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电熔镁砂加入量对铝镁尖晶石质钢包浇注料性能的影响 总被引:1,自引:0,他引:1
以特级阳泉矾土、棕刚玉、电熔镁砂等为主要原料,通过调整浇注料中镁砂的粒度和加入量,优化浇注料的基质组成,使铝镁尖晶石浇注料具有优良的抗渣性和抗剥落性能。 相似文献
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摘要:钢中添加适量铝元素可以提高其韧性与耐腐蚀性,但在冶炼过程中会影响炉渣中Al2O3含量而改变其与现行铝镁质浇注料的界面反应,制约钢种冶炼及品质提升。因此,采用静态坩埚法开展铝镁质浇注料的抗CaO-Al2O3-SiO2渣蚀实验,并结合热力学模拟计算探究Al2O3含量(w(CaO)∶w(Al2O3),C/A)变化对耐火材料渣蚀的影响规律,得到以下结论:随着熔渣中Al2O3含量的增加,铝镁质浇注料与熔渣反应界面越易形成更厚的高熔点隔离层,将耐火材料组分向熔渣中的直接溶解转变为间接溶解,有利于提升铝镁质浇注料的抗侵蚀性;当渣中的Al2O3质量分数在32%左右时,熔渣的侵蚀性总体较弱,但当渣中的Al2O3质量分数不小于36%时,熔渣对铝镁质浇注料产生了严重的渗透性,也易造成材料变质剥落。这为面向含铝钢冶炼用耐火材料的优化设计提供参考。 相似文献
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介绍了结合剂ρ—A12O3微粉的特性,对其结合高纯铝镁浇注料的流动性、强度和抗渣性进行了研究。 相似文献
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《工业炉》2020,(2)
为了研究钛铝酸钙替代或部分替代高铝骨料对铝镁浇注料性能的影响,用粒径为5~3 mm、3~1 mm的钛铝酸钙分别替代铝镁浇注料中相同粒级的A85高铝矾土(浇注料中钛铝酸钙质量分数分别为0%、4%、8%、12%、16%、20%,换算成钛铝酸钙对高铝矾土的替代率则分别为20%、40%、60%、80%和100%)。经过配料、混炼、震动成型、养护、干燥后,再分别经110℃×24 h、1 200℃×3 h、1 550℃×3 h处理,检测试样的常温抗折强度、常温耐压强度、气孔率、体积密度和抗渣性等性能。结果表明:钛铝酸钙对高铝矾土替代率为60%时,浇注料的综合性能指标最优。 相似文献
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以电熔白刚玉、板状刚玉、电熔镁砂、氧化铝微粉、富铝尖晶石微粉等为主原料,研制开发了自结合铝镁(铬)浇注料预制块砖。该预制块砖比传统的钢包浇注料具有更好的抗渣侵蚀和抗剥落性能。在RH精炼钢包上使用渣线平均蚀损0.4毫米/炉、包衬平均蚀损0.31毫米/炉、包底平均蚀损1.68毫米/炉;在LF精炼钢包上使用包壁平均蚀损0.6毫米/炉。 相似文献
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通过对钢包底部浇注料的损毁机理分析,结合攀钢160T钢包实际使用情况,合理选材。优化配方设计,探讨了微粉加入量、MgO加入形式等对浇注料抗渣蚀性、热震稳定性的影响,并在攀钢160T钢包底进行实际应用,成功开发出钢包底用铝镁浇注料。 相似文献
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The toughness and erosion resistance of steel can be improved by adding an appropriate amount of aluminum. However it will increase the content of Al2O3 in slag and react with the existing alumina magnesia castable, and affect smelting and quality of steel. Therefore, static crucible method was applied, corrosion experiments of the CaO-Al2O3-SiO2 slags on the alumina magnesia castable were carried out, and the influence of Al2O3 content (w(CaO)∶w(Al2O3), C/A ratio) on slag corrosion resistance was investigated by combining thermodynamic simulation. The following conclusions were obtained: with the increase of Al2O3 content in the slags, the thicker isolation layer with high melting point is easier to form at the reaction interface between alumina magnesia castable and the slags. The direct dissolution of the refractory components into the slags can be changed to indirect dissolution, which is conducive to improving the corrosion resistance of alumina magnesia castable. Nevertheless, when the content of Al2O3 in the slag is about 32 wt.%, the slag corrosion is generally weak, when the content of Al2O3 in the slag is more than 36 wt.%, the slag has serious permeability to the alumina magnesia castable, which is easy to cause the deterioration and spalling of the material. It provides guidance on the optimization and design of the refractories for Al containing steel smelting. 相似文献
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Due to the corrosion of CaO-Al2O3 based slags on refractory materials is related to the safe smelting of low-density and high-strength steel with high aluminum, the reaction experiment of calcium hexaaluminate castables with high-alumina and low-silicon CaO-Al2O3 based slag was carried out by introducing calcium hexaaluminate into corundum castables, and it was compared with that of alumina magnesia castable. The experimental results agreed with that of thermodynamic simulation and show that corundum calcium hexaaluminate castable has excellent slag resistance. Because the corundum calcium hexaaluminate castable reacted with the CaO Al2O3 based slag and produced high melting point phase CA2, which consumed a large amount of CaO in the slag and increased the viscosity of the slag, and CA2 filled the pores and blocked the penetration of slag. The wear mechanism of the calcium hexaaluminate castable is slag infiltration due to the higher porosity. Therefore, the combination of corundum aggregates and calcium hexaaluminate matrix is expected to be a candidate refractory material for ladle lining of low density and high strength steel smelting. 相似文献
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摘要:由于高铝低硅CaO-Al2O3系熔渣对耐火材料的侵蚀损毁影响高铝含量低密度高强钢的安全冶炼生产,为此通过在刚玉质浇注料中引入六铝酸钙,开展六铝酸钙质浇注料与高铝低硅CaO-Al2O3系熔渣反应实验,并与铝镁浇注料进行对比研究了其作用行为。实验结果表明:刚玉 六铝酸钙浇注料具有优异抗渣性能。这主要是由于熔渣中大量的CaO被消耗,间接提高了熔渣黏度,并与刚玉 六铝酸钙浇注料反应生成的高熔点相CA2填充了气孔,阻挡了熔渣的渗透,实验结果与热力学模拟计算结果相吻合。六铝酸钙浇注料自身气孔率高,熔渣主要以渗透形式对六铝酸钙耐火材料造成破坏。因此,将刚玉骨料与六铝酸钙基质组合是有望成为低密度高强钢冶炼用钢包内衬候选耐火材料。 相似文献
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以电熔白刚玉为主要原料,同时加入电熔镁砂细粉、铝酸钙水泥、α-Al2O3微粉、Si O2微粉等,保持镁砂细粉与白刚玉粉总加入量一定,通过改变镁砂细粉的加入量,研究了镁砂细粉加入量对Al2O3-MgO浇注料抗渣性的影响。研究结果表明:在Al2O3-MgO浇注料中加入一定量的镁砂细粉,高温下可以形成镁铝尖晶石,从而提高浇注料的抗渣侵蚀性。当镁砂细粉加入量在2%~6%时,浇注料的抗渣侵蚀性能最好。 相似文献
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