Abstract
With the view to studying the possibility of separating uranium from sea-water by coprecipitation, the carrier properties of ferric, aluminium and titanium hydroxides were examined, with the following results:(1) The values of pH at which uranium started to coprecipitate with the carriers were 4.5 for ferric hydroxide, 5.0 for aluminium hydroxide and 2.8 for titanium hydroxide.(2) Optimum pH values for decarbonated sea-water to obtain maximum recovery of uranium were 8-9 for aluminium and ferric hydroxides, and 4.5-9 for titanium hydroxide with natural sea-water, the values were appreciably lower for ferric and aluminium hydroxides, but unchonged for titanium hydroxide.(3) In the case of ferric and aluminium hydroxides, the coprecipitation ratios of uranium were much smaller in natural than in decarbonated sea-water. With titanium hydroxide however, uranium coprecipitated with equal ease in natural sea-water as in decarbonated sea-water.(4) Uranium was effectively separated from the carri rs by carbonate salt extraction but not by acid extraction.
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