Bulletin of the Society of Sea Water Science, Japan

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An investigation was carried out on the desorption of uranium from titanium-activated carbon composite adsorbent with acidic eluent by the batch process. The rate of desorption of uranium with acidic eluent depended on temperature, showing an increase as the temperature was raised. But the rate of desorption with acidic eluent was less dependent on temperature than that obtained when mixed eluent of sodium carbonate-sodium hydrogencarbonate was used. The difference of the rate of desorption of uranium in the range of concentration from 0.3 to 0.5N was not found, and the rate of desorption with sulfuric acid was slightly higher than that obtained when hydrochloric acid was used. The amount of dissolved titanium decreased as the ratio of adsorbent to eluent (RAE) was increased. At RAE of 10%, the percentage of dissolved titanium (DTI) was below 0.38% with sulfuric acid, below 0.7% with hydrochloric acid. These values were found to be higher than the ones with the carbonate eluent. The elements except uranium, which were adsorbed on the adsorbent, were eluted simultaneously with acidic eluent. The regeneration of the adsorbent after desorption, therefore, was found to be unnecessary. In a repeated test of adsorption-desorption treatment up to five times, the percentage of uranium adsorbed from natural sea water was approximately constant of.85%. From these results, the application of column process to the desorption of uranium with acidic eluent at room temperature was proposed to be feasible.

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The vapor pressure of water over the solutions containing 1.516-5.415mol/kg magnesium iodide was measured up to about 4,000mmHg by the direct static method. On the basis of the present and five reported data (NaOH, Na₂CO₃, NaCl, NaClO₃ and LiBr) determined in a wide concentration range, the vapor pressure, boiling point elevation (B.P.E.) and heat of vaporization for aqueous electrolyte solutions were correlated to the solute concentration by using an empirical equation.

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