USE OF HIGH PERCENTAGE DRI IN EAF AND THE LATEST TECHNOLOGIES ADOPTED TO IMPROVE PRODUCTIVITY AND COST REDUCTION

摘要

A^A DRI production process was first pioneered in 1955. The early process required 5-10 years of pilot operation before satisfactory commercial operation was achieved. Proven technologies are now available to produce DRI or HBI from either fines or lump iron ore, using either gas or coal as a reductant. Shafts, kilns, rotary hearths and fluidized beds are the various types of reactor vessels employed to reduce the ore to metallized iron. The first commercial plant operated in 1957 in Monterrey in Mexico to make DRI with 1 million tons per annum capacity using fixed bed reactors. The continuous charging of DRI pellets into EAF demonstrated at the Edmonton Works of Stelco in Canada during 1963-1966. The development of MIDREX process in commercial size carried out at plant Portland, Oregon in 1969 to make DRI. Since then there have been tremendous developments to use DRI in Electric Arc Furnaces to improve the productivity and reduction in production cost. Also the use of DRI has been increased due to several negative scrap factors such as price, quality and availability.