True flotation <i>versus</i> entrainment in reverse cationic flotation for the concentration of iron ore at industrial scale

Nykänen, Virginia P. S.; Braga, André Soares; Pinto, T.C. Souza; Matai, Patrícia Helena Lara dos Santos; Lima, Neymayer Pereira; Filho, Laurindo de Salles Leal; Monte, Marisa Bezerra de Mello

doi:10.1080/08827508.2018.1514298

Cited by 12 publications

(1 citation statement)

References 26 publications

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“…Nykänena et al [21] studied the loss of iron-bearing minerals to the froth in two industrial mechanical flotation circuits (Conceição Itabiritos II and Pico). There are two mechanisms for this iron mineral loss, especially in the finer fractions (−44 µm): hydrodynamic dragging and true flotation and, according to the authors, at Conceição Itabiritos II, concerning the particles size below 44 µm, 65.4% of the iron in this fraction was carried to the froth due to due inefficiency in the depression process.…”

Section: Developments Of Collectors Regarding the Brazilian Iron Ores Slimes Characteristicsmentioning

confidence: 99%

Iron Ore Slimes Flotation Tests Using Column and Amidoamine Collector without Depressant

et al. 2021

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This work describes the concentration of iron ore slimes on a pilot scale by using a 500-mm diameter flotation column and a novel collector, which renders the use of a depressant unnecessary. The pilot column was operated in series with the industrial plant Vargem Grande 2 (Iron Quadrangle, Brazil) receiving, as feed, part of the underflow from the desliming thickener. These pilot tests represented only the rougher stage of a flotation circuit. The novel collector used was an amidoamine (average collector dosage of 160 g/t), and the tests were carried out in the absence of starch, at pH 10.5 and with bubbles/microbubbles generated by cavitation tube. It was possible to achieve a concentrate, by reverse flotation, with an average iron content of 53% and an average metallurgical recovery of 91.5% The recovery of the silica in the froth was 53.1% in average for one stage of flotation. The high variability of the slime characteristics rendered difficult the stabilization of the SiO2 recovery; however, the applicability of the amidoamine collector was proven. In an industrial scale circuit, the use of online analyzers for Fe and SiO2 content and the adoption of control logics based on the adjustment of parameters such as reagents dosage and washing water flow rate adjustment should contribute to the optimization of the results obtained in the pilot scale tests. Further studies adding a cleaner concentration stage should be performed.

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Section: Developments Of Collectors Regarding the Brazilian Iron Ores Slimes Characteristicsmentioning

confidence: 99%