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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%。
Magnesite tailings are used as raw materials, and magnesium carbonate whiskers are prepared by raw material calcination, hydration carbonation and pyrolysis process as precursors, then magnesium oxide whiskers are prepared through secondary calcination, and the addition of magnesium oxide whiskers Effect of Magnesia Refractory Sintering and Thermal Shock Resistance. The results showed that the additive species had an important influence on the morphology of the pyrolytic magnesium carbonate during the pyrolysis of heavy magnesium water. When a soluble magnesium salt was added, the length of 10-60 μm and the aspect ratio of 10-20 Magnesium carbonate whisker; when the heating rate of 1 ° C / min, the precursor can be completely converted into a length of 10? 40μm of magnesium oxide whiskers; the magnesium oxide whisker added to the magnesia refractories, as magnesium oxide Whisker pinning effect to prevent the material crack growth, significantly improve the refractory thermal shock resistance, magnesium oxide whiskers suitable dosage of 3%.