Influence of Mineral Structure of Vanadium-titanium Sinter on its Metallurgical Properties
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摘要: 采用偏光显微镜对中钛和高钛两种不同钛含量的烧结矿矿相结构进行定量研究。结果表明:两种烧结矿金属相主要以钛赤铁矿和钛磁铁矿为主;黏结相均为铁酸钙、硅酸二钙和玻璃质;不同之处在于高钛型烧结矿中出现了钙钛矿。钙钛矿的出现不仅削弱了铁氧化物的连晶作用,还减少了黏结相的生成,致使高钛型烧结矿的低温还原粉化恶化;而中钛型烧结矿由于钛赤铁矿的大量存在,还原性优于高钛型烧结矿;当两种钒钛烧结矿整体结构都表现为均匀时,其结构种类决定了强度的好坏,以交织熔蚀结构为主的中钛型烧结矿转鼓强度要高于以粒状结构为主的高钛型烧结矿。Abstract: The mineral structure of sinter with medium and high titanium content was studied quantitatively by means of polarization microscope.Observations indicates that titanium hematite and titanomagnetite are the main metallic phases in this two sinter,and the binder phases are calcium ferrite,dicalcium silicate and glassy.And perovskite appears in high titanium sinter.The presence of perovskite not only weakens the continuous crystal effect of iron oxide,but also reduces fraction of the binder phase,which results in low temperature reduction degradation of high titanium sinter.Medium titanium sinter has larger amount of titanium hematite than high titanium sinter,therefore it has better reducibility.When the whole structure of sinter is uniform,its structure type determines the strength.The drum strength of medium titanium type sinter with interwoven structure is higher than that of high titanium type sinter with granular structure.It is suggested that the sintering atmosphere should be controlled reasonably and the formation of good structure should be ensured in order to reduce the negative effect of perovskite.
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Key words:
- vanadium-titanium sinter /
- perovskite /
- mineral structure /
- metallurgical properties
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