| abstract |
The invention relates to a method for extracting anions based on metals of t he V group to the VII group of the periodic table from the aqueous solution thereof. To this end, compounds or general formula (I) are used as an extracting agent, whereby a maximum of two of the R1, R2, R3 and R4 represen t hydrogen atoms, and the remaining alkyl groups or amino alkyl groups which a re optionally branched and which are the same or different represent, on averag e, at least 5 carbon atoms. The inventive method is especially suited for extracting tungsten from molybdenum and from solutions containing tungsten. An additionally preferred method is used for the extractive separation of cobal t and nickel from aqueous solutions containing cobalt ions and nickel ions.</S DOAB> |