During pyrite activation, metal ions are precipitated or adsorbed on the mineral surface to create suitable sites for the adsorption of the collector [10,11]. In the selective flotation of sphalerite, the undesired activation of pyrite will reduce the difference in flotation performance between sphalerite and pyrite, and cause a decrease in the ...

Pyrite oxidation kinetics are limited by the rate of reaction at the pyrite surface, with an activation energy of 33.2 kJ/mol (7.9 kcal/mol) with respect to dissolved oxygen concentration, or 41.7 ...

The copper activation of pyrite during regrinding was also studied. It was found, that the mild steel grinding media is more beneficial to copper activation than stainless steel media ...

The behavior of C1 could be trochemical behavior of CPE-pyrite mineral with high purity associated with an activation of the mineral surface due to the (98.8% pyrite) was determined and later the CPE-arsenopyrite accumulation of oxidized products on the electrode. mineral (content of 86.95% arsenopyrite, 11.84% pyrite) oxida- Figure 4 shows SEM ...

The activation of pyrite is achieved by the formation of CuS-like species on pyrite surface, which improves the surface hydrophobicity of pyrite. Weisener has suggested that activation of pyrite with CuSO 4 follows a single fast step involving Cu(II) adsorption onto the reactive sulfur sites only on the surface with no migration into the bulk ...

Acidithiobacillus ferrooxidans has been shown to be a good depressant of pyrite in freshwater and seawater flotation. However, the effect of these bacteria over copper-activated pyrite has not been studied. At the industrial scale, the activation of pyrite with copper is a common process that occurs because Cu2+ ions, released from other minerals, react with pyrite.

12%Pyrite depression in the flotation of copper ores is difficult due to the activation of Cu 2+ ions on pyrite surface. In this study, the radical chain reaction involving the redox cycling of Cu(I/II) induced by sodium metabisulphite (MBS) was exploited to selectively depress the flotation of copper-activated pyrite at pH 8.0.

Pyrite depression in the flotation of copper ores is difficult due to the activation of Cu 2+ ions on pyrite surface. In this study, the radical chain reaction involving the redox cycling of Cu(I/II) induced by sodium metabisulphite (MBS) was exploited to selectively depress the flotation of copper-activated pyrite at pH 8.0.

The activation of arsenopyrite and pyrite by cupric ions is caused by the formation of the same compound CuS on their surfaces. In strong alkaline media» the adsorbed cupric ions may stabilize the surface active sites on arsenopyrite» so that the enough and sufficient surface metal-surplus states are …

Simultaneously, the amount of adsorbed Cu(I) increases until the same Cu(I) level is reached as in acidic media. After subsequent immersion in ethyl xanthate solution of pH 6–9, both Cu(I) and Cu(II) ions adsorbed on pyrite are found to form Cu(I) ethyl xanthate in accordance with previously published infrared spectroscopic and microflotation ...

The activation process itself is the main aspect that sets active glass media apart from standard glass media. Activation produces its bio-resistance and it's highly efficient filtering capabilities. In terms of raw materials, African Pegmatite uses only green and brown recycled glass, sourced nearby to minimise carbon emissions and volumes ...

Grinding media affects pyrite activation by Cu 2+ in a different pattern. Although mild steel medium produced a higher amount of iron oxidation species than 30% chromium medium, a higher pyrite recovery was observed with mild steel medium in the presence of Cu 2+. This phenomenon may also be explained by the electrostatic interaction between ...

Grinding media have significant influence on the flotation of chalcopyrite and pyrite. This effect is mainly related to the change in the surface properties of chalcopyrite and pyrite. This paper investigates the influence of steel ball and nano-ceramic ball grinding on the floatability of chalcopyrite and pyrite. Flotation results, as well-scanning electron microscopy (SEM), X-ray ...

Electrochemical Control of Pyrite-Activation by Copper 7.1. Abstract Copper activation of polished and in situ fractured pyrite electrodes has been studied using voltammetric techniques in near neutral and acid solutions. For these studies, the pyrite electrodes were activated for fixed time periods in CuSO 4, rinsed, and inserted in a pH 4.6 ...

Peng et al (2010b) also found that mild steel media were more beneficial to the copper activation of pyrite than 30% chromium media, and it was observed that the new copper sulphide phase, formed ...