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本文介绍了两座高炉破损调查,分析了引起炉壳开裂的可能原因.对残砖进行了x-射线衍射、岩相、扫描电镜、热膨胀和化学分析,必要的模拟试验及理论计算.得出,液态K_2CO_3侵蚀粘土砖生成钾霞石,引起49%的体积膨胀是造成炉底上涨及炉缸钢壳开裂的主要原因.分析了炉底碱的来源,探讨了碱侵蚀粘土砖引起炉壳开裂的机理.结果表明,除原料中含碱高外(入炉K_2O>14kg/t铁),操作不稳定,休风闷炉等导致炉温波动是加剧碱侵蚀粘土砖的重要因素.
This paper introduces the investigation of the damage of two blast furnaces, and analyzes the possible causes of cracking of furnace shell.The x-ray diffraction, lithofacies, scanning electron microscope, thermal expansion and chemical analysis, necessary simulation and theoretical calculation are carried out on the residual bricks. , The K 2 CO 3 inhomogeneous clay bricks produced kaibeishan, resulting in 49% volume expansion is the main reason causing the furnace bottom rising and cracking of the steel shell of the hearth.Analysis of the source of furnace bottom alkali, The results show that, except for the high content of alkali in raw materials (K2O> 14kg / t iron), the operation is not stable and the fluctuation of furnace temperature caused by wind and stuffy furnace is the important factor that aggravates alkali-attacked clay brick.