共查询到20条相似文献,搜索用时 112 毫秒
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对比阐述了镁钙碳砖与镁碳砖在酒钢120吨精炼钢包上使用可行性,并就镁钙碳砖的生产工艺及结构组成进行了详细的讨论,提出了用镁钙碳砖代替镁碳砖作为酒钢120吨精炼钢包内衬。 相似文献
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为了研究钢包废镁碳砖1~0 mm颗粒等量代替镁砂1~0 mm颗粒对镁质浇注料性能的影响,以96%高纯镁砂和艾肯951u硅灰为主要原料制备了镁质浇注料。研究了废镁碳砖1~0 mm颗粒代替量为0%、2%、4%、6%、8%、10%、12%、14%对镁质浇注料性能的影响。结果表明:随着废镁碳砖1~0 mm颗粒加入量的增加,试样经低、中、高温度处理后,体密、抗折强度、耐压强度、1 450℃×1 h高温抗折强度逐渐减小,气孔率和线变化率逐渐变大,抗渣渗透性能先增强后减弱。当废镁碳砖1~0 mm颗粒代替量为8%时能够满足使用,且可以降低制品成本。 相似文献
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用后耐火材料再生与利用技术现状与发展 总被引:1,自引:0,他引:1
分析用后耐火材料废弃的危害和潜在的资源价值,综述国内外钢铁企业对用后耐火材料的再利用的技术现状及其发展趋势,介绍国内钢厂对用后镁碳砖、铝镁碳砖、铁沟料、镁铬砖、钢包浇注料等的再利用研究成果与再生耐火材料的性能,试验与应用结果表明,再生耐火材料性能接近或达到新产品水平,甚至达到优质耐火材料水平. 相似文献
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介绍了铝镁碳砖在宝钢连铸钢包中的应用情况,并对铝镁碳砖的蚀损特征作了分析研究。结果表明:(1)在出钢温度提高、钢液滞留时间长的条件下,300t钢包铝镁碳质包衬使用寿命提高到50次以上,最高达102次。(2)铝镁碳砖的蚀损主要是由于氧化脱碳所致。蚀变层中镁铝尖晶石的形成,提高了砖的抗侵蚀性能。(3)铝镁碳砖永久微残余膨胀特性使包壁整体性良好,这给包衬解体带来很大方便。 相似文献
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目前莱钢炼钢厂非精炼钢使用全浇注料钢包,精炼钢使用全镁碳砖砌筑钢包,两种钢包在使用寿命、温降、成本等方面有明显差异,给转炉操作及生产节奏和成本控制带来很大困难。通过研究,研制开发了适合炼钢厂生产条件的综合砌筑钢包,达到了稳定生产、降低成本的目的。 相似文献
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为延长MgO-C砖在提钒转炉上的使用寿命,本研究开发了一种新型MgO-Fe-C砖,通过与传统的MgO-C砖进行对比研究,考察这种新型耐火材料的使用性能.研究结果表明:在1400℃的使用温度下,导致提钒转炉用MgO-C砖使用寿命短的原因是脱碳层的烧结性差,抗冲刷性不理想;而对于本研究所开发的MgO-Fe-C砖,铁粉在氧化层氧化及使用条件下原位形成MgO-FeOss,有效地改善脱碳层的烧结性能,并形成致密且高结合强度的脱碳层,显著地提高了耐火材料的抗熔渣侵蚀性和抗氧化性,有利于耐火材料寿命的提高,因此MgO-Fe-C砖是具有良好应用前景的提钒转炉用MgO-C砖的替代品. 相似文献
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介绍了宝钢不锈钢分公司不锈钢生产线自2004年4月18日投产以来,95 t脱磷铁水包、100 t超高功率交流电弧炉、100 t电炉母液包、120 tAOD氩氧脱碳转炉、120 tVOD真空精炼装置、不锈钢连铸中间包系统及连铸用功能性耐火材料的选择和使用情况.投产近3年来,不锈钢分公司不锈铜生产线各热工设备的包龄、炉龄、功能性耐火材料的使用寿命都有了较大幅度的提高,特别是AOD转炉和VOD钢包的耐火材料迅速国产化,以国产耐材代替进口耐材,使不锈钢冶炼用耐火材料成本大幅降低,使宝钢不锈钢在市场更具竞争力. 相似文献
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随着钢铁工业的一不断发展,对于耐火材料的要求也越来越苛刻,对于包钢炼钢厂来说,由于炉表炼的投入使用,对于钢包渣线用镁碳砖的要求也越来越苛刻,本文重点论述了渣线镁碳砖所用的各种原料对于镁碳砖性能的影响。 相似文献
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Voicu Brabie 《国际钢铁研究》1997,68(2):54-60
The conditions of formation of inclusions in steel during ladle refining in MgO-C lined ladles have been investigated in laboratory experiments at 1873 K in MgO-C crucibles with 50 g iron. From both the experimental results as well those of a thermodynamic study conducted in parallel, the following conclusions can be made about the reaction mechanism between the MgO-C refractory and aluminium deoxidised molten steel: At steelmaking temperature an internal oxidation-reduction occurs in the MgO-C refractory. The formation of a thin oxide layer at the interface is due to the reaction between magnesium vapour and aluminium dissolved into the molten steel and the CO(g) generated by the reaction between MgO and C in the crucible walls. The oxide inclusions formed in the steel have been shown mainly to consist of MgO, Al2O3 or mixture of them. Some of the finest inclusions are considered to be formed as secondary inclusions during cooling and solidification of the steel and they are connected only with the diffusion of magnesium from the crucible to the molten steel. The thermodynamic calculations indicate that during vacuum refining, as the pressure decreases, the chemical compatibility of carbon-bonded magnesia for ladle lining decreases. 相似文献
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Olena Volkova Piotr R. Scheller Bernd Lychatz 《Metallurgical and Materials Transactions B》2014,45(5):1782-1792
Today, MgO-C bricks are widely used in steel industry due to their excellent resistance to slag corrosion and thermal shock increased particularly by the carbon content. The presence of carbon makes these bricks very susceptible to oxidation, leading to a reduction of the strength and to the penetration of metal and/or slag. The aim of this paper is to investigate the processes of carbon oxidation of MgO-C commercial bricks containing 7 and 14 pct C by both isothermal and non-isothermal methods. The results show that carbon oxidation of the samples is limited by diffusion through the pores only. If the carbon content does not have a greater influence on the oxidation process at lower temperatures, then at higher temperatures the weight loss increases with increasing carbon content. Both types of commercial bricks oxidize directly in a lower temperature range and indirectly at higher temperatures. That means that the indirect oxidation does not exist alone, but is initiated by direct oxidation of carbon. Activation energy and diffusion coefficient for different bricks have been determined and compared with literature data. The results of the investigation of the non-isothermal carbon oxidation show that for one and the same final thermal state of the refractory the carbon oxidation can be essentially minimised by choosing specific heating-up rates. 相似文献
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This investigation is a continuation of the studies of the use of boron carbide as an antioxidant in refractory carbon-containing materials. The previous studies were concerned with the stability of boron carbide at high temperatures. The present work gives an account of the wetting conditions and microstructural characteristics of a fired MgO-C brick containing boron carbide additive. The results obtained show that a contribution may be made to the oxidation-inhibiting protective action of the carbide by the formation of a continuous network of dense bridges of borate melts between periclase grains. A white layer with a high percentage of magnesium borate is produced between the decarbonized and non-decarbonized material. The nature of this layer is similar to that from secondary MgO in MgO-C bricks with no additive. The occurrence of this layer is the subject of further research. 相似文献
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