Recent Progress on Pyrite FeS2 Nanomaterials for Energy ...

The pyrite cathode was fabricated using the doctor blade method by mixing pyrite uniformly with poly (vinylidene fluoride) PVDF (binder) and N-methyl-pyrrolidone NMP (conducting agent) on aluminium foil substrate. The electrodes (1.1 cm diameter) were obtained after drying at 80 °C for 12 h and dried again at same temperature for 24 h.

Production of pyrite nanoparticles using high energy ...

Sonocatalytic performance of pyrite nanoparticles was evaluated by the degradation of sulfasalazine (SSZ). Pyrite nanoparticles were produced via a high energy mechanical ball milling (MBM) in different processing time from 2 h to 6 h, in the constant milling speed of 320 rpm.X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray …

Microstructural characterization of pyrite during ...

mechanically activated pyrite increased as a function of milling time, implying that pyrite lattice volumes were expanded probably due to vacancy formation. Regarding to shape

Oxidation of pyrite (FeS2) and troilite (FeS) impurities ...

Valorisation of locally available clays for producing blended cements is crucial for a widespread adoption of sustainable binders incorporating these materials. In some places, clays can be intermixed with small amounts of iron sulfides, which could eventually expand in the alkaline media of concrete and lead to cracking if clay particles are sufficiently fine. This study …

Degradation of p-nitrophenol by nano-pyrite catalyzed ...

Degradation of p-nitrophenol by nano-pyrite catalyzed Fenton reaction with enhanced peroxide utilization† Tong Liu, ab Nan Chen, b Yang Deng,b Fangxin Chenb and Chuanping Feng *ab Pyrite (FeS 2) catalyzed conversion of H 2O 2 into oxidants is increasingly recognized as a promising Fenton- like process for treating recalcitrant contaminants.

Effect of Inorganic Ions on Pyrite Catalyzed Fenton …

Mineral pyrite (Alfa Aesar) was first manually ground. Then, mechanical milling was performed at 600 rpm in an ethanol medium (planetary ball mill Retsch PM 100 CM). Zirconium oxide balls (diameter: 2, 5 and 10 mm) were used for milling by balls to powder weight ratio of 10:1. The surface areas of the materials were calculated using the Brunauer-

Development of a novel pyrite/biochar composite (BM …

As a natural reduction mineral, pyrite (FeS 2), was combined with biochar by simply ball milling technology to synthesize FeS 2 @biochar composite (BM-FeS 2 @BC) and applied for the removal of hexavalent chromium (Cr(VI)) in aqueous solution. SEM, XRD, FTIR, and XPS characterization results showed that the FeS 2 and biochar were successfully combined and …

Characterization of structural changes of mechanically ...

The kinetics of the thermal decompositions of mechanically activated pyrite and non-activated pyrite was studied by using Friedman method at different …

Pyrite In The Manufacture Of Iron - African Pegmatite

Pyrite In The Manufacture Of Iron. Iron pyrite (iron (ii) disulfide, FeS 2, herein referred to as pyrite) is a naturally occurring sulfide of iron, and is one of the most common sulfides. Pyrite is found in large amounts in quartz seams, in sedimentary and metamorphic rocks, and alongside coal deposits. Aside from its metallic lustre giving it ...

Pyrite from coal mining: High-energy milling and analysis ...

In this work, pyrite from coal mining was subjected to high-energy milling and the particle size reduction, electrical and optical properties were evaluated. With the milling parameters used, the apparent size of the crystallites was reduced from 34.7 nm to 23.8 nm, resulting in highly unstable particles and charge carriers with low mobility.

(PDF) Microstructural characterization of pyrite during ...

The kinetics of the thermal decompositions of mechanically activated pyrite and non-activated pyrite was studied by using Friedman method at different …

Enhancement of Ball-milling on Pyrite/Zero-valent iron for ...

This study developed a efficient method to activate PS by FeS2 modify Fe⁰ prepared by ball milling a mixture of Fe⁰ and FeS2, which can provide some new insights into the degradation of ...

Fe-FeS2 adsorbent prepared with iron powder and pyrite …

The Fe-FeS 2 adsorbent was fabricated via facile ball milling of iron powder and pyrite with an all-round planetary ball mill (QM-QX4, Nanjing University Instrument Factory). First, 10.0 g of the mixture (iron powder and pyrite) was loaded into a stainless pot (500 mL inner volumes).

