CAJ | 학술논문

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℃/min时,前驱体可完整地转变为长度为10-40 μm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％.
이릉미광미광위원료,통과원료단소、수화탄산화、열해공예제득탄산미정수작위전구체,재통과이차단소제비양화미정수,병고찰첨가양화미정수대양화미내화재료소결화항열진성능적영향.결과표명:재중미수열해과정중,첨가제충류대열해산물탄산미적형모구유중요영향,당첨가일충가용성미염시,가획득장도10-60μm、장경비10-20적탄산미정수；당승온속솔위1℃/min시,전구체가완정지전변위장도위10-40 μm적양화미정수；장양화미정수첨가지양화미내화재료중,유우양화미정수적정찰작용이방지재료렬문확전,현저지제고료내화재료적항열진성,양화미정수적괄의첨가량위3％.
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 MgCO33·H20 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％.