• منطقة بودونغ الجديدة ، شنغهاي ، الصين .
  • [email protected]
blog image blog image

Hydrophobic Agglomeration of Fine Pyrite Particles Induced by Flotation …

Flotation reagents can change the surface properties of minerals, leading to differences in the interaction between mineral particles and affecting the mutual aggregation or dispersion of particles. In this work, we studied the role of activator copper sulfate, collector butyl xanthate and frother terpineol in adjusting the potential energy of pyrite particles from the …

اقرأ المزيد
blog image blog image

Thiocarbonate collectors in pyrite flotation ? fundamentals …

THIOCARBONATE COLLECTORS IN PYRITE FLOTATION ­ FUNDAMENT ALS AND APPLICATIONS Ronel du Plessis and Jan D. Miller Dept. of Metallurgical Engineering, University of Utah, 135 South 1460 East Rm412, Salt Lake City UT 84112-0114, USA.

اقرأ المزيد
blog image blog image

Sulphidisation of oxides and oxidised sulphides and adsorption of …

1 1.Introduction. The practise of froth flotation, a physico-chemical process based on exploiting differences in surface wettability to effect a separation between valuable and gangue minerals [], presents the most economical and efficient enrichment method for ores in the mining sector.However, the ever increasing demand for metals and the depletion of high grade ores …

اقرأ المزيد
blog image blog image

Flotation behaviors of pyrites with different chemical …

Electrochemical measurements were conducted to understand the flotation mechanism using the potential-pH diagrams drawn for the system studied. …

اقرأ المزيد
blog image blog image

Pyrite Flotation Separation and Encapsulation: A

10%Pyrite Flotation These tests were aimed at separating the pyrite contained in the cyclone underflow so that they can be stored underwater in the fines area. The flotation tails, which contains low-sulfur tailings with little or no acid-generating capacity are currently being used as filler material in the construction of the dyke.

اقرأ المزيد
blog image blog image

Minerals | Free Full-Text | Effects of Pyrite Texture on Flotation ...

Ore B contained framboidal pyrite and altered pyrite/marcasite, which is considered the main reason for the low flotation performance in both copper and pyrite flotation sections of the process plant. Flotation tests were conducted under different conditions using the two ore samples and a 50:50 blend.

اقرأ المزيد
blog image blog image

Pyrite flotation: Magma Copper Company's Superior Facility

pyrite flotation is in operation, the tailings sands, which are the underflow of the cyclone, go to the ... Mining was conducted at the facility from 1912 until 1982 when the mill. and mine shut down due to depressed copper prices. The mine was reopened in 1990.

اقرأ المزيد
blog image blog image

Floatation of Ok Tedi Pyrite - ausimm.com

conducted to determine the composition, natural floatability and xanthate flotation behaviour of the various types of pyrite in the ore. The flotation results show that while some types of pyrite float well at high pH values, others are readily depressed. The implications of these results for Ok Tedi flotation plant have been Considered.

اقرأ المزيد
blog image blog image

Pyrite Recovery Mechanisms in Coal Flotation

Flotation experiments were carried out in a laboratory-scale coal flotation column, using coal prepared in the same manner as that used in the conventional coal flotation tests. Since it is not practical to liberate coal pyrite …

اقرأ المزيد
blog image blog image

minerals-07-00040.pdf - Article Flotation and Adsorption of...

XRD patterns of the purified samples: (a) pyrite; (b) talc (P = pyrite, T = talc). 2.2. Flotation Tests Both the single mineral (3 g) microflotation and the artificial mixed mineral (3 g) flotation were conducted in a 40 mL hitch groove flotation cell with a spindle speed of 1600 r/min.

اقرأ المزيد
blog image blog image

Flotation behaviors of pyrites with different chemical compositions

Microflotation tests, electrokinetic and electrochemical measurements were carried out to investigate the flotation behavior of pyrite samples taken from different regions of Turkey. Chemical analyses and mineralogical examinations showed that these pyrite samples have different impurities and structural properties. The flotation characteristics of pyrites using …

اقرأ المزيد
blog image blog image

Pyrite Flotation Separation and Encapsulation: A ... - Springer

Pyrite flotation separation and encapsulation in tailings dams is proposed as a viable way to chemically stabilize tailings. Characterization of potential ... All tests were conducted with a stirring time of 10 min. Sedimentation after 5, 10, 15, 20, and 30 min were measured in a 1000 mL graduated cylinder with a manual vertical axis agitator ...

