ITmk 3 Process of making Iron Nuggets Feb17

ITmk 3 Process of making Iron Nuggets...

ITmk 3 Process of making Iron Nuggets  ITmk3 process is also known as Iron making Technologies mark 3 and is based on coal reduction technologies. IT mark 1 is the iron making process by blast furnace while the IT mark 2 is the iron making by direct reduction mostly by gas based reduction processes (Fig 1).       Fig 1 – Iron making Technologies  Development history  The laboratory testing of the process was carried out during 1996 to 1998. During the period 1999 to 2000 a small pilot plant of capacity 3,000 tons per year was constructed and operated at Kakogawa Works of Kobe Steel, Japan. In the years 2002 to 2004 a pilot demonstration plant of 25,000 tons per year was constructed and operated at Minnesota, USA. The construction of first commercial plant of capacity 500,000 tons per year started at Hoyt Lakes Minnesota in 2007 and the operation in this plant started in January 2010.   The Process This process has been developed by Kobe Steel and is environmental friendly. In this process, self reducing–fluxing dried green balls are reduced, carburized and smelted. The self reducing fluxing dried green balls are produced by agglomeration of iron ore fines, limestone as flux, bentonite as binder and boiler coal a reducing – carburizing agent. The process on Iron Carbon phase diagram is shown in Fig 2. Fig 2 – ITmk 3 process on Iron- Carbon phase Diagram           ITmk3 process produces high purity granular iron (Iron nuggets by using iron ore fines and non coking coal. The process is distinctive with reduction, carburizing melting and slag separation (Fig 3). The process occurs at lower temperatures (Around 1350 Deg C) and hence different from conventional iron making by blast furnace....