| 摘要 |
Process for the decontamination and adjustment of the pH of uraniferous solutions to make them compatible with the natural environment into which they are liable to be discharged. This process is characterised in that the solutions to be treated which have a carbonate ion concentration higher than approximately 100 mg/l or a bicarbonate ion concentration higher than approximately 300 mg/l or a concentration of carbonate and bicarbonate ions which is higher than approximately 300 mg/l and which contain approximately 1 to approximately 100 mg/l of uranium have added to them: - in a first stage, calcium hydroxide up to pH 12; - in a second stage, an acid to bring the pH to a value of approximately 4; - in a third stage, an aluminium salt, such as sodium aluminate, in sufficient quantity for the uranium still present in the solution to be precipitated, coagulated and adsorbed, under conditions such that the final uranium content obtained should be equal to or lower than approximately 1.8 mg/l and that the final pH of the solutions should be from approximately 5.5 to approximately 8.5. u
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