论文部分内容阅读
低温还原粉化率RDI-3.15是评价烧结矿质量的一项重要指标,它会影响高炉焦比和产量。钒钛烧结矿的RDI-3.15高达60%以上,研究认为钙钛矿是造成RDI-3.15高的主要原因,但是随着钒钛烧结矿中钙钛矿含量的大幅降低,其低温还原粉化性能并未得到有效改善。本研究应用矿相分析法对比分析了普通烧结矿和钒钛烧结矿的微观结构差别,并观察了两种烧结矿在低温还原粉化前后的结构变化;发现骸晶状赤铁矿和气孔结构是发生粉化的主要区域,而钒钛烧结矿中存在大量的气孔结构,这是导致其还原后发生严重粉化的主要原因。调整成分以提高粘结相的流动性,有利于降低气孔率和骸晶状赤铁矿含量,并增加有效粘结相,从而可减少配碳量并降低烧结温度,限制铁酸钙的分解和钙钛矿等高熔点矿物的生成,增加强度较好的交织结构的数量。
RDI-3.15 is an important index to evaluate the quality of sinter. It affects the coke ratio and output of blast furnace. The RDI-3.15 of vanadium-titanium sinter is as high as 60% or more. It is considered that perovskite is the main cause of RDI-3.15 high. However, as the content of perovskite in vanadium-titanium sinter decreases drastically, the low-temperature reduction pulverization Did not get effective improvement. In this study, the microstructure differences between ordinary sinter and vanadium-titanium sinter were analyzed by the method of mineralogical analysis, and the structural changes of the two sinters before and after low-temperature reduction pulverization were observed. It was found that the skeletal hematite and stomatal structure Is the main area of the occurrence of chalking, and vanadium-titanium sinter there is a large number of stomatal structure, which led to the main reason for the occurrence of severe chalking. Adjusting the components to improve the fluidity of the binder phase is beneficial for reducing the porosity and the skeletal hematite content and for increasing the effective binder phase so that the carbon content can be reduced and the sintering temperature can be reduced to limit the decomposition of calcium ferrite Perovskite and other high melting point mineral generation, increasing the strength of the number of interwoven structure better.