HIsarna process for iron making Jun28

HIsarna process for iron making...

HIsarna process for ironmaking HIsarna process is a smelting reduction process for producing liquid iron directly from iron ore fines (IOF) and coal. It represents a new, potentially more efficient way of making iron and is being developed for substantial reduction of carbon emissions from the ironmaking process. It is an initiative of ULCOS (ultra low CO2 steelmaking) consortium of European steelmakers and is a combination of HIsmelt technology of Rio Tinto and Isarna technology developed at Tata Ijmuiden. It eliminates prior processing of raw materials as needed by the blast furnace process. The process consists of pre-reduction of IOF in cyclone converter furnace (CCF) of Isarna technology and bath smelting of iron in smelting reduction vessel (SRV) of HIsmelt process. The process name derives by combining the names of the two technologies (‘HI’ from HIsmelt and ‘sarna’ from Isarna, a celtic word for iron). First attempt of applying cyclone technology for the reduction of iron ore was attempted at Koninklijke, Hoogovens in 1960s but was abandoned. Another serious attempt was made in 1986 but because of economic crisis, the project was put on hold until early 1990s. The project was revived when coke supply became scarce during mid 1990s. CCF technology was then developed at a pilot scale with capacities of 15-20 tons per hour (tph) of ore feed. The attempt was again halted in 1999 because of successful implementation of pulverized coal injections in the blast furnaces. HIsmelt was originally started by CRA (now Rio Tinto) in 1980s in a 2 tph pilot plant at Maxhutte, Germany followed by 8 tph pilot plant in Kwinana, Western Australia in the 1990s. Later in the first decade of present century, a commercial plant of 80 tph (60,000 tons per annum) was commissioned and operated at...