الفهرس Only 14 pages are availabe for public view
 |  | from | 179 |  |  |
| | | from | 179 | | |
Abstract
This thesis is mainly concerned with studies related to the extraction and determination of uranium from 6M HNO3 acid solution using 0.02M triphenylphosphine oxide (TPPO) dissolved in toluene for its separation.
Certain solvents namely such as toluene, benzene, xylene were used as diluents for preparing certain concentrations of the extractant TPPO. It was found that toluene is the most suitable diluent for preparing the extractant solution. The recovery of uranium using toluene as a diluent for TPPO ranges from 98.7 to > 99.9% per single extraction.
The effect of the organic phase; TPPO to aqueous phase ratio (O/A) was studied using certain volume of the organic extractant which was extracted by certain volumes of organic extractant to reach the maximum extraction with minimum volume of the extractant. It was found that, the best aqueous to organic phase ratio is 4:1 (V/V).
The effect of extractant concentration was studied using certain concentrations of organic extractant (0.2, 0.1, 0.05, 0.04 0.02M). It was found that, the best extractant concentration is 0.02M TPPO in toluene at 4:1 V/V aqueous to organic phase ratio which 98.7% of uranium extraction in one shot.
In general, the extraction percentage, %E increases with decreasing the concentration of TPPO from 0.2 to 0.02M to reach 98.7% uranium extraction at 4:1 V/V aqueous to organic phase ratio for one cycle.
The effect of temperature was studied at certain temperatures from 22 to 100oC under constant condition of other factors. It was found that the ambient room temperature 22o±1C can be considered as the best temperature degree which gives 98.7% of uranium extraction per one cycle.
The effect of pH was studied by varying the pH values from 0.5 to 1.0. It was found that with the decrease of pH values, the uranium extraction increases. The best uranium extraction percentage (98.7%) was reached at pH 0.5.
The effect of shaking time was studied on fixing the other affecting parameters. The time periods which were applied during the experiments are 1, 2, 3, 4, 5 and 6min. The uranium extraction was calculated at each time period of shaking. It was found that, the shaking time required to produce uranium extraction of > 99.9% is from 3 to 6min., for all time duration of shaking. Therefore, the best time of shaking was considered 3min which produce > 99.9% of uranium extraction.