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首页> 外文期刊>ISIJ international >Chemical Interactions in Al_2O_3-C/Fe System at 1 823 K:Implications for Refractory Recycling
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Chemical Interactions in Al_2O_3-C/Fe System at 1 823 K:Implications for Refractory Recycling

机译：1 823 K下Al_2O_3-C / Fe系统中的化学相互作用：耐火材料回收的意义

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摘要

An investigation was carried out on recycling spent refractories comprising of Al_2O_3-12.9%C refractory substrate after 30 minutes of interactions with molten iron at 1 823 K. XRF results showed that the spent refractory was contaminated with iron (0.798 wt%). Spent refractories in 10, 20 and 30 wt% proportions were mixed with virgin refractory composition of Al_2O_3-10%C. High temperature interactions of recycled refractory substrates with liquid iron were investigated at 1 823 K to understand chemical reactions occurring in the metal/refractory interface as well as in the bulk of the refractory. The sessile drop technique was used to determine the interfacial wetting behaviour and the phase transformations during interactions with molten iron were determined using SEM and EDS. These investigations determined the role of spent refractory constituents which contains degraded alumina, carbon and iron. The presence of iron and reactive alumina in the refractory substrates was seen to affect both physical and chemical interactions, contact angles and carbon pick-up. The drop in contact angles was in direct correspondence with an increase in carbon pickup. The structural integrity and bonding of the recycled refractory was also compromised, and interfacial cracks were observed along with increases in the interfacial area of contact of metal droplet with refractory. Video images also showed whisker formation on metal droplets during 30 minutes of reaction time. The results from this study have shown that metal contaminated spent refractories tend to enhance refractory degradation during recycling and therefore may be unsuitable for steelmaking applications.
机译：在1823 K下与铁水相互作用30分钟后，对包含Al_2O_3-12.9％C耐火材料的废耐火材料进行了回收利用的研究。XRF结果表明，废耐火材料被铁污染（0.798 wt％）。将废耐火材料按10、20和30 wt％的比例与原始耐火材料Al_2O_3-10％C混合。为了研究在金属/耐火材料界面以及大部分耐火材料中发生的化学反应，在1823 K下对回收的耐火基材与液态铁的高温相互作用进行了研究。使用无滴法确定界面润湿行为，并使用SEM和EDS确定与铁水相互作用期间的相变。这些调查确定了含有降解的氧化铝，碳和铁的废耐火成分的作用。可以看出，耐火基材中铁和活性氧化铝的存在会影响物理和化学相互作用，接触角和碳吸收。接触角的下降与碳吸收的增加直接对应。再生耐火材料的结构完整性和粘结性也受到损害，并且观察到界面裂纹以及金属液滴与耐火材料接触的界面面积的增加。视频图像还显示，在30分钟的反应时间内，金属滴上形成了晶须。这项研究的结果表明，受金属污染的废耐火材料在循环利用过程中往往会加剧耐火材料的降解，因此可能不适用于炼钢应用。

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  • 来源
    《ISIJ international》 |2012年第10期|p.1801-1808|共8页
  • 作者

    Mohammad IKRAM-UL-HAQ; Rita KHANNA; Somyote KONGKARAT; Veena SAHAJWALLA;

  • 作者单位

    Centre for Sustainable Materials Research and Technology, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052 Australia;

    Centre for Sustainable Materials Research and Technology, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052 Australia;

    Centre for Sustainable Materials Research and Technology, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052 Australia;

    Centre for Sustainable Materials Research and Technology, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052 Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alumina; graphite; spent refractory; recycling; refractory degradation; wettability; carbon pickup;

    机译：氧化铝石墨;用过的耐火材料回收;难降解润湿性碳皮卡;

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