pyrite flotation

Coadsorption Phenomena in the Separation of Pyrite from ...

The reverse flotation of pyrite from coal was studied to determine surface chemical aspects of this system. Included in the research was determination of the effect of dextrin on the adsorption of xanthate by pyrite, measurement of rest (mixed) potentials for crystal- and coal-pyrite electrodes and evaluation of the bench scale flotation response with respect to the understanding of …

Effects of Pyrite Texture on Flotation Performance of ...

Pyrite particles, having framboidal/altered texture, are known to significantly affect pulp chemistry and adversely affect flotation performance. Therefore, the main objectives of this study were to demonstrate influence of pyrite mineralogy on the flotation of copper (sulphidic) ores and develop alternative conditions to improve the performance.

FROTH FLOTATION : RECENT TRENDS Flotation of Sulphide …

various practical aspects of sulphide ore flotation technologies. DISTINGUISHED FEATURES OF SULPHIDE MINERALS Some of the important sulphide minerals are: Galena (PbS), Sphalerite (ZnS), Chalcocite (Cu2S), Covelite (CuS), Chalcopyrite (CuFeS2), Pyrite (FeS2), Molybdenite (MoS) etc. Distinguished features of these minerals are:- 1.

1 Froth Flotation – Fundamental Principles

1 Froth Flotation – Fundamental Principles Froth flotation is a highly versatile method for physically separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry. The particles with attached air …

Role of dixanthogen on pyrite flotation: solubility ...

The xanthate adsorption mechanism on pyrite was investigated with an emphasis on solubility studies. Additionally, adsorption studies, Eh and infrared spectrophotometer measurements were performed. Pyrite floats at pH levels between 3 and 6 using ethyl and amyl xanthafes with a maximum at pH 4. The solubility of pyrite in the absence and presence of xanthate was investigated …

Pyrite Flotation Separation and Encapsulation: A ...

Pyrite flotation separation and encapsulation in tailings dams is proposed as a viable way to chemically stabilize tailings. Characterization of potential acid mine generation in tailings led to an innovative process in which acid-generating pyrite is separated by flotation from the coarse tailings and incorporated into the slime zone.

Effect of Collector Type and Blends on Mixed Pyrite and ...

high flotation rate constant for singular use of SIBX signified a more selective flotation of pyrite into the concentrate rather than an equal mass recovery of both minerals as shown in Figure 4. Figure 4 Effect of blends on selectivity of flotation 4 Conclusion The recoveries obtained with blends of SIBX and DTP demonstrated a synergistic effect.

The depression of pyrite in selective flotation by ...

Pyrite is a gangue mineral widely associated with valuable minerals. It is problematic to deal with in differential flotation because it easily reports to flotation concentrates. Pyrite may float due to natural or self-induced hydrophobicity or collector-induced hydrophobicity.

The effect of molecular assembly between collectors and ...

Through the flotation experiment of pyrite and talc artificial mixed ore, the flotation separation effect of pyrite and talc after the intermolecular assembly of the solid–liquid interface flotation agent was investigated. The artificial mixed ore flotation test was carried out in a 40 ml hanging trough flotation machine.

CiteSeerX — Pyrite flotation with xanthate under alkaline ...

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The extensive literature on sulfide flotation indicates that pyrite poorly floats under alkaline condition. Xanthate concentration has a positive effect on pyrite flotation, but above a pH of 11, pyrite seems to be strongly depressed, independently of the concentration in xanthate.

(PDF) Pyrite Flotation: A Review - researchgate.net

Pyrite Flotation: A Review. N. E. Altun and T. Güler. Muğla University, Mining Engineering Depar tment 48000 Muğla, Turkey. Ü. Akdemir. Cumhuriyet University, Mining Engineering Dep artment ...

The Adsorption of Cu Species onto Pyrite Surface and Its ...

The adsorption of Cu species onto pyrite surface and its effect on flotation were investigated by using microflotation tests, first-principle calculations, and XPS surface analysis. The results indicated that the flotation of pyrite appears to be activated with CuSO 4 only at alkaline pH, while being depressed at acidic and neutral pH.

