| abstract |
The invention relates to a process for the selective flotation of phosphorus minerals, in which process the flotation collectors used are one or more compounds of the formula 1a and/or 1b (* CHEMICAL STRUCTURE *) (1a) (* CHEMICAL STRUCTURE *) (1b) wherein R1 is a branched or straight-chain C8-C24-, in particular C8-C18-alkenyl, R2 is a branched, straight-chain or cyclic alkyl having 5 and/or 6 carbon atoms and M is hydrogen, an alkali metal or alkaline earth metal, ammonium or NR3R4R5 where R3, R4 and R5 independently of one another are hydrogen, C1-C20-alkyl or C1-C20-hydroxyalkyl, optionally as a mixture or combination with co-collectors. |