MN(II) RECOVERY FROM AQUEOUS SYSTEMS BY FLOTATION

Various aqueous systems produced by different technologies can contain Mn(II) in the concentration range of 50 divided by 1000 mg x l(-1), w hich represents a pollution source but also can be used for the separa tion-recovery of useful compounds. The present paper presents the resu lts of the researches concerning Mn(II) recovery from ''model'' and re al aqueous systems by the precipitate flotation method, dissolved air flotation (DAF) variant, with izoalkylcarboxillic acid as collector. T he following influencing factors were studied: pH, collector concentra tion, metallic ion concentration, necessary gas flow and foam processi ng with Mn(II) recovery as oxide. The separation mechanism by the coll ector-Mn(II) interaction at optimal conditions is also studied. Theref ore, a correlation of chemical analysis results with electronic and vi brational spectra and thermal analysis is made. The results of the exp erimental data plead for the recovery separation of Mn(II) from aqueou s systems and its recovery as oxide after thermal decomposition of the species contained in the foam. (C) 1998 Elsevier Science Ltd. All rig hts reserved.