Abstract:Magnetic roasting in shaft furnace is an effective method to dispose refractory red iron ore. A more scientific and efficient shaft furnace magnetic roasting theory is put forward through the experimental research on haft furnace magnetic roasting of weakly magnetic lump iron ore. And based on the existing Anshan- type shaft furnace, shaft furnace magnetic roasting process is optimized via controlling reducing atmosphere efficiently. The results show that the maximum effectiveness of magnetic roasting is obtained under the condition that the content of hydrogen reduction gas increases to 12%±1%, the CO content decreases and the magnetic roasting reduction temperature rises. And by independently setting the reduction gas and heating gas system in the process of magnetic roasting, the flexible adjustment for reducing gas components, flow rate and pressure is achieved. Decreasing the amount of reduction gas to reduce the gas for reduction of ore to 1400- 1600m3/h can lower the production cost of shaft furnace. The independent reduction gas system can increase coke oven gas proportion of reduction gas and keep the H2 content and the magnetic susceptibility to 12%±1% and to 2.33 respectively, which can decrease gas reduction and improve the quality of ore magnetic roasting. At the same time, the export area of gas jet tower will be decreased by 50% in order to keep the stable gas pressure stability and the uniformity of the gas burner. In this way can the ore be reduced fully and evenly.
张志刚. 块状铁矿石竖炉磁化焙烧的工艺优化[J]. 中国冶金, 2015, 25(09): 11-14.
ZHANG Zhi- gang. Process optimization on magnetic roasting of lump iron ore in shaft furnace. China Metallurgy, 2015, 25(09): 11-14.