Abstract: This paper studied the changing principles of carbon content in direct reduction iron (DIR) and liquid iron in the COREX melting gasifier.Under the normal working conditions of experimental equipment,liquid nitrogen was poured into the meling gasifier from its tuyere to cool down quickly.And then seven cross sections were made to study the carburization reaction and its characteristics of the solid iron and the liquid iron,and also the reaction of carbon between the slag and the metal.According to the results,the influences of the thickness of the semi-coke layer and the temperuture on the carbon content of liquid iron in the COREX meltion gasifier were confirmed.

Key words: melting gasifier, direct reduction iron (DRI), liquid iron,