材料期刊网

东鞍山浮选赤铁精矿制成的低碱度球团矿,在高炉试用中,于炉身料线下6.55m部位沿径向取样,进行岩相观察,发现全部样品都已参加了间接还原反应.还原性气体通过样品孔隙与液、固相物质作用,球团矿以其微细气孔结构较烧结矿效果更明显.球团矿因在炉中的不同部位,不同反应程度呈现六种类型同心层状结构.铁氧化物由硅酸盐熔体胶结,熔体成分以CaO-Al_2O_3-SiO_2系为主,也有CaO-FeO-SiO_2系,并明显见到CaO-Fe_2O_3系化合物的磁铁矿化现象.

Samples of low basicity hematite pellets made from East-Anshen iron ore con-centrate and charged a 100m~3 experimental blast furnace have been taken fromfive equalized points along diameter of furnace shaft at 6.5m below the burdenline during processing. A petrographic observation on mineralogical reactionsof the samples has been made in comparison with the industrial fluxed sinters sam-pled in the same manner. It was shown that the indirect reducing reaction oc-curs under temperatures above that of the pellet firing in all samples. The reduc-ing gases of the furnace atmosphere penetrate through the pores and gaps of thepellet and react with its liquid and solid phase substances. The behaviour of thereducing reaction in the pellets appears to be better than that of sinters owingto their different micro-porous structures. Since the pellets flow downward alongindividual path with various courses of reaction, six typical models of concentriclayer structure of them would be proposed. The iron oxides matx is bonded es-sentially by molten silicates of CaO-Al_2O_3-SiO_2 system formed at high tempera-ture and by other systems, e.g. CaO-FeO-SiO_2, etc. as well. The magnetizingphenomena of CaO-Fe_2O_3 system has also been obviously observed.