莱钢120t精炼炉小炉盖长寿命技术的研制与应用

DEVELOPMENT AND APPLICATION OF LONG-LIFE TECHNOLOGY FOR THE SMALL FURNACE COVER OF 120 t REFINING FURNACE IN LAIGANG

以特级矾土、电熔白刚玉、烧结尖晶石和α-Al2O3微粉为主要原料,采用磷酸盐作结合剂,矾土水泥作促硬剂来制备试样。研究了试样经110、1100、1500℃保温3h处理后的体积密度、强度、线变化率以及抗渣侵蚀性能;并在1100℃下用水冷却试样,多次反复,考察其热震稳定性能;通过快速加热的方法考察分别用氧化铝水泥和磷酸盐作结合剂的材料的抗爆裂性。结果表明,加入某种无机盐能够显著提高试样在各温度下的强度,尖晶石粉的引入可以改善试样的抗渣侵蚀性能,试样的热震稳定性随α-Al2O3微粉加量的增加而提高。另外,不锈钢纤维的引入对热震性能也是有利的。磷酸盐结合试样的抗爆裂性能优于氧化铝水泥结合试样,且能够实现快速烘烤。

The samples were prepared with special-grade bauxite,white fused corundum,sintered spinel andα-Al2O3 micro-powder as the main raw material,phosphate as the binding agent and bauxite cement as the hardening accelerator.The bulk density,strength,linear change rate and the slag corrosion resistance of the samples were investigated after heat preservation 3 h at 110,1 100,1 500℃.Some of the samples heat-treated at 1 100℃were cooled in water,and this cooling process was repeated for several times to study their thermal shock resistance.The explosion resistance of the materials using alumina cement and phosphate as binding agent was studied by rapid heating method.The results showed that adding certain inorganic salt could significantly increase the strength of the sample at various temperatures,the introduction of spinel powder could improve the slag corrosion resistance of the sample,and the thermal shock resistance of the samples increased with the increase ofα-Al2O3 micro-powder.In addition,the introduction of stainless steel fiber was benefit to improve the thermal shock resistance of the samples.Compared with the alumina cement bonded samples,the phosphate-bonded samples had higher explosion resistance and the fast baking could be carried out.