Corrosion mechanism of spray refractory in COREX slag with varying basicity
Corrosion mechanism of spray refractory in COREX slag with varying basicity
复制标题
不同碱度COREX渣中喷射耐火材料的腐蚀机理
DOI：
10.1016/j.ceramint.2019.08.161
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发表时间：
2019-08
影响因子：
5.2
通讯作者：
Zou Qingfeng
中科院分区：
文献类型：
--
作者：
Pan Dunxiang;Zhao Huizhong;Zhang Han;Zhao Pengda;Li Yichong;Zou Qingfeng
铝土基喷雾耐火材料具有优良的机械强度和耐磨性，多年来被广泛用作各种工业窑炉的炉衬材料。然而，COREX生产的炉渣在高速气流下进行熔融还原炼铁，会造成高温下耐火材料的侵蚀。本文制备了Al_2O_3-SiO_2-CaO系喷雾耐火材料，并用配制的Corex渣在空气中进行了碱度从0.5到1.0的侵蚀试验。通过X射线衍射、扫描电子显微镜(背散射电子图像和能量色散X-射线能谱)和热力学模拟研究了喷雾耐火材料与COREX渣之间的侵蚀机理，建立了新的侵蚀模型。结果表明，经1300 °C烧结后，样品的主晶相为刚玉、莫来石和钙长石。腐蚀后，从表面到内部观察到反应层和渗透层。在渣-耐火材料界面处生成了高熔点的镁铝尖晶石层，有效地防止了试件与熔渣的进一步相互作用，具有较好的抗腐蚀性。反应层腐蚀是由于相转变为基质中的Ca2Al2SiO7。炉渣与耐火材料相互作用的热力学模拟结果与侵蚀试验结果一致。当炉渣碱度为0.9时，试件的总侵蚀深度最大。本研究探讨了Corex内喷涂耐火材料的最佳性能环境，为相关耐火材料的相组成设计提供了有效的指导。
Bauxite-based spray refractories typically exhibit excellent mechanical strength and wear resistance, and have been widely used as lining materials in various industrial furnaces for many years. However, smelting reduction ironmaking in the COREX-produced slag carried out under a gas flowing at a high speed causes refractory corrosion at high temperature. Herein, Al2O3–SiO2–CaO spray refractories were fabricated, and corrosion tests were conducted in an air atmosphere using the formulated COREX slag by varying the slag basicity from 0.5 to 1.0. The mechanism underlying the corrosion between the fabricated spray refractories and formulated COREX slag was investigated via X-ray diffraction, scanning electron microscopy (backscattered electron image and energy-dispersive X-ray spectroscopy), and thermodynamic simulations to establish a new corrosion model. The results showed that after sintering at 1300 °C, the prepared specimens contained corundum, mullite, and anorthite as the major crystalline phases. The reaction and penetration layers were observed from the surface to the interior of the specimens after corrosion. A high-melting-point phase, Mg(Al,Fe)2O4spinel layer, was generated at the slag–refractory interface, which effectively protected the specimens from further interaction with the molten slag, and afforded better corrosion resistance. The reaction layer corroded due to the phase conversion into the Ca2Al2SiO7in the matrix. The thermodynamic simulation results of the interaction between the slag and refractory were consistent with those of the corrosion test. The total corrosion depth of the specimen was optimum when the slag basicity was 0.9. This study investigates the optimal performance environment of the spray refractory inside the COREX and provides an effective guide for designing the phase composition of related refractories.
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影响因子：
1.8
作者：
T. Usui;M. Ohmi;E. Yamamura
通讯作者：
T. Usui;M. Ohmi;E. Yamamura
影响因子：
1.8
作者：
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通讯作者：
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作者：
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P. P. Kumar-P.;A. Dasu;M. Ranjan;T. Naha
DOI：
--
发表时间：
2008-09
期刊：
Taikabutsu overseas
影响因子：
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作者：
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通讯作者：
Y. Furuta;Mitsuo Sugawara;K. Asano;K. Gotoh;H. Imagawa;Kohji Kohno
影响因子：
1.6
作者：
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