TECHNOLOGICAL STUDIES ON THE SCRUBBING STAGE DURING PHOSPHORIC ACID PURIFICATION PROCESS FOR PRODUCTION OF PARTIALLY PURIFIED AND HIGHLY PURE GRADE PHOSPHORIC ACID | ||
| Nuclear Sciences Scientific Journal | ||
| Volume 9, Issue 1, April 2020, Pages 153-174 PDF (1.45 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/nssj.2020.265510 | ||
| Author | ||
| MOSTAFA I. AMIN | ||
| Nuclear Materials Authority- P.O. Box 530 Maadi- Cairo- Egypt | ||
| Abstract | ||
| The production of highly pure grade phosphoric acid is very important due to its high economic value in the different industrial applications. One of the most important purification techniques is solvent extraction method which includes three main stages; extraction of P2O5 followed by scrubbing process of the loaded organic solvent and finally stripping process of the P2O5 using distilled water (DW). Scrubbing stage is considered as the most important stage of this technique that controls the purity degree of the phosphoric acid and also controls the economic cost of the purification process. In this paper, the effect of different added scrubber solutions on the scrubbing process of the tri-butyl phosphate (TBP) loaded organic solvent were studied. In this context, pure phosphoric acid, oxalic acid, sodium hydroxide and DW were studied, and the effects of the different factors on the P2O5 amount loss from the loaded organic solvent such as the concentration of the added scrubber solution, stirring time and added scrubber solution to loaded organic solvent phase ratio were investigated. From the obtained data, DW was considered as the most preferable scrubber and iron was decreased from 40560 ppm to reach 10 ppm only, while Cu, Cd, Mn, Zn, U were not detected and F- was decreased to reach 8 ppm in the highly pure grade phosphoric acid. | ||
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