Name : The 46th Conference of Coal Science
Number : 46
Location : [in Japanese]
Date : November 26, 2009 - November 27, 2009
Pages 6-7
Temperature-programmed pyrolysis of low rank coals physically mixed with goethite-rich limonite ore has been studied with a fixed bed quartz reactor for the purpose of developing a novel co-processing method of the removal of coal-bound nitrogen and the reduction of goethite. The limonite at 5-30 mass% loading promotes the formation of N_2 from brown coal at 900℃ and the consequent nitrogen removal, though the effect levels off beyond 10 mass% and thus seems to be limited. The XRD measurements after pyrolysis show that goethite can readily be reduced α-Fe, irrespective of limonite loading, and part α-Fe reacts with a small amount of carbon to form a solid solution. This method may have the potential for the simultaneous production of low nitrogen chars and reduced iron materials by utilizing low-valued coals and limonite ores.
