Magnetic Separation Of Pyrite From Coals
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Magnetic Separation Of Pyrite From Coals
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Author : Sabri Ergun
language : en
Publisher:
Release Date : 1968
Magnetic Separation Of Pyrite From Coals written by Sabri Ergun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Coal categories.
Magnetic Separation Of Pyrite From Coals
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Author : Sabri Ergun
language : en
Publisher:
Release Date : 1968
Magnetic Separation Of Pyrite From Coals written by Sabri Ergun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
Magnetic Separation Of Pyrite From Coals
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Author : United States. Bureau of Mines
language : en
Publisher:
Release Date : 1971
Magnetic Separation Of Pyrite From Coals written by United States. Bureau of Mines and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
Progress Report On Removal Of Pyrite From Pulverized Coal By Induced Roll Magnetic Separator
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Author : Andrew J. Gaber
language : en
Publisher:
Release Date : 1969
Progress Report On Removal Of Pyrite From Pulverized Coal By Induced Roll Magnetic Separator written by Andrew J. Gaber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Coal preparation categories.
A Technical Performance Comparison Of Coal Pyrite Flotation And High Gradient Magnetic Separation
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Author :
language : en
Publisher:
Release Date : 1980
A Technical Performance Comparison Of Coal Pyrite Flotation And High Gradient Magnetic Separation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Surface Magnetic Enhancement For Coal Cleaning Final Report
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Author :
language : en
Publisher:
Release Date : 1992
Surface Magnetic Enhancement For Coal Cleaning Final Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The program consisted of a fundamental study to define the chemistry for the interactions between magnetic reagent and mineral and coal particles, a laboratory study to determine the applicability of this technology on coal cleaning, and a parameter study to evaluate the technical and economical feasibility of this technology for desulfurization and de-ashing under various processing schemes. Surface magnetic enhancement using magnetic reagent is a new technology developed at the Institute. This technology can be applied to separate pyrite and other minerals particles from coal with a magnetic separation after adsorbing magnetic reagent on the surface of pyrite and other minerals particles. Particles which have absorbed magnetic reagent are rendered magnetic. The adsorption can be controlled to yield selectivity. Thus, the separation of traditionally nonmagnetic materials with a magnetic separator can be achieved. Experiments have been performed to demonstrate the theoretical fundamentals and the applications of the technology. Adsorbability, adsorption mechanisms, and adsorption selectivity are included in the fundamental study. The effects of particle size, magnetic reagent dosage, solid contents, magnetic matrix, applied magnetic field strengths, retention times, and feed loading capacities are included in the application studies. Three coals, including Illinois No. 6, Lower Kittanning and Pocahontas seams, have been investigated. More than 90% pyritic sulfur and ash reductions have been achieved. Technical and economic feasibilities of this technology have been demonstrated in this study. Both are competitive to that of the froth flotation approach for coal cleaning.
Removing Pyrite From Coal By Dry Separation Methods
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Author : W. T. Abel
language : en
Publisher:
Release Date : 1973
Removing Pyrite From Coal By Dry Separation Methods written by W. T. Abel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Coal, Pulverized categories.
Surface Magnetic Enhancement For Coal Cleaning
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Author :
language : en
Publisher:
Release Date : 1992
Surface Magnetic Enhancement For Coal Cleaning written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The program consisted of a fundamental study to define the chemistry for the interactions between magnetic reagent and mineral and coal particles, a laboratory study to determine the applicability of this technology on coal cleaning, and a parameter study to evaluate the technical and economical feasibility of this technology for desulfurization and de-ashing under various processing schemes. Surface magnetic enhancement using magnetic reagent is a new technology developed at the Institute. This technology can be applied to separate pyrite and other minerals particles from coal with a magnetic separation after adsorbing magnetic reagent on the surface of pyrite and other minerals particles. Particles which have absorbed magnetic reagent are rendered magnetic. The adsorption can be controlled to yield selectivity. Thus, the separation of traditionally nonmagnetic materials with a magnetic separator can be achieved. Experiments have been performed to demonstrate the theoretical fundamentals and the applications of the technology. Adsorbability, adsorption mechanisms, and adsorption selectivity are included in the fundamental study. The effects of particle size, magnetic reagent dosage, solid contents, magnetic matrix, applied magnetic field strengths, retention times, and feed loading capacities are included in the application studies. Three coals, including Illinois No. 6, Lower Kittanning and Pocahontas seams, have been investigated. More than 90% pyritic sulfur and ash reductions have been achieved. Technical and economic feasibilities of this technology have been demonstrated in this study. Both are competitive to that of the froth flotation approach for coal cleaning.
