高镁球团焙烧特性及其固结强化机理  

Roasting characteristics of magnesium pellets and mechanism of strengthening concretion

作　　者：范晓慧[1] 谢路奔[1] 甘敏[1] 陈许玲[1] 袁礼顺[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第2期449-455,共7页Journal of Central South University:Science and Technology

基　　金：教育部新世纪优秀人才支持计划基金资助项目(NCET-05-0630);湖南省研究生学位论文创新资助项目(1343/74333001114);中南大学优秀博士学位论文扶植项目(2010ybfz058);国家自然科学基金与上海宝钢集团公司"钢铁联合研究基金"资助项目(51174253)

摘　　要：分别以蛇纹石、MgO粉和菱镁石作为含镁添加剂,研究高镁球团的焙烧特性。研究结果表明：随着球团中MgO质量分数的增加,磁铁矿球团和赤铁矿球团的预热球和焙烧球强度都降低,表明MgO质量分数的提高不利于球团的固结;通过添加含钙和含硼物质,改善了高镁球团的预热球和焙烧球强度;随着球团矿碱度的提高,球团矿预热球和焙烧球强度都是先升高后降低,碱度为0.4-0.5时达到最大值,而随着球团硼质量分数的增加,球团预热球和焙烧球强度都升高;添加含钙和含硼物质可促进低熔点物质的形成,使球团产生适宜的液相量,加快Mg2＋和Fe3＋的扩散,促进含镁熔剂的矿化和Fe2O3再结晶,从而改善含镁球团的固结强度。The roasting characteristics of magnesium pellets were studied. The results show that the mechanical strength of preheated and roasted pellets of magnetite pellets and hemetite pellets decrease as MgO content increases by adding serpentine, MgO powder and magnesite, which indicates that MgO content goes against the concretion strength of pellets. Adding calcium-containing and boron-containing materials can increase the strength of magnesium pellets. The strength of preheated and roasted pellets increases at first, and then decreases as the basicity increases, and reaches the maximum when basicity is 0.4-0.5. The strength increases as the boron content increases. The liquid generated by adding calcium-containing or boron-containing materials can improve the spread of Mg2＋ and Fe3＋, which is beneficial for magnesium additive mineralization and hematite recrystallization, and then improve the strength of magnesium pellets.

关 键 词：含镁球团 焙烧 离子扩散 强度 晶粒 

分 类 号：TF046[冶金工程—冶金物理化学]