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Also noting a high level of aeration or oxidation potential for improved pyrrhotite flotation (Khan and Kelebek, 2004; Alekseeva, 1965), it is expected that the oxide or hydroxide product layer from pyrrhotite oxidation may have a high electric resistance (average resistivity for natural pyrrhotite: 1 · 10 5 X/m, average resistivity for ...
Pyrrhotite is one of the most abundant sulphide gangue minerals in base metal mining operations. It has little economic value and is a significant contributor of SO 2 emissions at the smelting stage, thus it is rejected in most concentrators, requiring a concerted effort to ensure it is well separated from valuable minerals. The mineral processing of pyrrhotite is generally understood, however ...
Separation of pyrrhotite from pentlandite is highly important in flotation practice of massive nickel sulphide ores. Flotation reactivity of these minerals was studied using cyclic voltammetry and rest potential measurements, which included dissolved oxygen concentration and butyl xanthate addition as the main parameters at a solution pH of 9.2. Under the experimental conditions …
On the other hand, preferential oxidation of pyrrhotite may lead to a selectivity increase in flotation. Such a behaviour has been noted in the flotation of a pyrrhotite-rich process stream. The results have been discussed in the light of fundamenLal electrochemical interactions involving pentlandite, chalcopyrite, pyrrhOlite, pyrite and grinding
However, when sphalerite or marmatite is associated with pyrite and pyrrhotite, the recovery of Cu-activated sphalerite or marmatite by flotation is vulnerable to the disturbance of associated pyrite and pyrrhotite, which can be attributed to the following possible reasons: (1) During the process of copper-activation for sphalerite or marmatite, lime-depressed pyrite and …
Introduction Different sulphide ores respond differently in the prospect of copper activation to thiols for froth flotation. With the BCL Selebi-Phikwe ore body, pentlandite–pyrrhotite–chalcopyrite co-occur and there is the constraint of fine pentlandite dissemination in the pyrrhotite, so that liberation is limited. In the presence of pentlandite, …
The flotation process normally adds copper sulfate as an activator which could accelerate the flotation rate of pyrrhotite. The flotation is conducted at the natural pH of the milled ore which may vary between 7.5 and 9 but it is typically closer to the higher value . However, in the practice of iron ore flotation, the loss of valuable mineral ...
DOI: 10.1016/J.MINENG.2005.02.011 Corpus ID: 98582713; A review of pyrrhotite flotation chemistry in the processing of PGM ores @article{Miller2005ARO, title={A review of pyrrhotite flotation chemistry in the processing of PGM ores}, author={Jan D. Miller and J. Li and John C. Davidtz and Frans Vos}, journal={Minerals Engineering}, year={2005}, volume={18}, …
A review of pyrrhotite flotation chemistry in the processing of PGM ores J.D. Miller a,*,J.Lia, J.C. Davidtz b, F. Vos b a Department of Metallurgical Engineering, University of Utah, Salt Lake ...
