用於製造氧化鋁－尖晶石耐火混凝土之商用鎂鋁尖晶石研究

A Study of Commercial Magnesia Alumina Spinels for Alumina-Spinel Castables

10.30069/MM.199903_43(1).0007

柯允超(Y. C. Ko)

富鋁鎂鋁尖晶石 ； 格子常數 ； 氧化鋁含量 ； 抗渣性 ； MgO-Al_2O_3 spinels ； Lattice constant ； Al_2O_3 content ； Slag resistance

鑛冶：中國鑛冶工程學會會刊

43卷1期（1999 / 03 / 01）

78 - 83

繁體中文

本研究報導6種商用合成鎂鋁尖晶石的礦物組成及尖晶石的格子常數及由此格子常數估得的尖晶石的氧化鋁含量。商用規格含94 wt％Al_2O_3燒結型尖晶石及含88wt％Al_2O_3。熔鑄型尖晶石，其規格Al_2O_3含量與由格子常數估得的AI_2O_3含量有相當大的差異；但三種商業規格含89－90wt％及一種商業規格含73wt％Al_2O_3燒結型尖晶石，其規格Al_2O_3含量與由格子常數估得的Al_2O_3含量非常接近。抗渣性實驗顯示，混凝土的抗爐渣滲透性隨由格子常數估得的Al_2O_3含量的增加而減少，但抗爐渣沖蝕性隨尖晶石的Al_2O_3含量的增加而增加，其最適Al_2O_3含量為85wt％，混凝土使用同量的89－90wt％及94wt％Al_2O_3燒結型尖晶石，其坑渣性非常接近。

The lattice constants and corresponding alumina contents of MgO-Al_2O_3 spinels, as estimated from the lattice constants, have been compiled from actual observations of six commercial spinels. A considerable discrepancy has been observed between the alumina content estimated from the lattice constant and that given in specification of the calcined spinel containing 94 % Al_2O_3 and the electrofused spinel containing 88 % Al_2O_3. However, the alumina contents of the other two samples of calcined spinels containing 89-90% and 73% Al_2O_3 as given in specification are very close to those estimated from their lattice constants. The slag test reveals that the penetration resistance of alumina-spinel castables slightly decreases, while the erosion resistance of the castables slightly increases with increase in alumina content of the spinel, as estimated from its lattice constant. The optimum alumina content of the spinel has been observed to be around 85%; and the wear resistance of the castables made by using same amounts of spinels containing 89-90% and 94% Al_2O_3, is very close.