Consequently, gold flotation recovery requires a focus on floating the associated base metals (predominantly lead, copper) and often pyrite minerals. While lime is often used in base sulphide mineral flotation, because excess lime also tends to depress gold flotation, a balance must be maintained between good base metal metallurgy and gold ...

Abstract. Native gold and electrum are naturally-occurring alloys containing gold and silver and a little copper. They are the most common and important forms of gold in ores. Their recovery by gravity concentration, cyanidation, or flotation from ores, typically containing 0.1–20 g/t Au is of great commercial importance.

The fundamental understanding of the improvement in selectivity with the addition of MTP in the flotation of ele-mental gold from pyrite is limited and is the subject of this paper. In this regard ...

It was found that high gold recovery (>90%) can be achieved by the selective flotation of pyrite and sphalerite. However, the sphalerite flotation results showed that sphalerite could not be separated from pyrite with a high selectivity (selectivity index∼1), because of insufficient depression of pyrite (with high alkaline medium and/or …

The flotation of pyrite is pH-dependent, and pH 5 is a boundary value where pyrite has a naturally hydrophobic surface with both negative and positive hydroxy iron groups (Fe ... Flotation of gold ores. Handbook of Flotation Reagents: Chemistry, Theory and Practice, Elsevier, Amsterdam (2010), pp. 1-17. View PDF View article View in …

Optimisation of gold recovery by selective gold flotation for copper-gold-pyrite ores. February 2001. Minerals Engineering 14 (2):227-241. DOI: 10.1016/S0892 …

Read this article. In this study, the flotation behaviors of gold and gold-associated sulfide minerals (pyrite and sphalerite) in a polymetallic sulfide gold ore …

Analysis of the Selective Flotation of Elemental Gold from Pyrite Using Diisobutyl Monothiophosphate. October 2022. Minerals 12 (10):1310. DOI: 10.3390/min12101310. License. CC BY 4.0....

1. also for beneficiation and separation of difficult-to-treat (refractory) gold ores. Flotation is also the best method for recovery of gold from base metal ores and gold-containing …

The pyrite rougher concentrate was obtained by two-stage copper and pyrite rougher flotation using the conditions in Table 1 and reported in Agorhom et al. (2013). However, in the present studies, the focus is to examine flotation depression of pyrite after regrinding the combined pyrite rougher concentrates using aeration and DETA (Fig. 1).

The gold ore tested comprised of predominantly gold bearing pyrite from Western Australia. The ore was first crushed to − 2.36 mm in size prior to the grinding. After the crushing, the ore was dry ground to the particle size of 80% passing of 150 μm using a laboratory scale rod mill.

It was found that increasing pH from 9.0 to 10.5 and then to 11.5 progressively depressed pyrite in chalcopyrite flotation with 5% pyrite, but a different phenomenon occurred in the flotation with 25% pyrite. In the flotation with 25% pyrite, increasing pH from 9.0 to 10.5 promoted pyrite flotation unexpectedly, while increasing pH from 10.5 …

On the other hand, pyrite is a common host for valuable metals, such as gold. It is also increasingly being seen as a source of other "critical" metals such as cobalt. ... The pyrite flotation results clearly demonstrate that different flotation domains exhibit significantly different pyrite recoveries. Overall, these values are similar to ...

An investigation into the effects of various flotation parameters on the flotation behavior of pyrite, gold and uranium contained in the Witatersrand Type ores and their practical exploitation, International Conference on Gold, 1986, 505-525. Ekmekci, Z. and Demirel, H., Electrochemical behaviour and collectorless flotation of pyrite.

The pyritic copper–gold ore used in this study was obtained from a copper–gold mine in Asia. The pyrite rougher concentrate was obtained by two-stage copper and pyrite rougher flotation using the conditions in Table 1 and reported in Agorhom et al. (2013).However, in the present studies, the focus is to examine flotation …

Flotation of Pyrite. Table of Contents. This paper is a record of the first of a series of tests on sulfide minerals to be made by the metallurgical department of the University of California. The purpose of …

Flotation recovery of pyrite and arsenopyrite at pH 6.4 and 120 g/t: A) DTP and B) PAX as a function of time. Schematic representation of the effect of collector type and H2O2 on depression of ...

