Preparation of MgO whisker from magnesite tailings and its application  

利用菱镁矿尾矿制备氧化镁晶须及其应用(英文)

作　　者：王楠[1] 陈敏[1] 李月圆[1] 倪红卫[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第9期2061-2065,共5页中国有色金属学报（英文版）

基　　金：Projects(50874130,50974034)supported by the National Natural Science Foundation of China;Project(FMRU2008K01)supported by the Open Research Fund of Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,China

摘　　要：Magnesium carbonate whisker as precursor was prepared from the low-grade magnesite tailings by the route of calcination, hydration, carbonation and thermal decomposition, and then MgO whisker was prepared by calcining the precursor. In addition, the effect of MgO whisker addition on sintering and thermal shock resistance of refractory was also investigated. The results show that the thermal decomposition product is MgCO3·3H2O and its morphology is remarkably influenced by the types of additives, and magnesium carbonate whisker with the length of 10-60 μm and length-diameter ratio of 10-20 is successfully prepared when a type of soluble magnesium salt is added. MgO whisker with the length of 10-40 μm is derived from precursor with the heating rate of 1 ℃/min. The thermal shock resistance of refractory is significantly improved by the addition of MgO whisker due to its effect on binding and preventing crack expanding, and the proper amount of whisker addition is around 3%.以菱镁矿尾矿为原料,通过原料煅烧、水化碳酸化、热解工艺制得碳酸镁晶须作为前驱体,再通过二次煅烧制备氧化镁晶须,并考察添加氧化镁晶须对氧化镁耐火材料烧结和抗热震性能的影响。结果表明:在重镁水热解过程中,添加剂种类对热解产物碳酸镁的形貌具有重要影响,当添加一种可溶性镁盐时,可获得长度10?60μm、长径比10?20的碳酸镁晶须;当升温速率为1°C/min时,前驱体可完整地转变为长度为10?40μm的氧化镁晶须;将氧化镁晶须添加至氧化镁耐火材料中,由于氧化镁晶须的钉扎作用而防止材料裂纹扩展,显著地提高了耐火材料的抗热震性,氧化镁晶须的适宜添加量为3%。

关 键 词：MgO whisker PRECURSOR magnesium carbonate whisker REFRACTORY thermal shock resistance 

分 类 号：TD926.4[矿业工程—选矿]