Study On The Floc Flotation Behavior And Its Mechanism Of Jamesonite And Marmatite Fines

In this paper, flotation tests of single mineral were carried out to study the flotation behaviors of jamesonite and marmatite fines induced by ammonium dibutyl dithiophosphate and sodium butyl xanthate. The mechanisms of mineral-reagent interaction and the reinforcement mechanism of non-polar oil on the floc flotation of fine minerals also have been investigated by laser particle size analysis, microscope observation, electrophoretic light scattering measurement, contact angle measurement, adsorption determination and infrared spectroscopy. The researches concerning flotation of jamesonite and marmatite were mainly on coarse minerals, but rarely on fine minerals. Therefor this thesis has certain innovation and academic value. Main conclusions were as follows:(1) The hydrophobic floc flotation induced by ammonium dibutyl dithiophosphate and sodium butyl xanthate was very effective on jamesonite and marmatite fines in aqueous suspensions. The adsorption of reagent on mineral surface led to the increase of hydrophobicity of mineral surface, thus intensifying the hydrophobic flocculation and floatability of mineral. Experimental results show that the floatability of jamesonite and marmatite fines was proportional to the increase of granularity and the adsorption capacity of reagents, as well as influenced by the stirring speed, flotation peed, temperature and other factors. Zeta potential measurement, contact angle measurement and the calculation of interaction energy indicated that the gather of the same phase of marmatite particles belongs to hydrophobic floccules.(2) The floc flotation response of jamesonite and marmatite fines was markedly enhanced by the addition of a small amount of non-polar oil (kerosene and diesel). The strengthening mechanism was mainly attributed to the increase of apparent granularity of fine mineral and the increase of surface hydrophobicity as the formation of oil films on mineral surface.(3) The results of infrared spectroscopy indicate that adsorptions of ammonium dibutyl dithiophosphate and sodium butyl xanthate onto jamesonite and marmatite were all of chemical adsorption. The adsorption product of sodium butyl xanthate onto jamesonite was butyl xanthate lead. There were two products of butyl xanthate zinc and ferrous butyl xanthate formed on marmatite surface. The adsorption products of ammonium dibutyl dithiophosphate onto jamesonite and marmatite surfaces were lead dibutyl dithiophosphate and zinc dibutyl dithiophosphate, respectively. The activation of Cu2+on the flotation of minerals induced by ammonium dibutyl dithiophosphate was mainly because of the formation of copper dibutyl dithiophosphate. The FTIR absorption peaks of the two minerals induced by ammonium dibutyl dithiophosphate, especially of jamesonite were intensified as the addition of kerosene, indicating that kerosene can adsorb on mineral surfaces and intensify the adsorption of collectors onto mineral surfaces.