Abstract
For the purpose of extracting uranium from sea water, a study has been made on the absorption by titanium hydroxide of uranium in simulated sea water.It was found that the HCO-3 ion has a negative effect on uronium absorption when its concentration is higher than 5×10-3 mol/l.The relation between equilibrated uronium absorption and the concentration of uranium in the solution followed Freundlich's formula in the region of low concentration. For a uranium concentration of 3μg/l, the value of equilibrated absorption was about 200μg/g.The absorption efficiency was found to be proportionate to the reciprocal of the granule radius of the titanium hydroxide in the range of 0.27-0.04mm.As eluting reagent, (NH4)2CO3, Na2CO3 and NaHCO3 were studied, of which, 1.5M (NH4)2CO3 was found to give the best results: For the case where 0.5g of titanium hydroxide was used for the absorption, when 4mg of uranium was absorbed, 20ml of 1.5M (NH4)2CO3 eluted 67% of the uranium and 80ml of the same eluting solution eluted 90% of uranium at room temperature. The eluthg efficiency was seen to increase with rising temperature.
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