Our Pyrite coal enhancement

US4324560A - Pyrite removal from coal - Google Patents


US4324560A US06/127,346 US12734680A US4324560A US 4324560 A US4324560 A US 4324560A US 12734680 A US12734680 A US 12734680A US 4324560 A US4324560 A US 4324560A Authority US United States Prior art keywords coal pyrite organic coarse media Prior art date 1980-03-05 Legal status (The legal status is an assumption and is not a legal conclusion.

CHARACTERISTICS AND MECHANISMS OF ROCK MAGNETIC ...


characteristics and mechanisms of rock magnetic enhancement in underground coal spontaneous combustion areas——examples of the wuda coal mine of inner mongolia and rujigou coal mine in ningxia: xiong sheng-qing, yu chang-chun

Desulphurization of Coal to Protect the Environment ...


The major coal desulphurization technologies prior to combustion are physical coal cleaning, chemical and biological methods. ... Huang, H.T.L., Handur-Kulkarni, S.N. (1991), The enhancement of the selectivity of the oil agglomeration for the elimination of iron pyrite from coal, 8` h Annual International Pittsburgh Coal Conference Proceedings, ...

Selective magnetic enhancement of pyrite in coal by ...


Separation of pyrite from coal would be facilitated by changing a portion of each pyrite particle to a more magnetic form. The selective magnetic enhancement of pyrite in coal by dielectric heating was investigated fundamentally and experimentally.

The chemical enhancement of the triboelectric separation ...


@article{osti_10120574, title = {The chemical enhancement of the triboelectric separation of coal from pyrite and ash: A novel approach for electrostatic separation of mineral matter from coal. Final report}, author = {Gustafson, R.M. and DiMare, S. and Sabatini, J.}, abstractNote = {Arthur D. Little, Inc., under contract to the US DOE Pittsburgh Energy Technology Center, has developed a ...

Clean Desulphurization of High-Sulfur Coal Based on ...


electromagnetic parameters during the process of microwave dielectric enhancement of fine coal ... minerals and is applied to the desulfurization of fine coal (mainly pyrite).16,17 The magnetic properties of pyrite can be improved by heating treatment.18 Compared with coal, pyrite

Study of magnetic enhancement of coal-derived pyrite by ...


Yiluo nodular coal-derived pyrite was pyrolyzed in a self-designed pyrolysis instrument under different pyrolysis temperatures from 200 to 800 ℃.The Nitrogen flow rate and the holding time were 0.1 L/min and 10 minutes respectively.The results show that: the magnetic susceptibility reached maximum value at 700 ℃ and increased more than two magnitude as well as no heat treatment;the ...

Iron Pyrite in Resin Bonded Wheels & Brake Linings ...


Oct 24, 2019· Iron Pyrite for grinding wheels is added in the pure monocrystalline form, taking a splinter, or needle-type shape, this addition not only helps with the enhancement of thermal conductivity as mentioned before, but enhances tensile strength and porosity of the resin bonded abrasive.

Tracking pyritic sulfur in the microwave desulfurization ...


Magnetic desulfurization is an attractive physical method of coal cleaning which has been studied for a quarter century. High‐frequency selective heating of coal to convert nonmagnetic pyrite to moderately magnetic pyrrhotite has been suggested to enhance separation. Despite predicted feasibility, some successes have only recently been attained.

Fuel Contaminants: Volume 3 - Control of Coal-Related ...


Objective The objectives of this study were to determine the feasibility of coal recovery from coal cleaning plant wastes by immiscible fluid agglomera- tion technique and to evaluate the effects of physical and chemical treat- ments on enhancement of pyrite removal during agglomeration of these wastes Background Water immiscible liquids ...

(PDF) Coal and Potash Flotation Enhancement using a Clay ...


Coal and Potash Flotation Enhancement using a Clay Binder Article (PDF Available) in Canadian Metallurgical Quarterly 46(3):243-250 · September 2007 with 160 Reads How we measure 'reads'

Enhanced Coalbed Methane (ECBM) Field Test at South ...


