METHOD FOR RECOVERING MOLYBDATE OR TUNGSTEN FROM AQUEOUS SOLUTIONS BY ADSORPTION

摘要

1. The method of recovery of molybdate or tungstate from an aqueous solution, which consists in the fact that! a) the molybdate or tungstate-containing aqueous solution is brought into contact with a water-insoluble, cationized inorganic carrier at a pH value from 2 to 6 to obtain a carrier saturated with molybdate or tungstate and an aqueous solution depleted in molybdate or tungstate,! b) the carrier saturated with molybdate or tungstate is separated from the aqueous solution depleted in molybdate or tungstate,! c) a carrier saturated with molybdate or tungstate is brought into contact with an aqueous solution at a pH in the range of 6 to 14 to obtain a carrier depleted in molybdate or tungstate and an aqueous solution saturated with molybdate or tungstate, and! d) the carrier depleted in molybdate or tungstate is separated from the aqueous solution saturated with molybdate or tungstate,! wherein the cationized inorganic carrier is bentonite, hectorite or attapulgite ion-exchanged with tetraalkylammonium ions or quaternized esters of fatty acids and alkanolamines. ! 2. The method according to claim 1, characterized in that stage a) is carried out at a pH in the range from 3 to 5, preferably from 3.5 to 4.! 3. The method according to claim 1, characterized in that stage c) is carried out at a pH in the range from 8 to 12, preferably from 9 to 11.! 4. The method according to claim 1, characterized in that as a cationized inorganic carrier, bentonite is used, subjected to ion exchange with tetraalkylammonium ions or quaternized esters of fatty acids and alkanolamines. ! 5. The method according to claim 1, characterized in that the cation