【作者】 何勇；

【导师】 黄佳木； 李代荣；

【作者基本信息】 重庆大学 ， 材料工程， 2007， 硕士

【摘要】 铁沟料是使用于高炉出铁沟的一种不定形耐火材料,占高炉炉前用耐火材料70%以上。铁沟料的性能是影响高炉出铁沟使用寿命和通铁量大小的主要因素,并对高炉吨铁耐火材料成本、劳动强度、工作环境等有直接影响。本文针对重钢高炉出铁沟现用Al2O3-SiC-C质低水泥浇注料,存在使用寿命较短,一次性通铁量小的生产实际问题,对高炉出铁沟材料的使用条件和需具备的物理化学性能以及材料的损毁机理进行了分析研究。通过分析认为铁沟料在使用中寿命低、通铁量小主要是渣铁侵蚀、铁水冲刷、热冲击和高温氧化几方面共同作用的结果。本文对铁沟料用刚玉、碳化硅、碳素材料以及各种添加剂在铁沟料中的作用及其综合性能的影响进行了研究,就提高和改善铁沟料的抗渣性、抗冲刷性、抗热冲击能力和抗氧化性设计配制了新的溶胶结合Al2O3-SiC-C系高炉出铁沟材料。经过反复试验确定了材料的最佳配比,通过x射线荧光分析、偏光显微分析、扫描电镜(SEM)等测试手段,对新高炉出铁沟材料的物相、成分以及微观结构进行了分析。试验结果表明,通过添加烧结剂促进铝微粉和硅微粉在适当温度下反应生成莫来石相可以提高材料的抗热震稳定性,通过优化抗氧化剂可以提高材料的抗氧化性,通过优化碳化硅的级配、加入量等手段可以提高材料的抗渣蚀能力和抗冲刷能力。此外,论文还对硅溶胶取代水泥作为结合剂改善铁沟料的中高温性能进行了试验研究,并通过改善铁沟料的施工性能从而改善铁沟料的组织结构,进而提高了材料的高温性能。论文最后对新配置的高通铁量铁沟材料进行了生产性试验,结果表明:新的溶胶结合Al2O3-SiC-C系铁沟材料的抗渣性、抗热冲击性、抗氧化性、中高温性能等较改造前均有较大提高,一次性通铁量达到16.3万吨,较改造前提高60%以上。更多还原

【Abstract】 Iron trough, as a kind of amorphous refractories, is the main blast furnace refractories with dosage of refractories more than 70 percent. The performance, life of iron trough and flux of iron directly affect the cost of refractories, labor intensity and working conditions. In fact, in Chongqing Steel Company, there were some problems such as low life, small flux of iron and so on. In this paper, in order to solve these problems there were some research on iron trough. The cooperation of iron erosion, molten iron eroding, thermal shock and high-temperature will reduce the life of iron trough and the flux of iron. In this paper, the effects of alumina, silicon carbide, carbon materials and various additives and the impact of comprehensive performance were studied. In order to improve the slag resistance, anti-erosion, thermal shock resistance and oxidation resistance of iron trough, a new sol-binded Al2O3-SiC-C material was used in this paper. By repeated tests the best ratio of the material was determined. The crystalline structure, composition and morphology of the materials were tested and analyzed by X-ray fluorescence analysis, analysis of polarizing microscopy, scanning electron microscopy. The test results show that mullite composed by aluminum micronization and silicon micronization can improve the thermal shock resistance, at the same time, better antioxidant and grade of silicon nitrification can increase the oxidation resistance and the slag resistance of the materials separately. Otherwise the improving structure of iron trough by using silicon gel as the substitution of cement can enhance the performance at high temperature. At last, flux of iron was improved by using the new iron trough. The results show that the slag resistance, anti-erosion, thermal shock resistance and oxidation resistance of Al2O3-SiC-C iron trough with sol were improved obviously. For example, the flux of iron was 163000 tons, which was enhanced 60 percent than the former.更多还原