专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

81. 发明专利

JPH01114799A METHOD FOR CONCENTRATING WASTE NITRIC ACID SOLUTION 失效
公开(公告)号：JPH01114799A
公开(公告)日：1989-05-08
申请号：JP27377887
申请日：1987-10-29
申请人： HITACHI LTD
发明人： IZUMIDA TATSUO , SASAHIRA AKIRA , TAKAHASHI MASANORI , KAWAMURA FUMIO
IPC分类号： G21F9/08 , G21F9/00
摘要： PURPOSE:To decrease the concn. of the nitric acid in a waste nitric acid liquid contg. radioactive nuclides in large quantity by a simple technique in a short period of time by subjecting the high-concn. nitric acid after vacuum concentration further to vacuum evaporation while supplying heat-decomposable aq. alkaline soln. CONSTITUTION:The waste nitric acid liquid contg. the radioactive nuclides is supplied from a raw material nitric acid tank 6 into a nitric acid concentrating vessel 1 and is heated by a heater 4. The concentration system supplies the waste liquid from the tank 6 continuously into the vessel 1 evacuated to a reduced pressure by a vacuum evacuation device 10 at the point of the time when the vapor begins to condense in a condenser 8 by passing a mist separator 3 on progressing of the evaporation in said vessel. The system continues the vacuum evaporation while maintaining the specified evaporation rate from the vessel 1 by controlling a power supply 5 for heating the heater. The water and nitric acid evaporating from the vessel 1 are condensed in the condenser 8, are further refined in a nitric acid refining device 11 and are separated to the recovered water and the recovered nitric acid. The concentrated vessel liquid 2 is thereby linearly increased in the concn. of the metal ions of the radioactive nuclides. The concn. of the nitric acid is sharply decreased if the vacuum evaporation is further continued while an aq. soln. of strongly alkaline aliphat. amine is supplied to the vessel from an aq. alkaline soln. tank 15.

IPRDB

热门服务

关于我们

友情链接

联系方式