Physical Coal Cleaning Of Midwestern Coals By Open-gradient Magnetic Separation

Open-Gradient Magnetic Separation (OGMS) using superconducting quadrupole magnets offers a novel beneficiation techology for removing pyritic sulfur from pulverized dry coal. It is estimated to have a power demand 75% lower than techniques using conventional electro-magnets, while achieving higher separation forces. Additionally, the system operates in a continuous inode and uses no chemicals. Because OGMS is specifically applicable to finely ground coal (120-325 mesh), its development could encourage the commercialization of other unconventional coal technologies, such as coal-water slurries, fluidized-bed combustion, and synfuels.