炭素原料对Al_2O_3-SiC-C铁沟浇注料性能的影响

Effects of carbon materials on properties of Al_2O_3-SiC-C iron trough castables

以棕刚玉、碳化硅、铝酸盐水泥及超微粉等为原料制备了棕刚玉基Al2O3-SiC-C铁沟浇注料,研究了球状沥青加入量对其性能的影响,并确定了球状沥青的最佳加入量;在此基础上,进一步研究了鳞片石墨外加量对该浇注料性能的影响。结果表明:随着球状沥青加入量的增加,浇注料的需水量增加,体积密度减小,显气孔率升高,强度降低,抗渣侵蚀性先提高后降低;当球状沥青加入质量分数为3%时,浇注料需水量增加的幅度与强度降低的幅度并不明显,且抗渣侵蚀性最好;在球状沥青加入质量分数为3%的前提下,外加质量分数0.5%的鳞片石墨可使该浇注料的强度略有增加,抗渣侵蚀性进一步提高,但鳞片石墨质量分数超过0.5%后,反而使浇注料的需水量增大,显气孔率升高,强度降低,抗渣侵蚀性变差。现场使用效果表明,以3%质量分数的球状沥青配合0.5%质量分数的鳞片石墨作为炭素原料制备的棕刚玉基Al2O3-SiC-C铁沟浇注料,具有施工性好,易烘烤,性能优良,质量可靠的优点,在大型高炉出铁场上使用,其一次通铁量可达到19.8万t。

AI2O3-SiC-C iron trough castables were prepared using brown corundum,silicon carbide,calci- um aluminate cement and ultrafine powders as starting materials. Effects of ball-pitch addition on properties of the castables were studied to determine the optimal addition. Then,effect of flake graphite extra addition on properties of the castables was also investigated. The results show that with the ball-pitch addition in- creasing, the water demand and apparent porosity increase ,the bulk density and cold strengths decrease, the slag corrosion resistance deteriorates after improving; while when the ball-pitch addition is 3% （in mass,the same hereinafter）, the water demand increase and the strength reduction are not obvious, but good slag corrosion resistance is obtained ;under the condition of adding 3% ball-pitch,O. 5% flake graph- ite （extra added） can enhance the strength slightly and improve the slag corrosion resistance further; when the flake graphite exceeds O. 5% ,the water demand and apparent porosity increase,the strength de- creases and the slag corrosion resistance deteriorates. The on site application showed that the brown co- rundum based AI2Q3-SiC-C castables with 3% ball-pitch in combination with O. 5% flake graphite as car- bon materials perform good workability, easy baking property, excellent performance and reliable quality. When used in casting house of large-scaled blast furnaces, the once hot metal throughput reached ]98 thousand tons.