共查询到20条相似文献,搜索用时 406 毫秒
1.
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
2.
研究了Al、Si和B4C几种抗氧化添加剂对低碳镁碳砖抗氧化性能的影响.利用热重法分析了加热过程中耐火材料试样的失重率;测定耐火材料的脱碳层厚度;探讨了抗氧化添加剂的作用机理;并明确了适合于低碳镁碳砖用抗氧化添加剂的种类.研究结果表明,与添加Al和Si相比,添加B4C能更好地提高低碳镁碳砖的抗氧化性能.通过在低碳镁碳砖中... 相似文献
3.
摘要:MgO-C耐火材料的低碳化有利于减少耐火材料对钢水的增碳作用,降低不可再生资源的使用量,符合绿色冶金宗旨。围绕低碳MgO-C耐火材料的抗热震性、抗氧化性、抗渣侵蚀性3个关键性能,综述了国内外学者在低碳MgO-C材料性能优化取得的研究进展。最后,对低碳MgO-C耐火材料的发展方向进行了展望。 相似文献
4.
The low-carbon magnesia-carbon(MgO-C)composites containing 3%(mass fraction,the same below)carbon were prepared by adding various types of carbon black(CB).The mechanical properties,oxidation resistance at 1100 ℃ in oxidizing atmosphere,and thermal shock resistance after 5 times dipping in 1600 ℃ molten steel of the low-carbon composite samples were investigated,compared with a commercial high-carbon MgO-C composite containing carbon of 16%.The results show that the mechanical properties,oxidation resistance and thermal shock resistance of the low-carbon samples are improved with the decrease of CB particle size.Thermal shock resistance of the low-carbon sample containing nanometer CB N220 is obviously better than that of other low-carbon samples,and reaches the level of the high-carbon samples. 相似文献
5.
采用座滴法测定固液间接触角,分别对镁碳质基片及基片中的两种主要组元与LF精炼渣之间的润湿性进行了研究,并从润湿性角度研究了镁碳砖损毁机理。研究表明,在精炼温度下,熔渣对石墨均呈不润湿状态,温度越低越不容易润湿。而熔渣对MgO组元呈完全润湿状态。熔渣与镁碳质基片间的接触角在温度为1 460~1 480 ℃时存在明显转折,在转折点温度以下,MgO和碳的反应受到抑制,熔渣对基片保持不润湿状态。在转折点温度以上,镁碳质基片中的MgO和碳发生反应生成镁蒸汽和CO气体。该反应导致基片内碳质量分数减少,熔渣对基片的接触角迅速下降,最终呈完全润湿。当熔渣与基片间的接触角小于90°时,熔渣将对基片产生明显渗透作用。MgO与碳反应形成的孔隙成为熔渣渗透的主要通道。熔渣渗透到镁碳质基片内部的未反应层时,由于两者之间的不润湿性及较少的孔隙阻碍了熔渣的进一步渗透。 相似文献
6.
7.
The influence of V2O3, FeO, TiO2, MnO and MgO in vanadium slag on the corrosion mechanism of MgO-C bricks was studied by stationary immersion tests at vanadium-extracting temperature. Experimental results show that FeO, TiO2, and MnO could enhance the corrosion rate and V2O3 and MgO could decrease it. Microstructure and phase composition of worn samples were investigated by SEM-EDS, revealing the presence of Fe particles, produced by graphite reduction, and (Mg,Fe,Mn)O solid solution at the interface. The formation process of (Mg,Fe,Mn)O solid solution was discussed and the corrosion mechnism of MgO-C bricks was thus proposed. 相似文献
8.
采用静滴法研究了2种情况下转炉渣与炉衬耐火材料的润湿性。当转炉渣与耐火材料直接接触时,转炉渣不熔化,当用刚玉坩埚将两者隔开时,界面处发生反应性润湿,动态接触角随温度升高而单调减小,铺展面积随时间成线性增加。渣中FeO含量由于镁碳砖基板表面的碳及中间产物CO的还原而降低,导致炉渣熔化性温度升高而未熔化。液态熔渣沿镁碳砖表面的气孔和裂纹向基体内扩散、渗透,渣中铁氧化物与镁碳砖机体内的MgO反应生成含高熔点相的黄色渗透层,起到保护炉衬的作用,从而解释了炉渣与耐火材料的粘附机制,为优化溅渣护炉工艺,合理调整炉渣成分和选择耐火材料等工艺操作提供理论依据。 相似文献
9.
宝钢用后废弃MgO-C砖的再生利用 总被引:2,自引:0,他引:2
随着世界环保、循环经济的发展,我国加大对用后废弃耐火材料开发利用的力度.文章概述了国内外用后耐材的基本状况,详细介绍了宝钢废耐材资源的情况,并对用后废弃转炉钢包镁碳砖进行了深入的研究开发,同时还探讨了其它几类废耐材的利用方法.开发成功的优质再生镁碳砖,试验研究发现无论在使用中的表现和使用寿命还是用后残厚均与目前使用的镁碳砖无差别,其使用性能已达到目前宝钢炼钢厂正常使用镁碳砖的水平,能满足多种精炼工况条件下大型钢包的要求.在宝钢300 t钢包渣线上的使用取得了良好效果. 相似文献
10.
11.
12.
13.
镁——尖晶石——碳砖在包钢90t钢包上的应用 总被引:1,自引:0,他引:1
依据镁铝尖晶石比方镁石的热震稳定性好,具有良好的抗渣、抗金属熔融物的侵蚀及良好抗浸润性的特点,将不同配方的镁-尖晶石-碳砖在包钢90t钢包上进行对比试验,经观察,镁-尖晶石-碳砖效果明显好于原镁碳砖,可进一步提高90t钢包的使用寿命。 相似文献
14.
15.
16.
17.
A slag layer is formed when slag is splashed onto refractory lining in BOF slag splashing process. The melting temperature of the slag layer and the adhesion of the slag layer to the lining refractory have an important effect on slag splashing and BOF lining life. This study investigates the adhesive behaviour of slag with different composition to lining refractories. It is shown that the slag can adhere to MgO particles in MgO‐C bricks well and no reaction is found between the MgO particles and the slag layer, but a gas gap exists at the interface between the slag layer and the MgO‐C matrix and there are iron granules within the slag layer, when the FeO content in the slag is high. The adhesion of the slag layer to the lining refractory can be improved with decreasing FeO content in the slag and lower carbon content in the MgO‐C bricks. BOF refractory lining life can be greatly increased due to better adhesion, high melting temperature, and stronger wear‐resistance of the slag layer. 相似文献
18.
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
19.