Hoechst Aktiengesellschaft

Hans-Joachim Morawietz

Kurt Bauer

Werner Ritschel

Johann F Hanauer

Erich Hoffman

A process for selective flotation of phosphate minerals, wherein a compound of the formula 1a or 1b ##STR1## in which R.sup.1 is branched or unbranched C.sub.8 -C.sub.24 -alkenyl, R.sup.2 is branched or unbranched C.sub.1 -C.sub.4 -alkyl and M is hydrogen, ammonium, triethanolammonium, an alkali metal atom or an alkaline earth metal atom, is added as a collecting agent to the flotation suspension.

Process for selective flotation of phosphorus minerals

3-Alkoxypropylenimino-bis-(methylene phosphonic acids) of the formula ##STR1## wherein R is straight-chain or branched alkyl or alkenyl each having from 2 to 20, preferably 2 to 10, carbon atoms, aryl, preferably phenyl or aralkyl, preferably benzyl, and X is hydrogen, an alkali metal, alkaline earth metal, ammonium, alkylammonium or polyalkylenepolyammonium ion, preferably a sodium, potassium or ammonium ion, a process for their manufacture and their use as collector in the flotation of non-sulfidic ores.

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Kelkheim, Germany

Hans-Joachim Morawietz