In spite of the advantages of CaO refractories, such as high refractoriness, potential to produce pure steel molten, and high alkaline corrosion resistance, their application has been limited due to its poor hydration resistance. Introducing additives to improve the hydration resistance of lime is a novel method. The influences of Mg(OH)₂ and sintering temperatures on the sintering and hydration resistance of CaO aggregates that were produced by thermal decomposition were investigated in this paper. The purpose of this work was to produce high-purity CaO raw material with high density, low porosity, well grain growth, and good hydration resistance economically. The sintered samples were characterized by bulk density, apparent porosity, surface appearance, and microstructure. The results indicated that (1) Mg(OH)₂ promoted the grain growth of CaO, reduced the apparent porosity, and improved the density of the specimens. The hydration resistance of the samples was increased. (2) Increasing the sintering temperature improved the hydration resistance of the specimens obviously in the experiment. (3) Grain size of CaO was more uniform with the increment of Mg(OH)₂ content, and the density of the compacts was improved.

中文翻译：

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Mg（OH）2和烧结温度对CaO骨料热分解抗水化性能的影响

尽管CaO耐火材料具有高耐火度，生产纯钢水的潜力和高耐碱性腐蚀等优点，但由于其耐水合性差，其应用受到了限制。引入添加剂以改善石灰的抗水合作用是一种新方法。Mg（OH）_2的影响研究了烧结温度对热分解制备的CaO骨料的耐水合性的影响。这项工作的目的是经济地生产高密度，低孔隙率，良好的晶粒生长和良好的耐水合性的高纯度CaO原料。烧结样品的特征在于堆积密度，表观孔隙率，表面外观和微观结构。结果表明（1）Mg（OH）₂促进了CaO的晶粒长大，降低了表观孔隙率，并提高了样品的密度。样品的抗水合性增加。（2）提高烧结温度在实验中明显提高了样品的抗水合作用性。（3）随着Mg（OH）₂含量的增加，CaO的晶粒尺寸变得更均匀，并且压坯的密度提高。