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将钒钛铁精矿内配碳球团分别进行干燥、750℃和1 000℃焙烧,采用XRD、SEM/EDS、化学分析及强度测试方法,研究了球团在低温焙烧条件下的物相、微观形貌、成分及强度的变化。结果表明:钒钛铁精矿粉、煤粉、水和复合黏结剂按照质量比100∶9∶9∶1.0混合压球,干球团强度较湿球团强度有明显提高;750℃焙烧球团与干球的主要物相差别不大,但Fe3O4衍射峰强度增加,矿粉颗粒空隙增大,球团强度急剧下降;1 000℃焙烧球团主要物相为钛铁晶石(Fe2TiO4)和还原铁,球团收缩,强度增大。
The carbon spheres in the vanadium-titanium-iron concentrate were dried and calcined at 750 ℃ and 1000 ℃ respectively. The phases of the pellets under low temperature calcination were studied by XRD, SEM / EDS, chemical analysis and strength test. Micro topography, composition and intensity changes. The results show that the strength of the dry pellets is obviously higher than that of the wet pellets; the pellets of vanadium-titanium-iron concentrate, pulverized coal, water and the composite binder are mixed according to the mass ratio of 100: 9: 9: 1.0, The main phase of the pellets was 1 000 ℃, and the main phase of the pellets was Fe2TiO4 and reduced Iron, pellets shrink, strength increases.