Enhanced Coalbed Methane (ECBM) Field Test at South Qinshui Basin, Shanxi Province, China Bill Gunter, Sam Wong, David Law, ARC Feng Sanli,Ye Jianping, Fan Zhiqiang, CUCBM GCEP workshop ... enhancement compared to primary production, and that substantial CO2 storage in the coal seam is

(PDF) Enhanced magnetic separation of pyrite from coal ...


PDF | The objective of this research was to improve the magnetic separation of coal and pyrite by enhancing the magnetic susceptibility of pyrite in run-of-mine coal through the use of selective ...

Coal pyrite microwave magnetic strengthening and ...


Nov 10, 2017· The coal pyrite from SX, SD and NM regions were chosen to simulate the strengthening behavior of pyrite by the process of microwave enhancement of fine coal. Fig.5 shows the relationship between the complex permittivity's real part of coal pyrite and microwave frequency from the three different areas. The complex permittivity's real part of the ...

1 Microwave Heating Characteristics and Microwave …


ABSTRACT: In this study, microwave heating characteristics and microwave assisted magnetic enhancement of pyrite were investigated. Studies include the microwave heating of pyrite samples having size fractions of - 1680+1200 urn, -1200+ 850um, -850+420um, and -420 urn in a microwave oven at 850 W, 680 W and 510

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


Oct 15, 2019· Pyrite is part of the tailings from coal mining and presents a great valorization potential technological, economic and environmental in the production of nanoparticles. In this work, pyrite from coal mining was subjected to high-energy milling and the particle size reduction, electrical and optical properties were evaluated.

Study of Enhanced Fine Coal De-sulphurization and De ...


Study of Enhanced Fine Coal De-sulphurization and De-ashing by Ultrasonic Flotation Article in Journal of China University of Mining and Technology 17(3):358–362 · September 2007 with 35 Reads

OSTI.GOV Technical Report: Control of pyrite surface ...


@article{osti_5474691, title = {Control of pyrite surface chemistry in physical coal cleaning}, author = {Yoon, R.H. and Luttrell, G.H. and Zachwieja, J.B. and Mielczarski, J.A.}, abstractNote = {The separation of pyrite from coal by flotation is based on exploiting the wettability difference between coal and pyrite. There is evidence that the ...

The kinetics and mechanism of pyrite thermal decomposition ...


Pyrite (FeS 2) decomposition in He, N 2, CO 2 ‐CO‐SO 2, O 2 ‐CO 2 and H 2 S‐H 2 gas mixtures was studied from 400–590°C using optical microscopy, X‐ray diffraction, electron microprobe analyses, and gas chromatography. The rate constants were determined from the weight loss and the thickness change of pyrite in reacted samples.

Final Techni cal Report Sept through Aug. 31, 1987 Project ...


either pyrite in whole coal or coal derived pyrite. High cell concentrations and alkaline pH improved the degree of suppression, particularly for fine but not ultrafine pyrite. An E. coli strain extract however showed 50% added suppression for both a mineral and coal derived pyrite.

Dr Reydick Balucan and Dr Karen Steel Centre for Coal Seam ...


4 stimulated coal core using Synchrotron radiation. The 3D visualisation of the permeability pathway (blue, voxel resolution = 11 µm) for each sector are shown. Figure 3. Permeability enhancement via dissolution of pyrite by H 2 O 2 - H 2 SO 4. Figure 5. Permeability enhancement due to the oxidative degradation of macerals in coal by H 2 O 2 ...

Mercury thermospecies in coal: enhancement of mercury ...


Mercury thermospecies in coal: enhancement of mercury removal technologies Introduction The mercury concentration in coal varies in a wide range from less than 1 ppb to 300 ppm (more than 5 orders of magnitude) [1, 2].

