and metal impurity fluoride gas, etc.), the UF6 gas mixture contains about 30-90% UF6, so The UF6 gas needs to be further collected from the UF6 gas mixture. The method of collecting UF6 gas in industry is condensation There are two methods of solid (referred to as condensation) and liquefaction. Condensation collection is the earliest and most widely used collection method. As follows: the UF6 gas mixture obtained by the gas-solid re...

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Problems solved by technology

Corrosion and perforation of the circulation pipe in the condenser, the general working life is only 120tU

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