The difference betWeen the systems of CaO-SiO2-H2O and CaO-SiO2-Al(OH)3-H2O, was studied,especially the effect of Al3+ on the crystallinity of tobermorite was focussed. As a result, in the system of CaO-SiO2-H2O, tobermorite formed early, howevey, with reaction time forward, tobermorite was replaced by xonotlite. So far as CaO-SiO2-Al(OH)3-H2O was concemed, hydrothermal reaction was carried out under the same condition as CaO-SiO2-H2O to study the morphological changes of tobermorite crystals. It was found that Al3+ accelerated the crystal growth of tobermorite to some extent and was in favor of platy crystals. Moreover, with the Al3+ content increasing in the starting material, the morphology of tobermorite did not change magnificently, but platy crystals became more and more eminent. As soon as the Al2O3
文档格式：PDF 文档大小：475.72KB 文档页数：5
以大同烟煤为原料、Fe3O4作为添加剂,催化制备了煤基磁性活性炭(MCAC).利用氮气吸附等温线表征了MCAC的孔隙结构,并考察了其吸附性能(碘值、亚甲兰值)和磁学性能.结果表明,Fe3O4对MCAC孔隙的产生具有催化作用,有利于活性炭中孔的形成和发育.其中添加10% Fe3O4的MCAC中孔率高达76.0%.MCAC与普通活性炭(AC-0)相比,碘吸附值明显降低,而亚甲兰吸附值显著提高.添加7% Fe3O4的MCAC,其碘值降低了25.5%,亚甲兰值提高了79.9%.添加适量的Fe3O4制备的MCAC具有较高的比饱和磁化强度和磁导率.Fe3O4质量分数为4%和10%时,所得MCAC的比饱和磁化强度分别是AC-0的24.4倍和44.5倍
文档格式：PDF 文档大小：808.05KB 文档页数：6
在西沙群岛高温、高湿的海洋大气环境下对Q235碳钢进行了3个月的暴晒实验,利用电子探针、激光拉曼等观察分析了暴晒后样品的锈层特征.结果表明:Q235碳钢暴晒1个月后迅速形成较厚的锈层,锈层疏松多孔,多裂纹;当暴晒3个月时,锈层却明显减薄.Q235碳钢在西沙暴晒1个月后形成的外层腐蚀产物主要是γ-FeOOH、β-FeOOH、α-FeOOH及少量Fe3O4等,而锈层内部主要为Fe3O4、γ-Fe2O3等铁的氧化物.暴晒3个月后,疏松锈层的内部电解液蒸发加剧,内层还原后的锈层重新被氧化,生成较多的FeOOH,同时部分γ-FeOOH转化成为α-FeOOH.Q235碳钢在西沙大气环境下的暴晒过程(也就是锈层的氧化还原反应的交替过程)中,钢基体不断地被腐蚀
文档格式：PDF 文档大小：407.54KB 文档页数：6
基于炉渣离子-分子共存理论(IMCT)建立了CaO-SiO2-MgO-Al2O3炼铁渣系的硫化物容量预报模型,即IMCT-CS2-模型,比较了该渣系1773 K时实测的硫化物容量、IMCT-CS2-模型预报的硫化物容量及其他五种硫化物容量模型的计算结果.结果表明,由IMCT-CS2-模型预报的1773K时CaO-SiO2-MgO-Al2O3炼铁渣系的硫化物容量更精确.本文建立的IMCT-CS2-模型不仅可计算该渣系的总硫化物容量,而且可计算该渣系中自由CaO和MgO各自的硫化物容量.1 773 K时CaO-SiO2-MgO-Al2O3炼铁渣系中Al2O3质量分数由10%增加到17%,CaO质量分数由38%增加到44%,MgO质量分数由12%降低到4%可使自由CaO对该渣系的总硫化物容量贡献率由97%提高到99%,同时使自由MgO的贡献率由3%降低到1%
