膨胀珍珠岩/聚丙烯酸钠复合高吸液材料的研究

选择溶液聚合法,研究了不同用量的引发剂过硫酸钾、交联剂N,N’-亚甲基双丙烯酰胺(MBA)、接枝剂淀粉和不同程度的中和度等对聚丙烯酸钠树脂材料吸水性能的影响,确定了最佳吸水性能下的配方.在最佳配方的基础上,探究了不同掺量膨胀珍珠岩对复合材料吸水和吸0.9%NaCl的影响;采用红外光谱(FT-IR)、扫描电子显微镜(SEM)、X射线衍射分析(XRD)等分析复合材料的组成和结构特征.结果表明,膨胀珍珠岩的质量分数为12%时复合材料的吸液倍率最佳,其吸水和吸0.9%NaCl溶液分别为589 g/g和123 g/g.

利用废镁铝尖晶石砖制备免烧砖的试验研究

以用后耐火材料(废镁铝尖晶石砖)处理得到的剥离钢渣及废镁铝尖晶石为主要原料,辅以水泥制备免烧型路面砖。研究了原料配比、制备工艺对免烧砖微观结构和力学性能的影响规律。得到废镁铝尖晶石砖基免烧砖的优化原料配比和制备工艺为:剥离钢渣和废镁铝尖晶石占总料的90%,水泥10%,成型压力15 MPa。制得的固废基免烧砖常温养护28 d最高抗压、抗折强度分别为9.57、4.86 MPa。

形成性评价在高校化学实验教学中的应用研究

形成性评价是注重学生学习过程的评价,它可以有效弥补片面强调教学效果及总结性评价带来的诸多负面影响。实验教学是化工类专业高校教学中的重要组成部分,在实验教学中有效运用形成性评价,可以提高教学效果,促进学生自主学习能力、动手能力及创新能力的发展,从而使学生全面发展。本文论述了形成性评价的特点及其在实验教学中的应用策略和作用。

Research and development of recycling utilization of used refractories:A review

Due to thermal stability and excellent resistance to slag erosion,the used refractories can be recycled as the main raw material for some refractories.In this article the latest developments about used refractories in metallurgical industry has been reviewed,focusing on the results reported in the past decade.The research and reutilization methods of used refractories were discussed.For the research of used refractories,the results of two aspects,the performance and surface corrosion characteristics,are summarized.Then,the advances in research on recycling technology of several main kinds of used refractories,such as MgO-C,Al2O3-SiC-C,Al2O3-MgO-C,magnesium-chrome,and corundum-spinel refractories were summarized and discussed in detail.Some results of the author’s group were reported等线accompanied by these comments.The microstructure and chemical composition were studied by scanning electron microscopy and energy dispersion spectra,and the properties of the refractories were analyzed.Afterwards,the scope of application of materials was determined according to the classification and analysis of refractories.Finally,the large-scale application of used refractories and an outlook is given to future developments of the entire recycling industry.