不同类型钒钛球团矿矿相结构和冶金性能分析

Analysis of mineralogical structure and metallurgical properties of different types of vanadium titanium pellets

通过偏光显微镜和X射线衍射仪对中钛和高钛两种不同类型球团矿的矿相结构进行分析,并结合球团矿冶金性能测试,探讨钒钛球团矿的矿相结构对冶金性能的影响机理。结果表明:中钛球团矿主要矿物为钛磁铁矿、钛赤铁矿和钛磁赤铁矿,显微结构较均匀,矿物间胶结形成网状结构,使得其抗压强度达到3221N/P;高钛球团矿的抗压强度较差,只有2200N/P,原因是其存在分带结构,外部带以粒状钛赤铁矿为主,内部带以玻璃质胶结板状钛磁铁矿为主,同时过渡带存在裂隙和局部集中出现的气孔。中钦球团矿的还原度指数为87.75%,而高钛球团矿只有66.34%,这与中钛球团矿以高质量分数的钛赤铁矿和均匀分布的、多连通的、大气孔较多的气孔结构特征有关。

The mineralogical structure of medium titanium pellets and high titanium pellets are analyzed by polarizing microscope and X-ray diffractometer, and in combination with metallurgical performance test of pellets, the mechanism of influence of the mineralogical structure of vanadium-titanium pellets on their metallurgical properties is discussed.The results show that, the main minerals of medium titanium pellets are titanomagnetite, titanohematite and titanomaghemite, the microstructure is uniform and the reticulate structure is formed between minerals through bonding, which makes the compressive strength reach 3 221 N/P.The compressive strength of high titanium pellets is only 2200N/P,the reason is the existence of zonal structure. The outer zone is of mainly granular titanium hematite and the inner zone is dominated by vitreous cemented (bonded)tabular titanomagnetite, meanwhile, cracks and locally concentrated pores exist in the transition zone. The reduction index of medium titanium pellets is 87.15%, while that of high titanium pellets is only 66.34%,which is related to the characteristics of medium titanium hematite with high mass fraction and pores with uniform distribution, multiple connections and more large pores.