| abstract |
Abstract A process for the recovery of minerals from non-sulfidic ores by flotation Salts of esterification products of maleic acid with oligoglycerol partial esters corresponding to formula (I) (I) in which R1, R2, R3 and R4 independently of one another represent hydrogen, a saturated aliphatic acyl radical contain-ing 8 to 18 carbon atoms or a CO-CH=CH-COOX- group, X is an alkali metal or ammonium and n is 0 or a number of 1 to 18, with the proviso that at least one of the substituents R1 to R4 is an acyl radical and at least one is a CO-CH=CH-COOX group, optionally in admixture with other anionic or nonionic surfactants, are suitable as collectors for the flotation of non-sulfidic ores, more particularly apatite. |