Analysis Of Surface Modification On Coal Pyrite

Analysis of surface modification on coal pyrite

Analysis of surface modification on coal pyrite Continuous scanning, speed 2°/min Sampling interval 0.02°. Results and discussion Figures 4–6 show the diffraction patterns of fresh, initially oxidized, and electrochemically reduced coal pyrite. The patterns show the following features: The characteristic of FeS2 is the strong peaks at

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Journal Papers Analysis of surface modification on coal pyrite

The SAIMM is a professional institute with local and international links aimed at assisting members source information about technological developments in the mining, metallurgical and related sectors.

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CHARACTERIZATION OF MINERAL AND COAL PYRITE

Electrochemical modification of the pyrite surface could enhance the flotation of pyrite and improve the separation of fine coal and pyrite. In this study, the surface properties of mineral and coal pyrites and the flotation behavior of three coals are compared.

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(PDF) Comparative study of the surface properties and the

Comparative study of the surface properties and the reactivity of coal pyrite and mineral pyrite Article (PDF Available) in Minerals and Metallurgical Processing 7(1):43-48 · February 1990 with

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Surface analysis of pyrite in the No. 9 coal seam, Wuda

The chemical composition of pyrite in coal can be used to investigate its geological and mineralogical origin. In this paper, high-resolution time-of-flight secondary ion mass spectrometry (TOF-SIMS) was used to study the chemical composition of various pyrite forms in the No. 9 coal seam (S t,d =3.46%) from the Wuda Coalfield, Inner Mongolia, northern China.

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Evolved gas analysis of coal-derived pyrite/marcasite

2014-01-07· The coal-derived pyrite/marcasite is different from mineral pyrite in thermal decomposition temperature. The mass spectrometric analysis results are in good agreement with the infrared spectroscopic analysis of the evolved gases. These results give the evidence on the thermal decomposition products and make all explanations have the sufficient

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Oxidation of coal and coal pyrite mechanisms and influence

OSTI.GOV Technical Report: Oxidation of coal and coal pyrite mechanisms and influence on surface characteristics. Technical progress report, May 31, 1995. Oxidation of coal and coal pyrite mechanisms and influence on surface characteristics. Technical progress report, May 31, 1995. Full Record;

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Control of pyrite surface chemistry in physical coal

The separation of pyrite from coal by flotation is based on exploiting the wettability difference between coal and pyrite. There is evidence that the wettability of coal pyrite changes upon superficial oxidation. Therefore, the oxidation of coal pyrite has been studied under carefully controlled

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Comparison Analysis of Coal Biodesulfurization and Coal’s

Acidithiobacillus ferrooxidans (A. ferrooxidans) was applied in coal biodesulfurization and coal’s pyrite bioleaching. The result showed that A. ferrooxidans had significantly promoted the biodesulfurization of coal and bioleaching of coal’s pyrite. After 16 days of processing, the total sulfur removal rate of coal was 50.6%, and among them the removal of pyritic sulfur was up to 69.9%.

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Modification Of Coal Crusher

Modifiion of coal crusher. Modification of coal crusher vegesnafoundationorg coal crusher machinecoal grinding mill plant mobile coal coal crushing and screening plant is the whole set of coal processing production line equipped with coal more info modification of coal crus. Read More NEWS; Analysis of surface modification for coal pyrite.

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Evolved gas analysis of coal-derived pyrite/marcasite

The coal-derived pyrite/marcasite is different from mineral pyrite in thermal decomposition temperature. The mass spectrometric analysis results are in good agreement with the infrared spectroscopic analysis of the evolved gases. These results give the evidence on the thermal decomposition products and make all explanations have the sufficient

Get Price

Oxidation of coal and coal pyrite mechanisms and influence

OSTI.GOV Technical Report: Oxidation of coal and coal pyrite mechanisms and influence on surface characteristics. Technical progress report, May 31, 1995. Oxidation of coal and coal pyrite mechanisms and influence on surface characteristics. Technical progress report, May 31, 1995. Full Record;

Get Price

Control of pyrite surface chemistry in physical coal

The separation of pyrite from coal by flotation is based on exploiting the wettability difference between coal and pyrite. There is evidence that the wettability of coal pyrite changes upon superficial oxidation. Therefore, the oxidation of coal pyrite has been studied under carefully controlled

Get Price

(PDF) Comparison Analysis of Coal Biodesulfurization and

Comparison Analysis of Coal Biodesulfurization and Coal’s Pyrite Bioleaching with Acidithiobacillus ferrooxidans Fen-Fen Hong, 1 Huan He, 1 Jin-Yan Liu, 2 Xiu-Xiang Tao, 1 Lei Zheng, 3 and Yi

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1. Introduction

After processing with bacteria, the pyrite and kaolin peaks reduced subtly. It seems that the decrease of ash of coal samples was mainly caused by the reduction of pyrite. In the XRD analysis of the original pyrite, residuals in bioprocess experiments by A. ferrooxidans are shown in Figures 4 (b 1) and 4 (b 2).

