长寿命铝镁碳砖的研究与应用

发布时间：2018-03-19 17:48

本文选题：铝镁碳砖　切入点：应用　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：铝镁碳砖具有高温性、抗渣性和抗剥落性能良好等特点,国内外在钢包中应用较多。随着连铸和炉外精炼等现代炼钢技术的推广应用以及洁净钢产量的增加,钢包耐火材料的使用条件变得更加恶劣,钢水温度的升高、钢水在钢包内停留时间的延长、钢水和熔渣对钢包耐火材料的冲刷以及熔渣对钢包耐火材料的化学侵蚀等都更加严重,制约了钢包寿命的提高,延长钢包使用寿命尤为迫切。为了进一步提高铝镁碳砖钢包的使用寿命和使用效果,本文主要致力于高性能长寿命铝镁碳砖的研制开发与应用,研究内容主要有以下几个方面:1.镁砂加入形式、加入量对铝镁碳砖性能的影响;2.镁砂粒度对材料性能的影响;3.α-Al_2O_3微粉的加入量对抗渣侵蚀性的影响;4.防氧化剂种类和加入量对抗氧化性能的影响。研究结果表明:铝镁碳砖中MgO的加入部分采用预反应尖晶石形式能改善铝镁碳砖性能。采用加入MgO通过烧结反应生成尖晶石时,随着MgO细粉加入量的增加,MgO与Al_2O_3反应逐渐生成尖晶石的数量增多,MgO与Al_2O_3反应生成尖晶石体积膨胀,表现在铝镁碳砖产生的体积膨胀不断地增加,但尖晶石生成产生的体积膨胀可使基质致密化程度提高。以3.5%热塑性酚醛树脂作结合剂,加入5%的α-Al_2O_3微粉,采用特级矾土熟料、镁砂、石墨等作为主要原料,添加剂为金属硅和金属铝复合抗氧化剂,制成高性能铝镁碳砖用于钢包内衬,在马钢三钢70吨钢包现场试用结果表明,使用包龄可以达到100次,远高于原先使用的铝镁浇注料钢包平均65次的使用寿命,减少了浇注料包结构剥落带来的使用安全风险,提高了钢包热周转效率,同时大幅缩短了烘烤时间,实现了节能减排的效果。研制的高性能铝镁碳砖充分发挥了其抗渗透性能、抗渣侵蚀和抗剥落性能等特点,满足生产、施工的要求,取得了较好的环保、经济和社会效益。
[Abstract]:Aluminum-magnesia-carbon brick has the characteristics of high temperature, good slag resistance and peeling resistance, and is widely used in ladle at home and abroad. With the popularization and application of modern steelmaking technology such as continuous casting and off-furnace refining, and the increase of clean steel output, The use conditions of refractory in ladle become worse, the temperature of molten steel rises, and the residence time of molten steel in ladle is prolonged. The erosion of molten steel and slag to refractory material of ladle and chemical erosion of slag to refractory material of ladle are more serious, which restrict the improvement of ladle life. It is particularly urgent to prolong the service life of ladle. In order to further improve the service life and effect of the ladle of aluminum, magnesia and carbon brick, this paper mainly devotes to the research and development and application of high performance and long life aluminum magnesia carbon brick. The main contents of the study are as follows: 1.The form of magnesia addition, Effect of addition amount on properties of aluminum-magnesia carbon brick. Effect of granularity of magnesia sand on material properties. Effect of addition of 伪 -Al _ 2O _ 3 micro-powder on slag corrosion resistance. Effect of type and amount of anti-oxidant on oxidation resistance. The results show that:. The properties of Al-MgO-C brick can be improved by the addition of MgO in the form of pre-reactive spinel. When the addition of MgO is used to produce spinel by sintering reaction, With the increase of the content of MgO fine powder, the amount of spinel formed by the reaction of MgO with Al_2O_3 gradually increased. The volume expansion of spinel formed by the reaction of MgO with Al_2O_3 was manifested in the increasing volume expansion of Al-MgO / Mg-C brick. However, the volume expansion produced by spinel formation can increase the densification degree of matrix. With 3.5% thermoplastic phenolic resin as binder, 5% 伪 -Al _ 2O _ 3 micropowder was added, and special grade bauxite clinker, magnesite, graphite and so on were used as main raw materials. Aluminum-magnesia-carbon brick with high performance is made from metal silicon and metal aluminum composite antioxidants to be used in ladle lining. The field trial results of 70 tons ladle at Masteel show that the ladle life can be up to 100 times. The service life of the ladle is much higher than that of the aluminum-magnesium castable ladle, which reduces the safety risk caused by the spalling of the castable ladle structure, improves the hot turnover efficiency of the ladle, and greatly shortens the baking time. The high performance aluminum-magnesia-carbon brick has fully developed its characteristics of impermeability, slag erosion resistance and peeling resistance, and has met the requirements of production and construction, and has achieved better environmental protection, economic and social benefits.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ175.7;TF341

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