| abstract |
Process for purifying solutions containing sodium or potassium carbonate, sulfate, hydroxide or hydrogen carbonate, as well as mainly, at least one of the metals belonging to the group consisting of vanadium, uranium or molybdenum under the form of sodium or potassium salts, and mineral and / or organic impurities, according to which the abovementioned solutions are completely or partially caustified by the addition of an adequate quantity of lime, the first precipitate containing essentially calcium carbonate is separated and concentrates the separated liquor by evaporation until a hydroxide content at most equal to 50% is obtained, in order to obtain a second precipitate essentially consisting of sodium or potassium sulphate, then, after separation of this one collects a liquor rich in hydroxide.n n n This process is more particularly suited to the treatment of liquors resulting from the alkaline attack on vanadiferous and uraniferous ores. |