抄録
Granulated hydrous titanium oxide (HTO) has been evaluated as the most popular and the most excellent adsorbent for the extraction of uranium from seawater. But, its adsorption velocity has so far been published fragmentarily and to a limited extent. Therefore, the effects of bed condition have been scarcely studied in the earlier feasibility studies.
First, this paper describes a report on the adsorption rate of granulated hydrous titanium oxide which was prepared by using a large scale aparatus for the first time in Japan. The parameters of adsorption rate in an adsorption bed were particle size, temperature of seawater, space velocity and concentration of uranium in seawater. The empirical formula on uranium uptake was shown with Bangham's formula and above parameters. C=14t0.845 (0.6/d')(Co'/0.0033)0.73(0.0235φ+0.41)(0.6Sv0.282).
Second, these empirical formulas were applied to the estimation of outline of the adsorption bed in a fluidizing adsorption system by using multi-layer type, and an example of calculation was shown as 1,000 ton-U of annual uptake. The expansion ratio in the fluidizing bed was estimated by Max Leva's fomulas. The results were shown as the quantity of seawater, the number of pumps, the flow-rate in bed, uranium uptake, the thickness of bed, the interval of layer, the number of layer, the breadth of bed and the total length of facilities. These results show that the plant size will be smaller than the earlier estimations.
