摘要
以轻烧白云灰粉料为原料，采用常压碳化法，在重镁水热解时加入聚乙二醇，制备出不同形貌的氧化镁。考察了聚乙二醇的用量和热解温度对氧化镁形貌和尺寸的影响，探讨了其形成机理。结果表明：聚乙二醇用量为30％（体积分数）时，氧化镁颗粒分散性最好，颗粒粒径主要分布在2～4μm。热解温度从40～95℃时，未添加聚乙二醇的氧化镁形貌由棒状变为花朵状，最后变为规则的球状，其中，棒状氧化镁的长度约为25μm，直径约为5μm，球状氧化镁的直径约为25μm；添加了聚乙二醇后，氧化镁形貌由棒状变为无规则片状，其中，棒状氧化镁长度约为15μm，直径约为2．5μm，片状氧化镁的厚度约为30nm，说明聚乙二醇能够抑制氧化镁晶体的生长。
With the light-burned dolomite powder as raw material, the different morphology of magnesia was prepared by adding polyethylene glycol to magnesium bicarbonate solutions. The influences of dispersant dosage and pyrogenation temperature on the morphology and size of magnesia crystal were studied, and the mechanism of morphology formation was also illuminated. The results show that when the dosage of polyethylene glycol was 30%, the size distribution of magnesia particles was smal- lest. Magnesium bicarbonate solutions were heated from 40 ℃ to 95 ℃, the morphology of magnesia changed from rod-like to spherical. The length of rod-like magnesia is about 25 μm, the section diameter is about 5μm, and the diameter of spherical magnesia is about 25 μm. After adding polyethylene glycol, the morphology of magnesia changed from rod-like to flaky, and the length of rod-like magnesia is about 15μm, the section diameter is about 2.5μm.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2014年第1期11-16,共6页
Journal of The Chinese Ceramic Society
关键词
轻烧白云灰
氧化镁形貌
聚乙二醇
碳化法
light-burned dolomite powder
magnesia morphology
polyethylene glycol
carbonation
