高炉用Al2O3-SiC-C质铁沟浇注料高温性能低主要与水泥、硅微粉的加入量有关,以棕刚玉、碳化硅等为主要原料,研究了硅微粉、水泥加入量对浇注料强度的影响,研究结果表明:通过采用高铝80水泥代替原用70水泥并适当降低两者的加入量,可以保证材料的常温强度不下降的前提下,显著提高高温抗折强度,其原因在于形成了发育良好的莫来石晶体,将该技术在1080 m3高炉的铁沟使用,通铁量提高3.8万吨,取得了良好的使用效果.
The lower high temperature performance of Al2O3-SiC-C castables for blast furnace trough is mainly related to the additions of cement and microsilica powder.The effect of microsilica powder and cement content on the strength of the castables was investigated using brown corundum, silicon carbide as main raw materials.The results show that using high alumina 80 cement instead of the original 70 cement and reducing the addition amount,could improve the hot modulus of rupture significantly without decreasing the coldstrength due to the formation of the well-developedmullite crystal.The technology was applied to a blast furnace of 1080 m3 capacity.The iron influx was increased by 38 thousand tons and a good effect was achieved.
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