Procedure of Evaluation on Adsorbent for Extraction of Uranium from Sea-Water
1982 Volume 36 Issue 2 Pages 94-100
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1982 Volume 36 Issue 2 Pages 94-100
Experimental procedures on the evaluation of adsorbent for the extraction of urallium from seawater and an analytical method of the data were studied on a granulated hydrous titanium oxideas a representative example. Adsorption system for the evaluation adopted a multi-layer and fluidized adsorption bed. The experiment for the evaluation was carried out by using a small column, 2cm of diameter, for 10 days. The standard condition was 0.6mm of granule size, 25°C of temperature and 10cm of statistic bed thickness. One of the flow rates was set up at Sv=2.5 min-1 and another one was set up at two times or a half of the flow rate. The measurements were carried out on the bed thickness of statistic and fiuidizing state, granule size, flow rate, temperature, adsorption quantities after 5 and 10 days. An empirical formula on adsorption quantity was derived as follows from these data: C=K1tm1K2Svm2. The diference of density between granule and sea-water was decided from grule size, flow rate and expansion ratio by Max Leva's equation. The adsorption ability was expressed by adsorption quantity per unit volume for 10 days at 50% of recovery (standard uranium uptake) or recovery ratio at Sv=2.5min-1 (stalldard recovery). The former could be better because it was applicable to various adsorbents. These results decided the specification of adsorption process, namely the adsorbent inventory and parameters of the design, by application of analytical method to the previous paper. The economical evaluation indicator was mainly composed of the adsorbent inventory, the construction of adsorption bed and the adsorbent supply. These values were obtained from the above experimental results with some premises of unit prices and some others, namely 0.5 of recovery, 0.6mm of granule size, 1.5 times of expansion ratio, 0.8 of post-process recovery, 500m3/s of pump capacity, 0.0033g/m3 of uranium concentration in sea-water, 17×103\/m3 of unit price of collstruction; 170×103\/m3 of unit price of bed, 0.05y-1 of adsorbent supply, etc. An example of the evaluation was shown on a granulated hydrous titanium oxide.