اقرأ المزيد
blog image blog image

Complex sulphide ore processing with pyrite …

The recovery of pyrite to the ensuing zinc concentrate fell by approximately 50% as a result of the prior pyrite flotation in nitrogen. Experiments were also conducted with a modified procedure. In one test a single bulk float and …

اقرأ المزيد
blog image blog image

THE EFFECT OF SULPHITE ON THE XANTHATE-INDUCED …

flotation of copper-activated pyrite in an air atmosphere was lower compared to the same experiment with nitrogen purging. Recovery of pyrite was 71.8% in nitrogen and 55.6% in air. The combination of sodium bisulphite and air purging decreased the ... conducted to identify the depression effects of sodium bisulphite on the xanthate-

اقرأ المزيد
blog image blog image

(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.

اقرأ المزيد
blog image blog image

"Depression of Pyrite Flotation by Microorganisms as a Function …

It has been reported in the literature that microorganisms, particularly the bacteria Thiobacillus ferrooxidans, can depress the flotation of pyrite particles during coal flotation. The study reported in this paper was conducted to answer two questions that have not been adequately addressed in the literature: 1. How much ability do the bacteria have to depress pyrite …

اقرأ المزيد
blog image blog image

Conditioning in the flotation of gold, uranium oxide, and pyrite

was used for flotation. Care was taken so that heavy par-ticles could not stay behind and consequently cause large losses of gold and pyrite. Flotation was conducted in a laboratory-size 9-litre Denver 12 flotation cell at an impeller speed of 1500r/min and at constant air-feed rate. Approximately 13g/t of

اقرأ المزيد
blog image blog image

Testing of pyrite flotation techniques on selected Ohio coals: …

The U.S. Department of Energy's Office of Scientific and Technical Information

اقرأ المزيد
blog image blog image

Leaching of the arsenopyrite/pyrite flotation concentrates …

cyanidation leach tests were conducted on the reductive leach residues. The arsenopyrite/pyrite flotation concentrate, mainly studied in the hydrochloric acid medium, decomposed through the non–oxidative chemical dissolution reaction and the reductive decomposition reaction for the arsenopyrite and pyrite components, respectively.

اقرأ المزيد
blog image blog image

Minerals | Free Full-Text | A Novel Method to Limit the …

A novel method to limit the adverse effect of fine serpentine on the flotation of pyrite was investigated in this paper. The flotation results showed that coarser serpentine possessed a weaker depression effect on the pyrite …

اقرأ المزيد
blog image blog image

Flotation separation of arsenopyrite from pyrite

Arsenopyrite is separated from a mixture with pyrite by contacting the mixture with a sulfitic agent providing HSO.sub.3.sup.- 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 …

اقرأ المزيد
blog image blog image

The depression of pyrite in selective flotation by

At low xanthate concentrations, pyrite flotation presents two maximums at around pH 4 and 8 with depression around pH 7. The high flotation yield at pH 4 is due to the formation of sulfur-rich products and dixanthogen ( Leppinen, 1990, Wang and Forssberg, 1991, López Valdivieso et al., 2005 ).

اقرأ المزيد
blog image blog image

Pyrite Flotation - Metallurgist & Mineral Processing Engineer

Can you list the factors affects the floatability of pyrite from refractory low grade ore. I used a Wemco lab flotation cell and aimed on analysing factors like collector dosages (PAX), Activator (Copper sulphate),MIBC, pH and others like pulp density and particle size (70 and 150 microns) .However how these factors affect the floatability of the pyrites from low grade refractory ore.

اقرأ المزيد
blog image blog image

Studies on the application of N,N-bis(phosphonomethyl)-sulfamic …

The flotation of pyrite is often depressed by the slime coating of fine serpentine. To eliminate the negative effect of serpentine, N,N-bis(phosphonomethyl)-sulfamic acid (SABMP) was employed as the depressant in this study. ... And then the flotation was conducted for 3 mins. After flotation, both the concentrate and tailing were collected ...