In this paper, the importance of electrochemistry in Po and Pn flotation has been demonstrated and a comprehensive study was conducted on two different feed streams (i.e., …
Figure 5 Flotation selectivity in the separation of pentlandite from pyrrhotite using sulfur dioxide and diethylenetriamine with sodium isobutyl xanthate (pH+9.2, 25 g t 1 Dow froth!250). (Reprinted with permissionfrom the CanadianInstitute of Mining, Metallurgy and Petroleum.) Figure 6 Flotation results obtained with Clarabelle ore from
The rejection of pyrrhotite and pyrite has become a long-standing problem in the copper ore industry. This paper describes the first successful depression and adsorption mechanism of a novel and non-hazardous reagent, polyglutamic acid (PGA), on pyrrhotite in the selective flotation of chalcopyrite with xanthate as the collector, making use of various …
A series of batch flotation tests was performed on chalcopyrite-quartzite, on pyrrhotite-quartzite and on chahcopyrite-pyrrhotite-quartzite mixtures. Pulp potential measurements in the flotation tests with single sulfide minerals indicated that each sulfide mineral had its own optimal potential range for flotation. When these results were used to select the …
The iron sulfide mineral, pyrrhotite (Fe(1−x)S), has long been known to be more difficult to recover by flotation from alkaline slurries than many other base metal sulfide minerals. This paper summarizes the results of an electrochemical study of the surface reactions that occur during the flotation of nickeliferous pyrrhotite in the recovery of nickel and the platinum group metals. …
The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS) analysis. The flotation results …
The products from pyrrhotite oxidation cover the pyrrhotite particles, rendering the particle surface hydrophilic and causing a lower flotation recovery of pyrrhotite under most …
The galvanic interaction between chalcopyrite and monoclinic pyrrhotite and its effect on flotation separation were studied using monomineral flotation tests, adsorption capacity tests, X-ray photoelectron spectroscopy (XPS) characterization, and scanning electron microscopy (SEM) test. These results showed that the interaction promoted the reduction of …
The chemistry of pyrrhotite flotation using xanthate collectors is reviewed with respect to the processing of PGM ores and the recent results from captive bubble contact angle …
At the pH values ranging from 6 to 9, monoclinic pyrrhotite can be floated well, and the flotation recovery is higher than 90%. Monoclinic and hexagonal pyrrhotites are more …
In the present paper, a comprehensive review is conducted to discuss the influence of crystal structures on the natural floatability, mineral-reagent interaction, surface oxidation and flotation …
The stability of Fe 2+ in pyrrhotite flotation was revealed by combining microflotation tests and adsorption experiments, providing a theoretical basis for the efficient …
Electronic structures of monoclinic and hexagonal pyrrhotite were studied using density functional theory method, together with their flotation behavior. The main contribution of monoclinic pyrrhotite is mainly from Fe 3d, while that of hexagonal pyrrhotite is from Fe 3d, Fe 3p and S 3s. The hexagonal pyrrhotite is more reactive than monoclinic pyrrhotite because of …
Thus, the impact of concentrator process water quality on the behavior of pyrrhotite needs to be determined. In this study, synthetic process water at various ionic strengths was investigated against various CMC dosages to understand the behavior of pyrrhotite during the flotation of a Cu–Ni–PGM bearing Merensky ore in a batch flotation cell.
Hexagonal pyrrhotite follows conventional flotation recovery by particle size (highest in intermediate fractions; 10–100 μm) while monoclinic pyrrhotite is mainly recovered in the finest fractions (<10 μm) where entrainment effects have been mitigated (Lawson et al., 2014, Multani and Waters, 2017). This trend has been observed in many ...
In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under conventional flotation conditions (open to air and pH 9.0).Thermodynamically pyrrhotite ...
Pyrrhotite flotation and its selectivity against pentlandite in the beneficiation of nickeliferous ores: An electrochemistry perspective. H. Manouchehri. Chemistry. 2014; Pyrrhotite (Po) is one of the most abundant sulfide minerals in …
The floatability of different crystalline structures of pyrrhotite (monoclinic and hexagonal) was studied. It is shown that the floatability of monoclinic and hexagonal has obvious difference, and that the flotation recovery of monoclinic pyrrhotite is larger than that of hexagonal pyrrhotite using different collectors. When butyl dithiophosphate is used as the collector, the …
The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS ...
With the continuous development of mineral resources to high altitude areas, the study of sulfide ore flotation in unconventional systems has been emphasized. There is a consensus that moderate oxidation of sulfide ore is beneficial to flotation, but the specific suitable dissolved oxygen value is inconclusive, and there are few studies on sulfide ore flotation under low …
The chemistry of pyrrhotite flotation using xanthate collectors is reviewed with respect to the processing of PGM ores and the recent results from captive bubble contact angle measurements at the University of Utah are presented. In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under ...
