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A Fundamental Investigation on Flue Gas Circulation Sintering

Author: FanZhenYu
Tutor: JiangTao
School: Central South University
Course: Mineral Processing Engineering
Keywords: Iron ore Sintering Sintering flue gas Flue gas circulating Desulfurization
CLC: TF046.4
Type: Master's thesis
Year: 2011
Downloads: 49
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Abstract


China's iron and steel industry in recent years, the rapid development of the resulting environmental issues are increasingly significant, especially SO 2 gt; the CO 2 emissions on atmospheric pollution has attracted wide attention. The main source of the iron and steel industry to produce SO2 for the sintering process. Sintering flue gas desulfurization process equipment investment, higher operating costs and less efficient desulfurization byproduct complex as well as technical higher risk characteristics, these are restricting the development of sintering flue gas desulfurization, and the slow development of the sintering flue gas desulphurization technology . Flue gas circulating sintering process is a sintering cycle trolley after the return part of the flue gas discharged by the sintering process igniter sealed cover. The new technology at the same time reducing the sintering total emission of SO2 in the sintering flue gas enrichment, sintering flue gas SO2 concentration, which can reduce the cost of subsequent desulfurization process. In this paper, artificial gas distribution simulated sintering flue gas, principle and technical parameters of the sintering process of flue gas circulating system. Flue gas circulating sintering technology research: reducing cycle flue gas O2 content will lead to the sintering the production quality indicators significantly worse, should control the circulation in the flue gas oxygen content on the entire sintering cycle flue gas CO gas in more than 18%; favorable process, in which the latent heat can be utilized, leading to improved sinter quality; cycle of SO2 in the flue gas has little effect on the yield and quality of the sinter indicators, but when SO2 is greater than 1000ppm, S finished sinter significant enrichment. On the whole, the use of flue gas circulating sintering process, the vast majority of SO2 into the sintering flue gas enriched and emissions control production conditions, can be prepared by the excellent quality blast furnace. Cycle flue gas oxygen content studies show that the performance of several iron ore mineralization: variation was first increases and then decreases as the calcination temperature, the formation of several iron ore of iron, calcium, hematite , limonite maximum amount of calcium ferrite formation temperature of 1275 ℃, specularite and magnetite to 1250 ° C, 73.14% calcium ferrite generation hematite, specularite 67.47% limonite was 97.13%, 62.88% magnetite; the roasting airstream oxygen content similar to the impact of different ore roasting calcium ferrite, generally presented as the oxygen content increases, the generation amount of the calcium ferrite gradually increasing trend . Overall, the oxygen content of the size of the performance of sintered iron ore mineralization: magnetite gt; hematite gt; specularite gt; limonite. Of SO2 in the flue gas during the sintering process behavior shows that: 1) improve the sintering maximum temperature to reduce the residual S content in clumps; 2) to increase circulation in the flue gas SO2 content and improve clumps alkalinity will lead to SO2 in sinter occurred in enrichment; 3) sinter layer strong absorption of SO2 in the gas stream, sintering wet with CaO and water is caused by the absorption of the main factors; 4) SO2 desorption mainly occurs in the dry zone sulfite decomposition and the decomposition of sulfates in the combustion zone.

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CLC: > Industrial Technology > Metallurgical Industry > General issues > Smelting of raw materials and ore pretreatment > Ore pretreatment, sintered pellets > Sintering
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