摘要:
研究了分流制粒烧结中酸性物料的粒度、配碳量和碱度等工艺参数对烧结矿微观结构的影响。结果表明,酸性物料的粒度范围扩大时,料层透气性变好,铁酸钙增多,矿相结构更均匀。当碱度较低时,烧结矿黏结相以硅酸二钙和玻璃质为主;随着碱度升高,钙钛矿含量先增加后减少,当碱度达到2.02时,铁酸钙含量大量增加,黏结相以铁酸钙和玻璃质为主。随着配碳量的增加,铁酸钙含量降低,钙钛矿含量增加,赤铁矿含量减少,亚铁含量增多,将使得烧结矿的转鼓强度和还原粉化指数提高,还原性下降。综合考虑分流制粒钒钛矿烧结配碳量选择4.2%比较适宜。
Abstract:
In this paper the impact of process parameters such as acidic material sintered grain size,carbon ration and alkalinity on the microstructure of shunt granulation sintered ore had been studied. It was found out that when particle size range of acidic materials expanded,material layer permeability improved,calcium ferrite content increased and mineral phase structure became more uniform. At lower alkalinity,sinter bonding phase was dominated by calcium silicate and glassiness. As alkalinity increased,perovskite content increased to a peak level and then decreases. When alkalinity reached to 2.02,calcium ferrite content increased greatly and bonding phase were mainly calcium ferrite and glassiness. With the increase of carbon ratio,calcium ferrite and hematite contents decreased,while perovskite and ferrous contents increased,which caused the increase of the drum strength of sinter and RDI index,and drop of reducing ability. Based on the research results the suitable carbon ration was chosen at 4.2% for shunt granulating process.
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