Separation of Dry Crushed Coals by High-Gradient Magnetic Separation

摘要

The separation of pyritic sulfur and ash-forming minerals from dry crushed coal by means of a high-gradient magnetic separator was demonstrated, and the process parameters for separation were defined. Variables for the parametric test series included several grinds of two coals, particle size fractions, magnetic field strength, matrix, and transport fluid, direction, and velocity. Grinding and classifying equipment and techniques were evaluated. For several size fractions of both coals, all of the liberated pyritic sulfur and most of the liberated ash-forming minerals were separated. For the remaining size fractions, encouraging results were obtained. A preliminary flow sheet and cost estimate indicated that the capital and operating costs for classifying and separating 200 tons/hr range from $1.07 to $1.64 per ton of feed coal. (ERA citation 05:002455)