A selective collector in the flotation of elemental gold from sulfide minerals improves both gold grade and recovery. The typical collector, such as DTP, floats gold and pyrite simultaneously. In …

Kinetics of semi-batch flotation behavior of a gold ore from North-Western Quebec, Canada was investigated with respect to fineness of grind (P80). The gold was mostly associated with pyrite in ...

The preferential concentration of valuable metals such as gold in arsenopyrite in comparison to pyrite drives current research interest, despite challenges associated with separating arsenopyrite from pyrite during froth flotation (Asamoah et al., 2019b, Beattie and Duteroue, 1992, McCarthy et al., 2018, Zhang et al., 2016).

Flotation circuits in commercial gold concentrators are described, along with modern plant practice for various ore types, including refractory gold, arsenopyrite, pyrrhotite, pyrite, telluride ...

Gold often coexists with pyrite as micron and submicron-inclusions and pyrite is therefore floated to maximize gold recovery in gold processing plants. In practice, different types of grinding media and a great range of pH and collector concentrations are used for pyrite flotation without scientific guidance.

The gold ore used in this work was obtained from Kanowna Belle gold mine (Kalgoorlie, Western Australia). This plant has a flotation circuit to recover gold-bearing pyrite and a gravity circuit to recover free gold. In other words, the flotation feed contained gold locked in pyrite and free gold. 2. Materials and methods2.1. Ore sample

Flotation preconcentration of gold-bearing sulfides (pyrite and arsenian pyrite) from many Carlin-type refractory gold deposits are challenging, with low recovery …

Gold and pyrite separation by flotation could possibly be achieved in this system due to the significant differences in hydropho- bicity found between gold and pyrite (Figs. 4 and 5). Fig. 6 shows the results of measurements of the electrophoretic mobility of pyrite as a function of pH for different conditions of superficial oxidation, in the ...

Fig. 2 shows that as pH increased from 9.0 to 10.5 and then to 11.5, the pyrite recovery obtained from the flotation of the ore with 5 % pyrite decreased steadily from 94.5 to 40.6 % and then to 10.3 %. Hence, a direct link between the decreased pyrite recovery in Fig. 2 and the increased Cu grade in Fig. 1 when pH increased could be drawn. The …

Two-stage flotation (copper and pyrite rougher stages) at a p80 of 70 µm indicated that high gold (95.2%) and copper (97.4%) recovery can be achieved, but the levels of pyrite in the concentrate ...

The flotation recovery of arsenopyrite far exceeded that of pyrite with the addition of 50, 150 and 300 mg/l CuSO 4 concentration, in conformity with flotation behaviour reported in single mineral study (Forson et al., 2021a). As discussed in the preceding section, a change of the nature of IPETC interaction at high pH (>11) may be …

The reason is that pyrite is the most common gold-bearing mineral and hence it is recovered by flotation in numerous gold mining operations (Albijanic et al., 2015a;Rabieh et al., 2016; Rabieh et ...

These particles may be separated from the oxides of iron by washing, and the use of nitric acid, followed by panning, is frequently resorted to in order to detect gold in pyrites. Moreover, although usually invisible, gold can sometimes be seen in unroasted pyrites. As long ago as the year 1874, Richard Daintree and Latta found specimens of ...

Since this is a pyrite-dominant ore, the flotation recoveries of Fe and S presented in Fig. 1 are indicative of the flotation performance of pyrite. It can be seen that the collector-less flotation of pyrite was poor in the first 3 min flotation without the addition of 3418A prior to flotation with only 2.1% Fe recovery and 2.7% S recovery.Pyrite did …