点火炉用硅溶胶结合刚玉-莫来石浇注料的性能及应用

摘要

The silica sol bonded corundum-mullite castables for ignition furnace were developed using dense corundum and mullite as aggregates,white corundum powder,α-Al2O3 micropowder and mullite powder as fines.The developed castables were applied in comparison with cement bonded corundummullite castables on the ignition furnaces of a sintering plant of Wuhan Iron and Steel (Group) Corp.The results show that:(1)the strength,volume stability,thermal shock resistance,corrosion resistance to CO of the developed castables fired at medium temperatures are all better than those of the cement bonded corundum-mullite castables; (2)the developed castables with a big one time construction thickness and a short baking period can effectively shorten the reforming period of ignition furnaces,restrain the temperature rising on furnace roof caused by leakage of coal gas and hot wind due to lining cracks,and can relieve slag adhering and spalling of linings,prolonging the service life of linings.%以致密刚玉、莫来石为骨料,以白刚玉粉、α-Al2O3微粉及莫来石粉为细粉,研制了点火炉用硅溶胶结合刚玉-莫来石浇注料,并在武汉钢铁集团烧结厂点火炉改造中与水泥结合刚玉-莫来石浇注料进行了实际应用对比.结果表明:1)硅溶胶结合刚玉-莫来石浇注料中温处理后的强度、体积稳定性、抗热震性、抗CO侵蚀均优于水泥结合浇注料的.2)硅溶胶结合刚玉-莫来石浇注料的一次性施工厚度大,可快速烘烤,能有效缩短点火炉改造时间；而且能有效降低因衬体开裂,使煤气、热风窜漏而导致的炉顶温度升高,同时使炉衬挂渣、剥落的现象减轻,从而有望提高炉衬的使用寿命.