The Flotation of Pyrite using Xanthate Collectors

The flotation properties of pyrite were found to be significantly influenced by va~iations in the pH. In acidic solutions the pyrite floatability is very high, and recoveries of 95% could be achieved using only a frother. A sharp decrease in floatability was observed in alkaline ...

Recovery of metal values from copper slags by flotation ...

The second route was flotation of the slags, roasting of the flotation tailings with pyrite and leaching. The second route was found to be suitable for the treatment of the copper slag studied. In ...

Role of Montmorillonite, Kaolinite, or Illite in Pyrite ...

Flotation tests suggested that the detrimental effect of clay minerals on the flotation of pyrite increased as follows: montmorillonite > kaolinite > illite. With the help of rheology measurements, it was found that montmorillonite significantly increased pulp viscosity, which in turn substantially reduced pyrite …

Surface characterization of molybdenite, bismuthinite, and ...

Numerous works have been performed to investigate the phenomena happening on the surface of pyrite during flotation. However, most relevant works were undertaken in extremely acid solution (pH of 0 or 1) or in the moderate alkaline solutions (pH of 8 to 10) [18], [19], [20], with few covering the common range of pH in a systemic manner.

How does flocculation / flotation work? (video) - YouTube

: The videos shows the flocculation flotation proces as described in Nijhuis 1980's info VHS tape. The flocculation flotati...

(PDF) Role of Starch and Metabisuphite on Pure Pyrite and ...

The effect of starch on pure pyrite flotation 0 0 5 10 15 20 Starch, m g/L 3.1.2. Effect of Na2S2O5 The effect of Na2S2O5 was investigated at pH 6.5 and 10. The amount of Na2S2O5 was between 34 mg/dm3 and 134 mg/dm3, and the amounts of Aerophine 3418 A …

Flotation of sphalerite and pyrite in the presence of ...

8 min of flotation of 88% in the absence and 73% in the presence of 10 mol dm. y3 3 sodium sulfite. The effect of sodium sulfite on pyrite flotation is more pronounced than on sphalerite flotation with flotation recoveries being reduced by half at a sodium sulfite concentration of 2=10 y4 mol dm 3. However, at higher sodium sulfite concentrations,

US3807557A - Flotation of pyrite from coal - Google Patents

Pyrite is removed from coal by means of a two-stage froth flotation process. In the first stage, coarse pyrite is removed as underflow in a conventional froth flotation operation. In the second stage, the froth product from the first stage is subjected to froth flotation using a coal flotation depressant and a pyrite flotation collector, thereby removing a substantial proportion of fine pyrite.

Flotation of Pyrite - 911metallurgist.com

The finer the material, the greater is the percentage of recovery; the pyrite should pass at least a 170-mesh screen in order to get efficient flotation under the conditions of the tests. Of the many factors affecting flotation, only two—the oil and the other agent used—were made variable.

[PDF] A study on the effect of active pyrite on flotation ...

Active pyrite is one of the most undesirable phenomena in the flotation of porphyry copper ores. Misreported pyrite into copper concentrates decreased the grade and recovery of copper. In this study, the effective parameters on the flotation process including grinding condition and chemical parameters were evaluated in order to decrease the active pyrite recovery by flotation.

Removal of Pyrite in Coal Flotation: Mineral Processing ...

In most operating coal-cleaning plants, a significant amount of pyrite is recovered in the froth during flotation of high-sulfur coal. Reducing the pyrite recovery first requires that the primary recovery mechanism should be identified, as different measures are required for reducing entrainment, locked-particle flotation, or true hydrophobic flotation.

Depression of Pyrite in Seawater Flotation by Guar Gum ...

