关键词: 刚玉-尖晶石浇注料, 尖晶石, 强度, 抗热震性, 抗渣性

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