Magnetic enhancement of pyrite by caustic microwave ...


In order to try to establish the mechanism of magnetic enhancement, both mineral pyrite and magnetically enhanced coal-derived pyrite were studied after treatment using X-ray diffraction, magnetic susceptibility measurement, EDAX and ESCA analysis, and chemical analysis of the leach solutions to ascertain the nature of the new magnetic phase ...

Coal desulfurization and demineralization by chemical ...


Coal desulfurization and demineralization by chemical/physical treatments Chen-Wen Fan Iowa State University ... Fan, Chen-Wen, "Coal desulfurization and demineralization by chemical/physical treatments " (1984).Retrospective Theses and Dissertations. 8818. ... Magnetic enhancement of pyrite in coal 64 Magnetic seeding 64

Enhanced desulfurizing flotation of coal using ...


Enhanced desulfurizing flotation of low sulfur coal was investigated using sonoelectrochemical method. The supporting electrolyte used in this process was sodium chloride and the additive was ...

HGMS coal desulfurization with microwave magnetization ...


HGMS coal desulfurization with microwave magnetization enhancement Abstract: The performance of high-gradient magnetic separation (HGMS) in removing mineral pyrite from coal has been improved by increasing the pyrite's magnetization through selective microwave heating. Separations were carried out on conventional 2-T iron magnet separators and ...

Analysis of dielectric heating and conductive cooling of ...


Initially a complete literature survey was performed on related types of high-gradient magnetic separators, iron-sulfur system transformations, and various coal pretreatments yielding magnetic enhancement of pyrite. The selective magnetic enhancement of pyrite in coal by dielectric heating was investigated theoretically and experimentally.

INDUCING FRACTURES AND CLEAT APERTURE …


INDUCING FRACTURES AND CLEAT APERTURE ENHANCEMENT IN BITUMINOUS COAL VIA THE APPLICATION OF MICROWAVE ENERGY APPLIED UNDER HYDROSTATIC STRESS CONDITIONS A Thesis in Energy and Mineral Engineering by ... 2.5.2 Improved pyrite separation from coal ..... 35 2.5.3 Improved economics of grindability (comminution)..... 36 2.6 OPTICAL MICROSCOPY AND X ...

Microwave enhanced high gradient magnetic desulfurization ...


Magnetic enhancement and demineralization of eastern coals. Second yearly technical progress report. Technical Report Kelland, D.R. We now have our first successful indications that selective microwave heating of coal pyrite improves the reduction of sulfur by high gradient magnetic separation (HGMS). The clean coal products of our magnetic ...

Fuel Contaminants: Volume 4 - Application of Oil ...


With regard to the enhancement of pyrite removal during agglomer- ation, use of sodium metaphosphate will remove 42 percent of the pyritic sulfur from freshly ground minus 48 mesh coal. This is the same as that obtained by float-sink analysis suggesting removal of all" the liberated pyrite in the ground coal.

Exploration on the mechanism of enhancing low-rank coal ...


Sep 01, 2018· It is difficult to yield a high combustible matter recovery in the flotation of low rank coal with common oily collectors. This study focuses on the enhancement in flotation performance of low rank coal by combining diesel oil with didodecyldimethylammonium bromide (DDAB), as well as its corresponding intensifying mechanism.

Pyrite problems in the coal mining industry.


The presence of pyrite (FeS2) in coal can cause or contribute to several problems for the coal mining industry. These problems, which include spontaneous combustion, roof falls, floor heave, and accidental explosions in coal surface mining when ammonium nitrate-fuel oil (ANFO) explosives are used, result from pyrite oxidation.

The effect of particle size and pH on the removal of ...


The removal of 90% of the pyrite from coal by bacterial conditioning followed by oil agglomeration is attainable in Minto coal only if it is ball milled in the laboratory to an average particle size of about 5 μm. ... The mechanism of enhancement of pyrite rejection by bacteria such as E. coli is worth further study, at least from a ...


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