Comparative Study on the Performance of Ca(OH)2 and Mg(OH)2 Spent TBP/OK Suspensions
Direct incineration of nuclear fuel reprocessing process generated in the organic waste stream of tributyl phosphate(TBP)and kerosene(OK)will generate phosphoric acid,which will cause a certain degree of corrosion of the equipment,so in the use of pyrolysis incineration process to deal with the waste stream,need to be blended with a suitable proportion of neutralizing agent and surfactants and other additives,the waste stream is formulated into a uniform and stable suspension.The neutralizer can fix P2O5 in the pyrolysis process to avoid the corrosion of the equipment after the generation of phosphoric acid.In this paper,the influence of Ca(OH)2 and Mg(OH)2 as neutralizers on the performance of TBP/OK suspension was investigated through different single-factor tests to provide a new idea of suspension formulation for pyrolysis incineration system of reprocessing plant.The experimental results showed that the final surface viscosity of the suspensions formulated with Mg(OH)2 at the same TBP content was much higher than that of Ca(OH)2 when the TBP content was 30%and 60%,and the final surface viscosities of Mg(OH)2 and Ca(OH)2 at 30%TBP and 60%TBP were 90.36 mPa·s and 43.42 mPa·s,respectively.The surface viscosities were 95.24 mPa·s and 75.09 mPa·s at 30%TBP,and at 60%TBP,respectively,while the emulsification rate of Mg(OH)2 was significantly better than that of Ca(OH)2,and it possessed better fluidity.The overall stability of the suspension with Mg(OH)2 as the neutralizer was better at different nuclide and DBP contents.
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