FASTMET and FASTMELT Processes of Ironmaking Nov15

FASTMET and FASTMELT Processes of Ironmaking...

FASTMET and FASTMELT Processes of Ironmaking Kobe Steel in collaboration with Midrex Technologies, Inc., a subsidiary of Kobe Steel in the USA, has developed the FASTMET process which is a coal based direct reduction process of iron making. The FASTMET process converts iron ore pellet feed, iron ore fines and/or metallurgical waste from the steel plant into direct reduced iron (DRI) using pulverized non coking coal as a reductant. The process uses a rotary hearth furnace (RHF) for the reduction reaction (Fig 1). The end product DRI can be hot briquetted (HBI), discharged as hot DRI into transfer containers, or cooled if cold DRI is needed. FASTMELT process is the FASTMET process with addition of an Electric Iron Melting Furnace (EIF) to produce liquid iron or hot metal. Hot DRI is directly discharged from the RHF into EIF and is melted to produce hot metal. Fig 2  A simplified cross section and plan view of a RHF The first commercial FASTMET plant was commissioned in April 2000 at Nippon Steel’s Hirohata works. A total of 5 plants have since been commissioned. The details of these plants are given in Table 1. Tab 1 FASTMET commercial plants Unit NSC Hirohata no. 1 NSC Hirohata no. 1 NSC Hirohata no. 1 JFE Fukuyama KSL Kakogawa RHF feed rate ton/Yr 190,000 190,000 190,000 190,000 16,000 Raw materials BOF dust BOF dust BOF dust BF dust, BOF dust BF dust, BOF dust, EAF dust Product application BOF feed, DRI BOF feed, DRI BOF feed, HBI BOF feed, DRI  BF & BOF feed, DRI It can be seen that this process is being presently used for utilization of the metallurgical waste of the steel plant. Besides metallurgical waste the process can also use iron ore fines having size which...