The application of guar gum for pyrite depression in seawater flotation was assessed through microflotation tests, Focused Beam Reflectance Measurements (FBRM), and Particle Vision Measurements (PVM). Potassium amyl xanthate (PAX) and methyl isobutyl carbinol (MIBC) were used as collector and frother, respectively. Chemical species on the pyrite surface were characterized by …

Abstract: Metal sulfides are highly desirable owing to their semiconductor properties promoting electrochemical reactions for sulfide flotation. As the most common sulfide mineral, pyrite is found in coal and can contain a small amount of gold. The potential of electrochemical reactions for the beneficiation of pyrite makes it necessary to study its electrochemical behavior.

A study on the effect of active pyrite on flotation of ...

activated pyrite flotation. They demonstrated that the pulp oxidation potential is one of the important factors controlling the copper-activated pyrite flotation so that it can determine the different proportions of hydrophobic and hydrophilic species on the pyrite surface (He et al., 2005).

Gold-Pyrite ores - Danafloat

Natural pH is recommended for gold flotation. Alternatively using soda ash for pH adjustment can reduce gold depression. Where gold is associated with pyrite in base metal ores where iron sulphides are depressed and report to the tailings, a separate tailings pyrite flotation …

BETESCA

ESCA Analysis of Flotation Reagent BET Reaction on Coal and Pyrite Surface[J]. Chinese Journal of Engineering, 2002, 24(5): 483-487. doi: 10.13374/j.issn1001-053x.2002.05.001

ROLE OF STARCH AND METABISUPHITE ON PURE PYRITE …

Flotation recovery decreased from 43% to 4% at pH 10, and from 75% to 23.3% at pH 6.5 with 134 mg/dm3 metabisulphide addition. Decrease in recovery with metabisulphate was about 40% at pH 10 where pyrite flotation is already low due to high pH and about 50% decrease in recovery was obtained at pH 6.5. Test results

Pyrite depression in coal flotation by the addition of ...

I claim 1. A froth flotation process for reducing sulfur concentration of a coal containing pyrite comprising mixing in a flotation cell a fine particle size fraction of said coal with an aqueous media and a flotation gas in the presence of a soluble salt of a metal cation and an anion capable of forming sulfite in an aqueous media whereby the fine coal particles are removed from the cell in ...

Effects of Pyrite Texture on Flotation Performance of ...

2 Pyrite particles, having framboidal/altered texture, are known to significantly affect pulp chemistry and adversely affect flotation performance. Therefore, the main objectives of this study were to demonstrate influence of pyrite mineralogy on the flotation of copper (sulphidic) ores and develop alternative conditions to improve the performance.

Mechanism of microbial flotation using Thiobacillus ...

The floatability of pyrite in flotation was mainly reduced by T. ferrooxidans itself rather than by other microbial substances in bacterial culture as additive of flotation liquor. Floatability was suppressed within a few seconds by bacterial contact. The suppression was proportional to increasing the number of cells observed between bacterial ...

Selective separation of galena and sphalerite from pyrite ...

pre-flotation, which is a flotation stage prior to the galena flotation, is employed to remove part of the organic carbon. Following the pre-flotation stage, lead and zinc sulfides are floated in separate circuits and during the flotation process pyrite is floated to the concentrates.

(PDF) Electrochemical properties of pyrite, pyrrhotite ...

Therefore, it is conditions in the flotation of chalcopyrite and its separation from pyrite International Journal of Mineral Processing, vol. 69, 2003a. pp. 87–100. necessary that the flotation process is conducted during the preliminary stages of oxidation.

US5171428A - Flotation separation of arsenopyrite from ...

Arsenopyrite is separated from a mixture with pyrite by contacting the mixture with a sulfitic agent providing HSO 3 - ions at elevated temperature and pH below about 8 for a period sufficient to impart a selective depression property to the arsenopyrite. On addition of a collector the pyrite is rendered floatable, enabling froth flotation to achieve a concentrate rich in pyrite and tailings ...

Depression of pyrite in seawater flotation by guar gum ...

Pyrite flotation recovery was correlated with FBRM and PVM characterization to delineate the pyrite depression mechanisms by the guar gum. The high flotation recovery of pyrite with PAX was significantly lowered by guar gum, indicating that this polysaccharide could be used as an effective depressant in flotation with sea water.