ISSN 2594-357X
22° Simpósio de Mineração — vol. 22, num.22 (2023)
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Abstract
The flotation has been successfully applied to process the iron ore for the particle size range between 10 and 150 µm. The presence of the slimes are harmful on the reverse flotation of quartz, so they are prior removed by hydrocyclones. The main effects of the presence of slimes on the flotation are related to the increase on reagents consumption, the stability of the froth and decrease on the selectivity. The lower flotability of coarse quartz particles +74 µm combined with the presence of slimes, even in small quantities, drastically affect the flotation response. This paper shows a study of characterization of typical iron ore slimes and alternatives of concentration using column flotation with collector amide-amine without depressor and pH 8.5, vertical pulsation high magnetic separation and no traditional methods as acid leaching with Fe-oxides recovery by pyrohydrolysis. The main characteristics of the slimes from the Iron Ore Quadrangle in Brasil are the presence of almost 70% of Fe-oxides (hematite and goethite), 25 % of quartz 4% of kaolinite as the main silicate minerals. Furthermore, more than 80% of the hematite and the kaolinite are below 20 µm, about 20% of the hematite is associated with 14% of quartz and 6% of kaolinite, where these aluminium-silicates appear as dispersed particles smaller than 2 μm. The affinity between the ultrafine kaolinite of the slimes with the corn starch is harmful to the reverse flotation of quartz. The presence of pure kaolinite can also totally inhibit the flotability of pure quartz even with high dosages of eterhamine. Column flotation using no traditional collector named amide-amine without depressor and pH 8.5 followed by vertical pulsation high gradient magnetic separator (VPHGMS) enabled almost 70% Fe recovery and ultrafine pellet feed with 66%Fe. Chloride acid leaching with pyrohydrolysis for the column flotation and VPHGMS tailings increased Fe recovery to 98% with slight increase of Al2O3 and P for the final concentrate.
The flotation has been successfully applied to process the iron ore for the particle size range between 10 and 150 µm. The presence of the slimes are harmful on the reverse flotation of quartz, so they are prior removed by hydrocyclones. The main effects of the presence of slimes on the flotation are related to the increase on reagents consumption, the stability of the froth and decrease on the selectivity. The lower flotability of coarse quartz particles +74 µm combined with the presence of slimes, even in small quantities, drastically affect the flotation response. This paper shows a study of characterization of typical iron ore slimes and alternatives of concentration using column flotation with collector amide-amine without depressor and pH 8.5, vertical pulsation high magnetic separation and no traditional methods as acid leaching with Fe-oxides recovery by pyrohydrolysis. The main characteristics of the slimes from the Iron Ore Quadrangle in Brasil are the presence of almost 70% of Fe-oxides (hematite and goethite), 25 % of quartz 4% of kaolinite as the main silicate minerals. Furthermore, more than 80% of the hematite and the kaolinite are below 20 µm, about 20% of the hematite is associated with 14% of quartz and 6% of kaolinite, where these aluminium-silicates appear as dispersed particles smaller than 2 μm. The affinity between the ultrafine kaolinite of the slimes with the corn starch is harmful to the reverse flotation of quartz. The presence of pure kaolinite can also totally inhibit the flotability of pure quartz even with high dosages of eterhamine. Column flotation using no traditional collector named amide-amine without depressor and pH 8.5 followed by vertical pulsation high gradient magnetic separator (VPHGMS) enabled almost 70% Fe recovery and ultrafine pellet feed with 66%Fe. Chloride acid leaching with pyrohydrolysis for the column flotation and VPHGMS tailings increased Fe recovery to 98% with slight increase of Al2O3 and P for the final concentrate.
Keywords
Iron ore slimes, Flotation, Magnetic separation, Leaching
Iron ore slimes, Flotation, Magnetic separation, Leaching
How to refer
Lima, Neymayer Pereira;
Silva, Klaydison Carlaile;
Segato, Maurício Curi.
IRON ORE SLIMES: CHARACTERIZATION AND ALTERNATIVES OF CONCENTRATION
,
p. 260-269.
In: 22° Simpósio de Mineração,
São Paulo,
2023.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-39906
