A PROCESS FOR THE PRODUCTION OF URANIUM TRIOXIDE HAVING A LARGE SPECIFIC SURFACE FROM HYDRATED URANYL NITRATE

摘要

PCT No. PCT/FR83/00083 Sec. 371 Date Dec. 5, 1983 Sec. 102(e) Date Dec. 5, 1983 PCT Filed Apr. 29, 1983 PCT Pub. No. WO83/03820 PCT Pub. Date Nov. 10, 1983.A process for the production of uranium trioxide having a large specific surface by the thermal denitration of hydrated uranyl nitrate corresponding to the formula UO2(NO3)2xxH2O, in which 2/=x/=6, characterized in that, in a first stage, the said nitrate is treated in the form of a liquid at room temperature in the range from 160 DEG C. to 260 DEG C. until a solid phase containing at least 55% by weight of uranium is obtained and, in a second stage, the said solid phase is progressively heated to a temperature of at most 600 DEG C. at a heating rate of at most 1000 DEG C. per hour, and is kept at this temperature of at most 600 DEG C. until a second solid phase of UO3 having a large specific surface is obtained. The UO3 product produced has a specific surface of at least 10 m.2g-1.