摘要:
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。
Abstract:
Vanadium and titanium iron concentrate pellets conaining carbon after drying,750℃ and 1 000℃ roasting had been used to investigate phase,microstructure,composition and intensity change under low temperature calcination by means of XRD,SEM/EDS,chemical analysis and strength testing.The results show that the vanadium and titanium iron ore concentrate,pulverized coal,water,and com-posite binder mix in accordance with the mass ratio of 100:9:9:1.0,the resulted dry pellets strength is significantly higher than wet pellets.While main phase of pellet roasted at 750℃ show no observed difference with that of dry pellet,but XRD result indicate increasing Fe3O4 peak intensity.The gap be-tween the mineral powder particles increases and strength of pellets dramastically decreases.Roasting temperature of 1 000℃ generates main phase of pellet composing of Fe2TiO4 and reduced iron,and cau-ses pellets shrinkage and thus strength increase.
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