Abstract:
The factors with effects on direct extraction of uranium from uranium oxides powder is studied using supercritical CO
2/TBP-HNO
3 extraction system.The results show that the extraction efficiency of uranium(
EU) is increasing obviously with an increased HNO
3/TBP,and E U is the best at the ratio value of 1.4;Under certain HNO
3/TBP,
EU is direct proportional to the volume of organic phase.The extraction reaction can be divided into three phases: react slowly in initial phase,fast in stable phase and slowly in final phase due to powder condition;As temperature increasing,
EU has maximum value 91.4% at 60℃;As pressure increasing,
EU has maximum value 94.7% at 12 MPa;According to extraction equipment condition,the best separation of extraction products can be achieved in 8 MPa(separation vessel 1) and 5 MPa(separation vessel 2).