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Analysis of surface modification on coal pyrite

2009-8-27  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

Analysis of surface modification on coal pyrite

Such surface modification of coal and pyrite particle to ward opposite directions leads to a good result of flotation separation. Modification mechanisms of coal and pyrite surface were analyzed.

Journal Papers Analysis of surface modification on coal pyrite

2021-8-5  Analysis of surface modification on coal pyrite. AUTHOR H Zhu, HL Li, Z Sh Ou, DZ Wang. file v102n05p315.pdf description Journal Paper Vol 102 No 05 Pg 315. page 315. Add comment. Name (required) E-mail (required, but will not display) Notify

Coal surface control for advanced fine coal flotation

2021-8-16  Investigation of mechanisms for the control of coal and pyrite surfaces prior to fine coal flotation is an important aspect of the project objectives. A second major objective is to investigate factors involved in the progressive weathering and oxidation of three base coals stored in three storage more » modes, namely, open, covered and in an

Influence of surface modification by sulfuric acid on

2017-4-19  Through XRD and XRF analysis, there were some minerals including quartz, kaolinite, illite and pyrite in the coking coal, so H + from the acid could react with minerals and other inorganic compounds which were progressively exposed on the surface and within pores of the coal particles (Seidel & Zimmels 1998). The relevant chemical reactions can

Surface structure-dependent hydrophobicity/oleophilicity

2020-7-25  The contact angle of diethyl phthalate droplet on the pyrite surface is obviously larger than that on the coal surface in ultrapure water. After acid treatment, the contact angle of reagent droplets on pyrite greatly decreased, while the contact angle on coal increased from 57.2° to 70.9°.

Experimental study on modification of physicochemical

2020-4-15  To study the modification of the physicochemical characteristics of acidified coal by surfactants and ionic liquids, N 2 adsorption, scanning electron microscopy and so on, combined with fractal theory were used. The results show that when the coal sample is treated with HNO 3, a large number of corrosion pores can be generated, and the aromaticity of the coal can be improved.

Effects of pyrite on the spontaneous combustion of coal

2015-9-28  Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion. The influences of various pyrite contents on the parameters of spontaneous combustion, such as index gases, temperature and released heat etc., were investigated in this study. Coal samples with different pyrite

Float-Sink (Washability) Test, Coal Analysis, Kentucky

2020-7-27  In a standard float-sink analysis, set amounts of the representative coal sample are crushed to a specified particle size and placed in liquids of known density or across a range of densities. Coal has relatively low density or specific gravity (1.2 to 1.5) compared to other rocks such as shale (2.4 to 2.8) or minerals such as pyrite (4.9 to 5.2).

Philip L Walker Jr Papers Pennsylvania State University

2006-10-9  Surface Areas and Pore Volumes of Coal Macerals, Fuel Vol 47 331-332. Surface Areas of Coals, Fuel Vol 47 322-324. Thermoelectric Power and Internal Friction of Some Graphitic Carbons, Tanso No 54 99-101 . 1969 The Effect of Oxygen

Influence of surface modification by sulfuric acid on

2017-4-19  Through XRD and XRF analysis, there were some minerals including quartz, kaolinite, illite and pyrite in the coking coal, so H + from the acid could react with minerals and other inorganic compounds which were progressively exposed on the surface and within pores of the coal particles (Seidel & Zimmels 1998). The relevant chemical reactions can

Flotation and surface modification characteristics of

2012-6-3  The XPS analysis results also show that in H2SO4 reactivating process, the surface hydroxides of galena are desorbed again by H2SO4 and replaced by diethyl dithiocarbamate, but those of sphalerite and pyrite are not desorbed. This flotation system may be applied to the bulk-differential flotation process of sulfur-bearing low-grade lead-zinc ores.

Liberation of Pyrite from Steam Coals

2018-6-10  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

Experimental study of influence regularity of pyrite

2021-1-1  When fine pyrite-bearing filling joints on the coal surface, the distribution of macro-cracks were less, and SEM image showed that the fracture surface was relatively flat. While many inclined and slender filling joints on the coal surface, the sample failure accompanied by more macro-cracks, and SEM image showed that there were more holes and

Transformation of Pyrite and Its Implication on Ash

2013-9-23  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

Effects of pyrite on the spontaneous combustion of coal

2015-9-28  Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion. The influences of various pyrite contents on the parameters of spontaneous combustion, such as index gases, temperature and released heat etc., were investigated in this study. Coal samples with different pyrite

Coal power Coal power Custom reagents reduce slagging

2019-1-29  Figure 2. Processing pyrite in coal combustion. “Excluded” and “Included” pyrite follow slightly different oxidation processes Figure 3. A high temperature probe duplicates boiler tube surface temperatures to simulate deposit bond and deposition rate. Deposits are then collected and analysed by a third-party laboratory.