The Selective Heating Of Pyrite In Coal Using Microwave Energy
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Author : Peter Wardle
language : en
Publisher:
Release Date : 2011
The Selective Heating Of Pyrite In Coal Using Microwave Energy written by Peter Wardle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The objective of this research project was to investigate the effect of microwave treatment on the conversion of pyrite in coal in order to enhance its magnetic properties and to aid subsequent desulphurisation by magnetic separation. Key areas of this investigation include:- a review of the fundamental theoretical aspects of heating in an applied microwave field, a detailed literature survey of the potential applications of microwave heating to aid coal desulphurisation, a study of the transformation mechanisms of pyrite by microwave and conventional heating methods, a comprehensive review of the influence of heterogeneity on the dielectric properties of coals and the effect of high power microwave heating on the decomposition of pyrite in a high sulphur coal. A detailed survey of the literature has shown that although a significant amount of work has been reported on the microwave heating of coal, little information is available which examines the mechanism through which different coals heat in an applied microwave field. A study is therefore presented in this thesis which quantifies, for the first time, the structural ordering of carbon in a range of coals of various ranks and the relationship with their dielectric properties. The results show a clear relationship between the structural ordering of carbon in coal and dielectric loss factor. Essentially, as the structural ordering increases, the level of free charge (per unit volume) increases together with electron mobility which results in an increase in dielectric loss factor. The transformation of pyrite to form the more magnetic pyrrhotite and other related decomposition products by conventional radiant heating has been the focus of much research. However, little attention has been given to the effect of microwave heating on the mechanisms of pyrite transformation in inert and oxygen-containing atmospheres. The study presented in this thesis investigates the effect of temperature, particle size and heat treatment time to establish how these affect the transformation process and the subsequent nature of the final product. This study showed that exposure of pyrite to both conventional and microwave heating methods enhanced its magnetic properties as a result phase alterations at the particle surface. Conventionally heated pyrite samples showed the highest magnetic susceptibility increases, speculated to be due difficulties surrounding the temperature control and measurement of the microwave heated samples. From a review of the literature in this field of research and by SEM observations made for each sample test in this work a general pyrite transformation model as a result of microwave exposure is proposed. The effect of microwave radiation on the conversion of in-situ coal derived pyrite was also investigated. The study presented here extends previous work by others by assessing quantitatively the influence of higher applied microwave power levels on the conversion of pyrite in coal. Samples of run-of-mine high pyritic sulphur content (~12%wt) Kentucky coal were microwave pre-treated at varying exposure times using 8kW and 15kW of microwave power operating at a frequency of 2.45GHz. This work included initial material characterisation which consisted of TGA, optical microscopy and dielectric property measurement, followed by SEM/EDAX characterisation of both microwave treated and untreated sample specimens. This is the first time that microwave treated coal, embedded in a carnauba wax mounting medium, has been observed by this method with focus on the thermal alterations of the pyrite phase. It was demonstrated that with sufficient power and residence time, the conversion of pyrite to the more magnetic pyrrhotite is achievable using microwave irradiation. The amount of pyrrhotite formed as a result of microwave exposure varies with microwave residence time and forward power level. Comparisons of change in the iron sulphide species in the coal was made between microwave treated and untreated material. Using a multimode microwave cavity it was found that significant amounts of pyrrhotite were formed in 20s when using 15kW of microwave power. Treatment at lower power levels in this type of cavity was found to be less effective. The overall effect of treatment on the coal proximate character was minimal.
Application Of Coal Petrography To The Evaluation Of Magnetically Separated Dry Crushed Coals
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Author :
language : en
Publisher:
Release Date : 1981
Application Of Coal Petrography To The Evaluation Of Magnetically Separated Dry Crushed Coals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
In the present study the open gradient magnetic separation method has been used to beneficiate the -30 + 100 mesh fraction of two high volatile bituminous coals. The evaluation of the effectiveness of the magnetic separation for cleaning these coals is the subject of this paper. Coal petrography in combination with scanning electron microscopy and x-ray diffractometry were used to characterize the magnetically separated coal fractions. These analyses revealed that the majority of the pyrite and non-pyrite minerals were concentrated in the positive magnetic susceptibility fractions. The bulk of the starting samples (approx. 80 weight percent) were located in the negative magnetic susceptibility fractions and showed significant reductions in pyrite and non-pyritic minerals. The magnetic separation appears to effectively split the samples into relatively clean coal and refuse.