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Effects of pyrite on the spontaneous combustion of coal

2015-09-28· Three forms of sulfur exist in coal: pyrite, sulfate and organic sulfur (Lu and Liu 1999).Pyrite plays a vital role in coal spontaneous combustion. The specific heat of pyrite is only one-third of that of coal; but with the same heat absorption, the temperature rise of pyrite is three times higher when compared to coal.

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Pyrite Wikipedia

Pyrite is considered the most common of the sulfide minerals. Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.

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Coal Desulfurization Using Bacteria Adaptation And

The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.

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Coal desulfurization using bacteria adaptation and

1988-10-04· (b) adapting said culture from step (a) to pyrite as a nutrient medium and to coal-pyrite surface modification conditions by slurring the bacteria of said culture from step (a) with -200 mesh pyrite, or -200 mesh coal pyrite of a pyrite content of about 60 percent, and stirring and aerating for at least six weeks at a pH level below about 4.0

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Surface Oxidation of Pyrite as a Function of pH

Pyrite, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as acid mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation of pyrite was studied in batch experiments over a large range of pH (2.5−12), with trace oxygen. Surface analysis of the samples was performed using X-ray

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Coal desulfurization using bacteria adaptation and

1988-10-04· (b) adapting said culture from step (a) to pyrite as a nutrient medium and to coal-pyrite surface modification conditions by slurring the bacteria of said culture from step (a) with -200 mesh pyrite, or -200 mesh coal pyrite of a pyrite content of about 60 percent, and stirring and aerating for at least six weeks at a pH level below about 4.0

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Suppression of Pyrite Oxidation by Surface Silica Coating

The exposure of pyrite (FeS2) to atmospheric conditions during mining activity causes a series of complex oxidation reactions, resulting to acid generation and the subsequent release of toxic heavy metals in the surrounding aquatic and terrestrial ecosystems. The produced acidic mine waters, known as acid mine drainage (AMD), constitute one the major environmental problems of both operating

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US4775627A Coal desulfurization using bacteria

The surfaces of the pyrite particles are modified so as to be more hydrophilic by pre-conditioning of the coal with a culture of thiophilic bacteria such as Thiobacillus ferroxidans, and the coal is then subjected to the separation process. The bacterial culture is preadapted to pyrite and to the pyrite surface modification step conditions for

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Influence of surface modification by sulfuric acid on

It indicated that the content of inorganic minerals on coal surface decreased but the organic materials (carbon) on coal surface increased after pretreated by sulfuric acid. It seemed that the inorganic minerals reacted with H + and the ions shed from coal surface, which also be described in ash content and SEM analysis.

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Transformation of Pyrite and Its Implication on Ash

Transformation of Pyrite and Its Implication on Ash Deposition during Oxy-coal Combustion Dunxi Yu . Weizhi Lv, Jianqun Wu . Lanlan He, Minghou Xu . State Key Laboratory of Coal Combustion (SKLCC) Huazhong University of Science & Technology (HUST) Wuhan, Hubei, China . Ponferrada, Spain, 9th 13th September 2013

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Surface Spectroscopic Studies of Factors Influencing

Read "Surface Spectroscopic Studies of Factors Influencing Xanthate Adsorption on Coal Pyrite Surfaces, Surface and Interface Analysis" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Standard Test Methods for Proximate Analysis of Coal and

Note 1: The ash obtained differs in composition and amount from the mineral constituents present in the original coal. Combustion causes an expulsion of all water, the loss of carbon dioxide from carbonates, the conversion of iron pyrite into iron oxides and sulfur oxides, and other chemical reactions.

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Liberation of Pyrite from Steam Coals

Modification of the pulverization proc-ess offers a promising means of reducing the sulfur content of coal prior to its be-ing burned. For this to be possible, however, practical methods are needed (a) for liberating the pyrite present in coals, and (6) for removing the pyrite once it has been liberated. This is believed possible if advantage

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OXIDATION OF COAL AND COAL PYRITE MECHANISMS AND

Oxidation of Coal and Coal Pyrite: FM.Doyle. Univ. California at Berkeley 2/28/95 b. Oxidation Treatments Upper Freeport bituminous coal from the Troutville #!2 Mine, Clearfield County, Pennsylvania was oxidized thermally in air by heating the coal in a Precision mechanical convection oven at

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Coal Sulfur Measurements EPA

The plasma procedure liberates this pyrite from the coal matrix, thereby facilitating Its dissolution via nitric acid attack. 4.2 SULFUR SPECIATION IN LIQUIFIED COAL SAMPLES The present state of the art for coal analysis is seriously deficient for the sulfur forms analysis of samples in which the coal matrix has been altered significantly. This

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