尖晶石在Al_2O_3-Spinel及Al_2O_3-MgO耐火混凝土抗渣性中之功能

Role of Spinel in the Slag Resistance of Al_2O_3-Spinel and Al_2O_3-MgO Castables

柯允超(Yung-Chao Ko)

《鑛冶：中國鑛冶工程學會會刊》 46卷2期 (2002/06) Pp. 148-154

https://doi.org/10.30069/MM.200206_46(2).0012

摘要

Al_2O_3-Spinel，Al_2O_3-MgO及High-Al_2O_3諸混凝土的抗渣性，以氣體燃燒旋轉式爐渣試驗爐測試，並使用轉爐渣（CaO／SiO_2＝3.8，Fe_2O_3＝33.4%）。三種Al_2O_3-Spinel混凝土使用同量各含73，90及94wt%Al_2O_3富鋁尖晶石。由75wt%轉爐渣及25wt%富鋁尖晶石組成的混合粉體，升溫至1400℃或1500℃，即行爐內自然冷卻，過夜取出。XRD圖形無法鑑定這些再熔過的爐渣中仍有尖晶石存在。同一混合粉體亦用在固滴測試（Sessile Drop Test），其基材為預燒過的Al_2O_3-Spinel混凝土。實驗結果顯示混凝土的抗渣性，隨源自尖晶石MgO含量的增加而增加；尖晶石在混凝土抗渣性中之功能是尖晶石熔入滲透進去的爐渣，以阻擋爐渣繼續滲透。

關鍵字

尖晶石不穩定性 ； MgO含量 ； 熔入 ； 接觸角

並列摘要

The slag resistance of Al_2O_3-spinel, Al2_O_3-MgO and high-Al_2O_3 castables was tested using a gas-fired rotary slag test furnace and BOF slag (CaO/SiO_2 = 3.8, Fe_2O_3 = 33.4wt%). The spinels used in the test contained 73, 90 and 94 wt% Al_2O_3. The XRD patterns showed that no spinels can be identified in the mixes consisting of 75 wt% BOF slag +25wt% spinel and being fired up to 1400° or 1500°C. The same mixes were used for a sessile drop test using a prefired Al_2O_3-spinel castable as a substrate. The experimental results indicate that the penetration decreases with increasing the MgO content in spinels. The role of spinel composition in the slag resistance of Al_2O_3-spinel and Al_2O_3-MgO castables is to dissolve itself in the penetrating slag and as a result to lessen the peneatration.

並列關鍵字

Spinel instability ； MgO content ； Dissolution ； Contact angle