TAILIEUCHUNG - Mass Transfer in Chemical Engineering Processes Part 9

Tham khảo tài liệu 'mass transfer in chemical engineering processes part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 190 Mass Transfer in Chemical Engineering Processes Fig. 11. The model prediction of separation factor and experimental results From Figs. 10 and 11 we can see that the predictions of dimensionless concentration in stripping phase and the separation factor agreed with the experimental results. Enhancement of uranium separation from trisodium phosphate Two grades of trisodium phosphate food and technical grades are extensively used for various purposes. Food grade is used as an additive in cheese processing. Technical grade is used for many applications . in boiler-water treatment testing of steel parts after pickling industrial detergents such as degreasers for steels and heavy-duty domestic cleaners. As trisodium phosphate is a by-product from the separation of desired rare earths in monazite processing it is contaminated by some amount of uranium which is often found with the monazite. Uranium is a carcinogen on the other hand it is useful as a radioactive element in the front and back ends of the nuclear fuel cycle therefore the separation method to recover uranium from trisodium phosphate is necessary. For 45-ppm-uranium-contaminated trisodium phosphate solution HFSLM is likely a favorable method as it can simultaneously extract the ions of very low concentration and can recover them in one single operation. Undoubtedly the facilitated transport across the HFSLM accelerates the extraction and recovery of uranium. Eq. 13 shows that uranium species form complex species with Aliquat 336 tri-octyl methyl ammonium chloride CH3R3N Cl- in modified leaching and extraction of uranium from monazite El-Nadi et al. 2005 . TTO-fCO 14- 2ÍNR t Cl íNR ĨTO ÍCO y 1 2Cl CO2 Í13 UO2 CO3 3 2 NR4 Cl NR4 2 UO2 CO3 2 2Cl CO3 13 UOXCOs 4- represents the uranium species 2 NR4 Cl represents general form of Aliquat 336 in liquid membrane and NR4 2 UO2 CO3 2 1 represents the complex species of Aliquat 336 and uranium species in liquid membrane. Roles of Facilitated Transport Through

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