PROCESS AND FACILITY FOR CONVERTING URANIUM HEXAFLUORIDE INTO URANIUM DIOXIDE

A conversion process comprises steps of hydrolysis of UF6 to uranium oxyfluoride (UO2F2) in a hydrolysis reactor (4) by reaction between gaseous UF6 and dry steam which are injected into the reactor (4), and pyrohydrolysis of the UO2F2 to UO2 in a pyrohydrolysis furnace (6) by reaction of the UO2F2 with dry steam and dihydrogen (H2) gas which are injected into the furnace (6). The hourly mass flow rate for feeding the reactor (4) with gaseous UF6 is between 75 and 130 kg/h, the hourly mass flow rate for feeding the reactor (4) with dry hydrolysis steam is between 15 and 30 kg/h, and the temperature in the reactor (4) is between 150 and 250 DEG C. 转化方法包括以下步骤：在水解反应器(4)中通过注入到该反应器(4)中的气态UF6与干水蒸气之间的反应将UF6水解为氟氧化铀(UO2F2)；和在热水解炉(6)中通过UO2F2与注入到该炉(6)中的干水蒸气和氢气(H2)之间的反应将UO2F2热水解为UO2。供给至反应器(4)的气态UF6的每小时质量流量为75kg/h至130kg/h，供给至反应器(4)用于水解的干水蒸气的每小时质量流量为15kg/h至30kg/h，并且反应器(4)内部的温度为150℃至250℃。