Abstract
Octyl pyrophosphoric acid (OPPA) solvent is used for the extraction of uranium from wet phosphoric acid both in pilot and commercial plants. It is widely known that the extraction factor K of a OPPA is much higher than for other competing solvent such as octyl phenyl phosphoric acid (OPPA) or diethylhexyl phosphoric acid/trioctyl phosphine oxide (DEHPA/TOPO). However, this solvent is unstable due to the weak bond POP which hydrolyses readily under the influence of time, temperature and contact with acids. The present study investigates the influence of time, temperature, storage time and contact with different acids on the strength of OPPA and has established that the stability decreases with an increases in temperature, storage time and contact with acids.
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