含钛渣对高炉炉缸耐火材料侵蚀的影响

Influence of Slag Containing Titanium on the Corrosion of Refractories Used in Blast Furnace Hearth

为明确含钛高炉渣对炉缸用耐火材料侵蚀的影响,通过动态侵蚀试验研究了高炉炉缸用碳复合砖和刚玉砖在CaO-SiO_2-MgO-Al_2O_3-Cr_2O_3-TiO_2渣中的侵蚀行为。结果表明:炉渣向碳复合砖基体的渗透、碳复合砖中的组元在渣中的溶解以及碳复合砖与炉渣的反应等综合作用最终导致了碳复合砖的破损。刚玉砖在含TiO_2炉渣中的侵蚀主要由炉渣的渗透以及刚玉砖的溶解造成。XRD结果表明:碳复合砖侵蚀面的物质主要由C、Al_2O_3、黄长石、镁铝尖晶石、铝酸钙、Cr_7C_3和TiC组成,刚玉砖侵蚀面物相主要由Al_2O_3、SiC、镁铝尖晶石、黄长石和TiC组成。通过对比碳复合砖和刚玉砖在含TiO_2炉渣中的侵蚀行为,可以发现由于碳复合砖中存在较多的碳和碳化硅等物质,使得碳复合砖具有较好的抗渣侵蚀能力。

In order to clarify the influence of TiO2-containing slag on the corrosion of refractories used in blast furnace hearth, the corrosion behavior of blast furnace hearth refractories such as carbon composite brick and corundum brick in CaO-SiO2-MgO-Al2O3-Cr2O3-TiO2 slag was investigated by using finger rotation method. The experimental result indicated that the comprehensive effects of slag penetration, the components of the carbon composite brick dissolution and slag-brick interaction eventually resulted in the corrosion of carbon composite brick. The corrosion of corundum brick was mainly due to the infiltration of slag and the dissolution of brick. According to the XRD results, the surface products of the carbon composite brick after corrosion were C, Al2O3, melilite, spinel, calcium-aluminate, Cr7C3 and TiC. The surface compositions of the corroded corundum brick were Al2O3, SiC, spinel, melilite and TiC. Compared with the corrosion behavior of carbon composite brick and corundum brick in slag containing TiO2, due to the existence of C and SiC in carbon composite brick, the slag corrosion resistance of the carbon composite brick was better than that of corundum brick.