鎂鋁尖晶石的特質對氧化鋁－氧化鎂及氧化鋁－尖晶石耐火混凝土抗渣性的影響

Influence of the Characteristics of Spinels on the Slag Resistance of Al_2O_3-MgO and Al_2O_3-Spinel Castables

柯允超(Yung-Chao Ko)

《鑛冶：中國鑛冶工程學會會刊》 45卷1期 (2001/03) Pp. 99-104+112

https://doi.org/10.30069/MM.200103_45(1).0009

摘要

室溫及1500℃ X光撓射（XRD）圖形顯示：氧化鋁－氧化鎂混凝土經1500℃燒製3小時後，其尖晶石強度比諸氧化鋁－尖晶石混凝土都強。此氧化鋁－氧化鎂以及使用73，90及94wt%Al_2O_3尖晶石的諸氧化鋁－尖晶石混凝土，經燒製之後，所有尖晶石的d_(311)值皆2.43°，所有尖晶石的氧化鋁含量皆75wt%。室溫及1500℃ XRD圖形更進一步顯示：只有燒過的氧化鋁－氧化鎂混凝土中的尖晶石在1500℃發生再結晶，同樣燒過的氧化鋁－尖晶石混凝土中的尖晶石在1500℃未發生再結晶。發生再結晶的原因是氧化鋁－氧化鎂混凝土中的新生態尖晶石的晶粒較細。基質中新生態尖晶石的量較多且晶粒較細是氧化鋁－氧化鎂混凝土的抗渣性較之氧化鋁－尖晶石混凝土更優越的主要原因。

關鍵字

尖晶石 ； 晶粒較細 ； 量較多 ； 抗渣性

並列摘要

The XRD patterns at ambient temperature and at 1500 °C showed that the spinel in the Al_2O_3-MgO castables fired at 1500 °C for 3 h has higher peak intensity, compared with those in Al_2O_3-spinel castables; while the interplanar distance in the set (311) is 2.43Å for the spinel in Al_2O_3-MgO castables as well as the spinels in Al_2O_3-spinel castables using spinels containing 73, 90, and 94 wt% Al_2O_3, respectively. The corresponding alumina contents of the spinels in these castables are estimated to be around 75 wt%. The smaller grain size of the spinel in Al_2O_3-MgO castables compared with that in Al_2O_3-spinel castables is evidenced by the recrystallization of the in-situ spinel only occurring in Al_2O_3-MgO castables as revealed by the XRD patterns at ambient temperature and at 1500 °C. The larger amount and smaller grain size of the in-situ spinel in the matrix mostly accounts for the better slag resistance of Al_2O_3-MgO castables, compared with Al_2O_3-spinel castables.

並列關鍵字

Spinel ； Finer grain ； Larger amount ； Slag resistance