اقرأ المزيد
blog image blog image

Frontiers | Effect of Grinding Media on Grinding-Flotation …

The flotation test was conducted in a 40 ml XFG flotation machine. The flotation machine rotational speed of the impeller was 1,992 r/min, and each flotation used 2 g of the samples. We added 2 g of the samples and distilled water into a 50 ml beaker. The suspended minerals were placed in an ultrasonic bath for 5 min.

اقرأ المزيد
blog image blog image

Pyrite flotation in the presence of galena. Study on galvanic …

collector indicated that pyrite was nobler than galena under all investigated conditions. Therefore, pyrite served as a cathode in galvanic interactions with galena. Floatability of pyrite was performed alone and as a mixture with galena in the ratios of pyrite to galena equal to 1:4, 1:1 and 4:1. The experiments were conducted with air and ...

اقرأ المزيد
blog image blog image

The depression of pyrite in selective flotation by different …

Pyrite may float due to natural or self-induced hydrophobicity or collector-induced hydrophobicity. Its flotation can also be enhanced by the activation of copper or lead ions emanating from other minerals. Depressants are generally required to selectively depress pyrite.

اقرأ المزيد
blog image blog image

Minerals | Free Full-Text | Effects of Pyrite Texture on Flotation ...

It is known that selective flotation of the base metal sulfide minerals from pyrite is strongly influenced by the type and concentration of metal oxidation species produced during grinding [ 17 ]. These species may affect the floatability of minerals, rendering the surfaces hydrophilic or leading to inadvertent activation [ 18, 19 ].

اقرأ المزيد
blog image blog image

The selective flotation of arsenopyrite from pyrite | Request PDF

Ore flotation results indicate that H2O2 has the best selectivity for the As-S separation. When H2O2 is used, the As content in pyrite concentrate decreases from 2.27% without addition of …

اقرأ المزيد
blog image blog image

Flotation behaviors of pyrites with different …

The flotation behavior of pyrite with different collectors was investigated as a function of pH and the results are given in Fig. 2. The purified pyrite sample was floated well between pH 3 and 6 ...

اقرأ المزيد
blog image blog image

pyrite flotation conducted

Bench scale flotation tests with pyrite cinder were systemically conducted. Firstly, the roughing-circuit aiming to find the appropriate size of grinding product and dosage of reagents were tested. The flotation separation flowchart is shown in Fig.4, and the results of separation are shown in Fig.5. As shown in Fig. 5(a), the optimum mean particle

اقرأ المزيد
blog image blog image

Flotation behaviors of pyrites with different chemical compositions

10%Electrochemical measurements were conducted to understand the flotation mechanism using the potential-pH diagrams drawn for the system studied. The results revealed that impurities and structural differences among the various pyrite samples have little or no effect on their flotation behaviors.

اقرأ المزيد
blog image blog image

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

When the flotation of pyrite was conducted at mildly acidic and neutral pH with CuSO 4 as activator, pyrite may not be activated effectively by CuSO 4. 3.4. XPS Analysis. In order to further investigate the surface properties and adsorption characteristics of pyrite conditioned with CuSO 4 at different pH, XPS surface analysis was carried out.

اقرأ المزيد
blog image blog image

CHAPTER 7 FLOTATION OF SULPHIDE MINERALS - Hacettepe

Above pH 11, the surface of pyrite is of ferric hydroxide (Fe(OH) 3), a hydrophilic compound. Calcium ion contributed by lime in pH adjustment also adds to pyrite depression. Flotation is affected about one pH unit lower if CaO is used for raising pH compared with KOH or K 2 CO 3 The pzc for pyrite is at pH = 6.9.

اقرأ المزيد
blog image blog image

Optimization of a Copper/Molybdenum Flotation Circuit by …

A study to determine methods to hinder the flotation of pyrite, other than the specific use of lime, in rougher flotation was conducted. Specifically, the goal was to determine an effective alternative to pH adjustment using lime. Experiments were conducted using the most common selection of reagents: xanthate and lime to recover

اقرأ المزيد