Desulfurization and Deashing of Solvent Refined Coal (SRC-I) by High Gradient Magnetic Separation Techniques

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Abstract
A pilot-scale high gradient magnetic separations (HGMS) system was assembled to investigate the magnetic separation of ash-forming solids and inorganic sulfur from liquefied coal. The liquefied coal studied was a diluted intermediate product obtained from the DOE-sponsored Tacoma SRC-I pilot plant (50 t/d coal capacity). The magnetic characteristics and particle size distribution of the Tacoma SRC-I liquefied coal were optimized for removal by HGMS. The effect of the following magnetic separator parameters upon the deashing the desulfurization of the diluted liquefied coal was considered: matrix packing density, temperature, applied magnetic field, dilution of and residence time of liquefied coal feed, backflushing of saturated separator parameters upon the deashing and desulfurization of the diluted liquefied model which satisfactorily accounts for HGMS performance was developed. The HGMS system was observed to remove over 90% of the ash-forming materials and inorganic sulfur over a wide range of operating conditions. These removals were increased to 97 and 95%, respectively, with residence times greater than 6 min.