Reductive Immobilization of Rhenium in Soil and ...

This study reports a method for preparation of pyrite nanoparticles and experimental results of reductive removal of perrhenate (a surrogate for radioactive pertechnetate) from water using the nanoparticles. The pyrite nanoparticles were prepared by ball milling in ethanol. Batch kinetic tests and column tests indicated that the pyrite nanoparticles were able to rapidly …

Journal of Magnetism and Magnetic Materials

Pyrite Jet milling Grain refinement ABSTRACT In this paper, the methods to solve the uniformity problem of sulfur (S) element were studied in pyrite-doped Nd-Fe-B sintered magnets. With pyrite addition, the coercivity was enhanced, except for the magnets with pyrite doped by arc melting. Sulphur loss existed during the arc melting process.

Rcovery of gold in pyritic ores - Mine Engineer.Com

The pyrite in which small amounts of gold occurs is of crystalline variety (primary pyrite). The characteristics of primary pyrite are a absence of porosity, an extreme brittleness, a resistance to oxidation, and the existence of gold possessing a weak susceptibility to magnetism (due to a fine coating of a iron compound).

Deep abiotic weathering of pyrite

Pyrite, also called fool's gold, is an iron sulfide mineral that is very commonly found in rock but is almost nonexistent in sediments today. Pyrite oxidizes quickly and is a major source of sulfur to the ocean, but it is also a proxy for the oxygen content historically in …

Mechanical milling of auriferous arsenopyrite and pyrite ...

Milling for longer than 88 h resulted in the total breakdown of arsenopyrite to form pyrrhotite and an arsenic sulphide compound of unknown composition. By changing the ratio of arsenopyrite to pyrite in the vial. but keeping the milling time constant (24 h). different arsenopyrite products formed.

milling of pyrite and arsenopyrite to liberate gold small ...

Mechanical milling of auriferous arsenopyrite and pyrite ... Sep 15, 1996 The purpose of this work was to study the behaviour of arsenopyrite and pyrite when milled together. and evaluate the potential of the conversion of arsenopyrite and pyrite by milling to a product from which gold could be extracted, :rnd in which the resulting product is not a cyanicide and is …

A method for generating uniform size-segregated pyrite ...

Pyrite powders are usually prepared by grinding a homogenous, massive pyrite sample using an agate mortar and pestle [10,16-18] or a mixer mill . To achieve a specific size range of material for experiments, samples are either dry sieved [17,18], wet sieved, or both . Sieved samples are then cleaned in various ways to remove fine particles ...

Effects of mechanical activation methods on thermo ...

To explore the effects of mechanical activation methods (ball mill, planetary mill and rod mill) on the oxidation and the spontaneous combustion of pyrite, the kinetic curves of non-activated pyrite and mechanically activated pyrite were created by simultaneous thermal analysis. The structural characteristics and changes of mechanically activated pyrite were investigated …

Method of and apparatus for the treatment of pyrite ...

A method of and an apparatus for the treatment of mineral coal containing pyrite wherein the mined mineral product is milled, classified into a fine component and a coarse component, the coarse component is recycled and the coarse component in whole and in part is subjected to density suspension so that a light product consisting predominantly of coal is separated from a …

A method for generating uniform size-segregated pyrite ...

Standardized sample preparation techniques allow comparison of pyrite dissolution experiments under diverse conditions. Our objective was to assess dry and wet sieving preparation methodologies, and to develop a reproducible technique that yields uniformly size-distributed material within a limited size range of interest. Here, we describe a wet sieving …

Irradiation - uni-due.de

(pyrite) by simple and cost-effective method, high-energy ball milling technique. In this technique, fine alloying particles can be formed from coarse powders through mechanochemical reaction [5]. Effect of milling time on the morphology, particle size distribution and photocatalytic activity were also studied. Milling time (h)

Impact of mechanical activation and ... - ScienceDirect

In this paper, a new pretreatment method was employed for the enhancement of pyrite mineral dissolution by using mechanochemical activation. The mechanochemical activation was carried out by co-milling of pyrite and iron powder for 20 and 50 min.The XRD analysis indicated that a fraction of pyrite and iron phase remained and troilite (FeS) was formed as a new phase …