Abstract:

Corundum spinel castables were prepared with tabular corundum particles (6-3,3-1,and ≤1 mm) and fine powder (≤0.045 mm),fused spinel particles (≤1 mm) and fine powder (≤0.045 mm),sintered spinel particles (≤1 mm) and fine powder (≤0.045 mm),active spinel micropowder (d₅₀=1.82 μm),active α-Al₂O₃ micropowder (d₅₀=1.68 μm),Secar 71 cement as raw materials.The effects of different spinels (fused spinel,sintered spinel,sintered spinel+active spinel) on the properties of castables were studied.The results show that:(1)the introduction of different spinels into corundum-spinel castables has little effect on the modulus of rupture and compressive strength of the sample after drying at 110 ℃ for 24 h,but fused spinel can reduce the amount of water,improve the fluidity and obtain excellent construction performance;(2)fused spinel improves the slag corrosion resistance of the material,and sintered spinel is favorable for the slag penetration resistance and the thermal shock resistance;(3)adding an appropriate amount of active spinel powder offsets the shortage of sintered spinel and improves the workability,but has a certain negative impact on the thermal shock resistance.

Key words: corundum-spinel castables, spinel, strength, thermal shock resistance, slag resistance

摘要：

采用板状刚玉颗粒(6~3、3~1、≤1 mm)及细粉(0.045 mm)、电熔尖晶石颗粒(≤1 mm)及细粉(0.045 mm)、烧结尖晶石颗粒(≤1 mm)及细粉(0.045 mm)、活性尖晶石微粉(d₅₀=1.82 μm)、活性α-Al₂O₃微粉(d₅₀=1.68 μm)、Secar 71水泥等原料制备了刚玉-尖晶石浇注料。研究了不同种类尖晶石(电熔尖晶石、烧结尖晶石、烧结尖晶石+活性尖晶石)对浇注料性能的影响。结果表明:1)在刚玉-尖晶石浇注料中引入不同的尖晶石对试样经110 ℃保温24 h烘干后的抗折强度和耐压强度影响不大,但采用电熔尖晶石能降低加水量,提高流动性,得到优良的施工性能;2)采用电熔尖晶石有利于材料的抗渣侵蚀性能,但在抗渣渗透性及抗热震性方面,烧结尖晶石更占优势;3)加入适量的活性尖晶石微粉可以弥补烧结尖晶石的不足,提高浇注料的可施工性能,但对抗热震性会产生一定负面影响。

关键词: 刚玉-尖晶石浇注料, 尖晶石, 强度, 抗热震性, 抗渣性