EFEITO DOS ÍONS Ca2+ E Mg2+ NA FLOTAÇÃO CATIÔNICA REVERSA DE MINÉRIO DE FERRO ITABIRÍTICO

The adsorption mechanisms of the starch on the hematite surface are: hydrogen bonds, hydrophobic interactions between the mineral surface and the hydrophobic portion of the polysaccharide, and the formation of complexes with Fe (chemisorption) on the mineral surface (Khosla et al., 1984, Pinto et al...

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Published inHolos (Natal, RN) Vol. 37; no. 3; pp. 1 - 11
Main Authors Da Cruz, D G, Gonçalves, P S M, Lelis, D F, Lima, R M F
Format Journal Article
LanguageEnglish
Published Natal Instituto Federal de Educacao Ciencia e Tecnologia do Rio Grande do Norte 01.01.2021
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Summary:The adsorption mechanisms of the starch on the hematite surface are: hydrogen bonds, hydrophobic interactions between the mineral surface and the hydrophobic portion of the polysaccharide, and the formation of complexes with Fe (chemisorption) on the mineral surface (Khosla et al., 1984, Pinto et al., 1992; Peres & Correa, 1996; Dziechciarek et al., 2002, Pavilovic & Brandao, 2003; Filipov et al., 2014; Shrimali & Miller, 2015; Aguiar et al., 2017; Veloso et al., 2018). [...]the adsorbed starch on the hematite surface prevents the adsorption of the amine species on the mineral surface, which remains hydrophilic. The depressant effect of polyvalent cations (Ca2+, Al3+, Fe3+, Mn2+, Mg2+) and their hydrolysis products on the quartz flotation is related to these electrostatic attraction by the negative sites present on the mineral surface, preventing the adsorption of the amine (competition occurs between the cationic species from hydrolysis of polyvalent positive ions and aminium by the quartz surface), whose main mechanism occurs by electrostatic attraction between the aminium cations and the negative sites, besides the formation of hydrogen bonds between the NH2 groups with SiOH on the quartz surface, and precipitation of the reagent at the solid/liquid interface (Scott & Smith, 1993; Vidyadhar et al., 2008; Pinheiro et al., 2010, Pinheiro et al., 2012, Liu et al., 2013, Boujounoui et al., 2015; Cruz & Lima, 2015; Lelis et al., 2016, Nakhaei & Irannajad, 2017; Mhonde et al., 2017; Pattanaik & Venugopal, 2018; Tripathy, 2018). [...]the concentrations of Ca2+ and Mg2+, in the industrial recycled waters of process, higher than 15 mg/L (Houot, 1983), coming from the addition of reagents such as lime for pH control of pulps for pipeline transport or from the dissolution of carbonates present in the gangue, should be controlled to levels that do not affect the performance of the cationic flotation of iron ore containing quartz and carbonates (Mamede et al., 2016; Carvalho & Peres, 2004). The possibility of using EDTA as a complexing agent of these cations was evaluated, aiming at the reestablishment of the selective separation between quartz and iron minerals. 2MATERIALS AND METHODS 2.1 Ore and reagents An itabiritic iron ore sample collected in the industrial flotation circuit of a mine located in Quadrilátero Ferrífero-Brazil was used. The minerals identified in the X-ray diffractogram using the total powder method collected by the Panalytical Expert3 X-ray diffractometer (XCu = 1.54 Å), operating at 45 kV and current of 40 mA, were: quartz, hematite and goethite. [...]the LOI (loss of ignition) and AhO3, contents are probably related to goethite aluminous, which is very common in Algeria's ore reserves (Santos & Brandao, 2005; Magalhaes et al., 2007).
ISSN:1518-1634
1807-1600
DOI:10.15628/holos.2021.9000