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The reduction behavior of low-grade lump hematite ore ( 20–50 mm) has been evaluated by performing a series of coal-based direct reduction roasting tests followed by magnetic separation under different process conditions such as roasting time, temperature, reductant type and dosage, and grinding stage. To investigate mineralogical transformation …


The Magnetic Fraction of Coal Fly Ash: Its Separation, Properties, and Utilization . M. J. MURTHA and G. BURNET . Ames Laboratory USDOE and Department of Chemical Engineering and Nuclear Engineering Iowa State University, Ames, Iowa 50011 A laboratory-size electromagnetic device has been built to separate the high-iron magnetic fraction from ...


Hence, there will be a secondary gradient magnetic chain, which can improve the desulphurization process through magnetic separation. Microwave energy and medium synergistic effects are able to readily improve the magnetic desulphurization process for fine coal.


Basic magnetic properties of bituminous coal Corrinne C. Alexander*, Arthur N. Thorpe*^ and Frank E. Senftle*t *U.S. Geological Survey, Reston, VA 22092, USA f Howard University, Washington, D.C. 20059, USA (Received 21 February 1979) Magnetic susceptibility and other static magnetic parameters have been measured on a number of bituminous coals ...


magnetic separation. Case studies Several case studies are presented that describe the testing and flowsheet development work that enabled proper magnetic separation technology selection and flowsheet configuration. Case Study 1: Dry magnetic separation of ilmenite before electrostatic separation The deposit for Case Study 1 was a typical aeolian


In this study, enrichment methods for coal fly ash (CFA) from Omsk thermal power station No. 4 (TPS-4) were investigated. The magnetite and unburned carbon concentrates were obtained by magnetic separation and flotation methods. The …


The failure of the induced roll magnetic separator to decrease the pyritic sulfur in coal freshly pulverized in a hammer mill, roll mill, and impact pulverization mill, indicates that these pulverizers do not increase the magnetic susceptibility of the pyrite particles to the magnitude necessary for magnetic separation.


Pyrite in fine coal was heated selectively by microwave energy to strengthen its magnetism in this study. Then, the inorganic sulfur in fine coal (−0.5 mm) was removed using a 2 T strong magnetic roller magnetic separator. The migrating regulation of organic sulfur-containing groups and harmful elements was analyzed by employing a microwave energy-intensive process.


Fly ash from three coal-burning power plants in Bulgaria: 'Maritza 3', 'Republika' and 'Rousse East' were subjected to wet low-intensity magnetic separation. The tests were performed at different combinations of magnetic field intensity, flow velocity and diameter of matrix elements. It was found th …


Abstract. Fly ash from three coal-burning power plants in Bulgaria: 'Maritza 3', 'Republika' and 'Rousse East' were subjected to wet low-intensity magnetic separation. The tests were performed at different combinations of magnetic field intensity, flow velocity and diameter of matrix elements.


Ferrohydrostatic separation of particles in magnetic fluids is a sink-float technique based on generalized Archimedes law whereby, in addition to the …


Magnetic separation has two major applications in mineral processing plants: The removal of tramp iron (which would deleteriously affect subsequent processes) from an ore stream. This is usually achieved by a low intensity …


improvements in this technology. In this paper, the application of a magnetic field around a dense medium cyclone has proven to increase the sharpness of separation within such a cyclone, and has also made it possible to make use of coarser media during the process. Thus, the coal cleaning process can be made more efficient with


IEA Coal Research, in The Problems of Sulphur, 1989. High gradient magnetic separation (HGMS) Conventional magnetic separators are largely confined to the separation or filtration of relatively large particles of strongly magnetic materials. They employ a single surface for separation or collection of magnetic particles.


In this study, enrichment methods for coal fly ash (CFA) from Omsk thermal power station No. 4 (TPS-4) were investigated. The magnetite and unburned carbon concentrates were obtained by magnetic ...


The coal-based reduction and magnetic separation is proposed, which adopts coal as the reductant to reduce the iron oxides to metallic iron below the melting temperature. The metallic iron particles aggregate and grow, and the particle size continuously increases to be suitable for magnetic separation. The optimization and application of coal ...


magnetic separation, thickening, leaching, electro-winning, solvent extraction, waste ... minerals, separation of mineral particles by va rious principles and a number of operations associated with them. However, most of the processes are basically physical (or ... In coal preparation wet processing is in preference to dry processing, wherever ...


XRD graphs of coal bottom ash separated by wet magnetic separation in 200gauss as a dif ferent particle size. 3.3. State of Ferr ous Material Burned in a …


The separation of fine pyrite from coal is difficult by conventional magnetic separation methods. The performance of magnetic separation in removing mineral pyrite from coal can be improved by increasing the magnetic susceptibility of pyrite. Several studies have shown that magnetic susceptibility of pyrite can be enhanced by heating .


The Magnetic Fraction of Coal Fly Ash: Its Separation, Properties, and Utilization M. J. MURTHA and G. BURNET Ames Laboratory USDOE and Department of Chemical Engineering and Nuclear Engineering Iowa State University, Ames, Iowa 50011 A laboratory-size electromagnetic device has been built to separate the high-iron magnetic fraction from coal ...


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Data is presented here comparing standard magnetic separation tests to results achieved when the coal is subjected to a caustic microwave leach pretreatment, prior to …


DENSIMETRIC SEPARATION OF COAL USING MAGNETIC FLUIDS J. SVOBODA* Advanced Technologies Worldwide, PO Box 73508, Fairland 2030, Johannesburg, South Africa (Received 22 June 2004; In final form 6 October 2004) Ferrohydrostatic separation of particles in magnetic fluids is a sink–float technique based on generalized


3.1. Effect of Coal Types on the Reduction Followed by Magnetic Separation of Briquettes The effect of coal type on the reduction followed by mag-netic separation of high-phosphorus oolitic hematite ore was investigated. The experiments were performed at conditions of roasting temperature 1 200°C, roasting time 40 min and C/O ratio 1.0.