Float-Sink (Washability) Test, Coal Analysis, Kentucky

2020-7-27  In a standard float-sink analysis, set amounts of the representative coal sample are crushed to a specified particle size and placed in liquids of known density or across a range of densities. Coal has relatively low density or specific gravity (1.2 to 1.5) compared to other rocks such as shale (2.4 to 2.8) or minerals such as pyrite (4.9 to 5.2).

Diagnosis of the Surface Chemistry Effects on Fine Coal

2013-7-24  In the present investigation, two coal samples were obtained from a typical Australian coal flotation plant using saline water and examined to identify surface chemistry effects on fine coal flotation which is an important issue confronting the coal industry. The speciation modeling indicated that hydrophilic precipitates may occur in the flotation circuits as a result of the use of high ionic

Diagnosis of the Surface Chemistry Effects on Fine Coal

2013-7-9  In the present investigation, two coal samples were obtained from a typical Australian coal flotation plant using saline water and examined to identify surface chemistry effects on fine coal flotation which is an important issue confronting the coal industry. The speciation modeling indicated that hydrophilic precipitates may occur in the flotation circuits as a result of the use of high ionic

Liberation of Pyrite from Steam Coals

2018-6-10  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

Experimental study of influence regularity of pyrite

2021-1-1  When fine pyrite-bearing filling joints on the coal surface, the distribution of macro-cracks were less, and SEM image showed that the fracture surface was relatively flat. While many inclined and slender filling joints on the coal surface, the sample failure accompanied by more macro-cracks, and SEM image showed that there were more holes and

Coal power Coal power Custom reagents reduce slagging

2019-1-29  Figure 2. Processing pyrite in coal combustion. “Excluded” and “Included” pyrite follow slightly different oxidation processes Figure 3. A high temperature probe duplicates boiler tube surface temperatures to simulate deposit bond and deposition rate. Deposits are then collected and analysed by a third-party laboratory.

Float-Sink (Washability) Test, Coal Analysis, Kentucky

2020-7-27  In a standard float-sink analysis, set amounts of the representative coal sample are crushed to a specified particle size and placed in liquids of known density or across a range of densities. Coal has relatively low density or specific gravity (1.2 to 1.5) compared to other rocks such as shale (2.4 to 2.8) or minerals such as pyrite (4.9 to 5.2).

Diagnosis of the Surface Chemistry Effects on Fine Coal

2013-7-9  In the present investigation, two coal samples were obtained from a typical Australian coal flotation plant using saline water and examined to identify surface chemistry effects on fine coal flotation which is an important issue confronting the coal industry. The speciation modeling indicated that hydrophilic precipitates may occur in the flotation circuits as a result of the use of high ionic

The Effect of Carbon Defects in the Coal–Pyrite Vacancy on

Pyrite is a mineral often associated with coal in coal seams and is a major source of sulfur in coal. Coal–pyrite is widely distributed, easily available, low-cost, and non-toxic, and has high light absorption coefficient. So, it shows potential for various applications. In this paper, the density-functional theory (DFT + U) is used to construct coal–pyrite with carbon doped in the

Study on Design and Cost Analysis of a Prototype Coal

As the washed coal is expected to have a high surface moisture, we recommend that consideration be given to the installation of a fluid bed type thermal dryer to dry the fine coal. "A Study of Process Costs and Economics of Pyrite Coal Utilization" by Arther D. Little, Inc. 12. PAGE 3 Raw Coal Analysis Total Pyritio Coal Size Sulfur

Pyrite formation from FeS and H2S is mediated through

2019-4-2  Pyrite is the most abundant iron−sulfur mineral in sediments. Over geological times, its burial controlled oxygen levels in the atmosphere and sulfate concentrations in seawater. However, the mechanism of pyrite formation in sediments is still being debated. We show that lithotrophic microorganisms can mediate the transformation of FeS and H2S to FeS2 at ambient temperature if

Mercury forms and their transformation in pyrite under

2020-2-10  Pyrite is considered to be the major carrier of mercury in coal. Here, the chemical characteristics of two natural pyrite samples of different weathering degrees were characterized by time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS). Thermal stability of Hg was also analyzed via temperature programmed desorption experiment (TPD).

Philip L Walker Jr Papers Pennsylvania State University

2006-10-9  Surface Areas and Pore Volumes of Coal Macerals, Fuel Vol 47 331-332. Surface Areas of Coals, Fuel Vol 47 322-324. Thermoelectric Power and Internal Friction of Some Graphitic Carbons, Tanso No 54 99-101 . 1969 The Effect of Oxygen