论文部分内容阅读
以不同预还原度的块矿及块矿与烧结矿的混合矿为研究对象,利用单颗粒荷重软化试验装置,考察了氧气高炉及传统高炉还原气氛对块矿及混合炉料软熔性能的影响。研究发现,高还原势的氧气高炉条件下,含铁炉料还原度的提高导致其颗粒内部铁相数量增加,低熔点渣相数量减少,块矿的软熔性能与传统高炉条件相比有所改善。同时,通过对软熔过程相关数据及炉料颗粒微观结构的分析,发现氧气高炉条件下,块矿-烧结矿混合炉料在界面上发生了交互作用;由于铁相数量的增加及渣相的减少,不同渣相的接触时间被推迟,接触的渣量也减少,导致相对于传统高炉条件,氧气高炉条件下发生交互作用的温度升高,其作用强度减弱。
Taking the different prereduced lump ore and the mixed ore of lump ore and sinter as the research object, the effect of reducing atmosphere of oxygen blast furnace and traditional blast furnace on the reflow properties of lump ore and mixed charge was investigated by using the single grain softening test device. The results show that under the condition of high reduction potential oxygen blast furnace, the reduction of iron-bearing charge increases the number of iron phases in the particles and reduces the amount of low-melting slag phase. The reflow performance of lump ore is improved compared with that of conventional blast furnace . At the same time, through the analysis of the relevant data of the reflow process and the microstructure of the charge particles, it is found that the interaction between the lump ore and the sinter ore mixture occurs at the oxygen blast furnace. Due to the increase of the amount of iron phase and the decrease of slag phase, The contact time of different slag phases is postponed and the amount of slag contacting is also reduced, resulting in an increase in the temperature at which the oxygen blast furnace conditions interact with the conventional blast furnace conditions, and their intensity of action decreases.