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AssigneePechiney
InventorsPierre Maurel, Bernard Bosca, Francois Nicolas
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A process for the purification of solutions containing sodium or potassium carbonate, sulphate, hydroxide or hydrogen carbonate, and mainly at least one of the metals belonging to the group formed by vanadium, uranium or molybdenum, in the form of sodium or potassium salts, and inorganic and/or organic impurities, wherein the above-mentioned solutions are completely or partially caustified by the addition of an adequate amount of lime, whereby a first precipitate essentially containing calcium carbonate is separated, and the separated liquor is concentrated by evaporation until the hydroxide content is at most equal to 50%, to cause the production of a second precipitate which essentially comprises sodium or potassium sulphate, then, after separation thereof, a hydroxide-rich liquor is collected. This process is more particularly adapted for treatments of liquors resulting from the alkaline attach of vanadiferous and uraniferous ores.
A process for the purification of an aqueous solution wherein said aqueous solution initially contains (1) a sulphate, a carbonate and a hydroxide or hydrogen carbonate of one of the alkali metals sodium or potassium, and (2) at least one of the metals selected from the group consisting of vanadium, uranium and molybdenum in the form of sodium or potassium salts, and (3) inorganic and/or organic impurities, said process comprising the steps of:
Dependencies are inferred from the claim text.