| 摘要 |
<p>PURPOSE:To economically manufactre hot iron without using a blast furnace by melting and reduxing reduced iron pellets, in a melt-reduction furnace using a burner flame as the main heat source, in which more than 12% of Fe contained is left in the form of its oxide. CONSTITUTION:Iron oxide pellets 4 made of lumpy iron ore, fine iron ore dust, etc. are charged into rotary kiln 3 and brought into countercurrent contact with a hot reducing gas from melt-reducing furnace 5 connected to the end of kiln 3. Thus, pellets 4 are subjected to solid phase reduciton with the gas and fed to furnace 5 while leaving more than 12% of Fe contained in the form of its oxide. In furnace 5, fuel such as heavy oil, natural gas or dust coal is burned by burner 9 with pure oxygen. At the same time, a reducing agent such as coke is added and the amt. of oxygen supplied from burner 9 is controlled, thereby economically manufacturing hot iron without over-reduction.</p> |
