MgO含量對高爐終渣流動性之影響

Effect of Magnesium Oxide Content on the Final Slag Fluidity of Blast Furnace

蕭嘉賢(J.S. Shiau) ； 劉世賢(S.H. Liu)

《鑛冶：中國鑛冶工程學會會刊》 52卷1期 (2008/03) Pp. 44-50

https://doi.org/10.30069/MM.200803_52(1).0003

摘要

低高爐MgO終渣可以降低爐渣量與成本。因此，為探討MgO含量對高爐終渣流動性之影響，本研究分別以高溫光學軟熔溫度量測儀與高溫黏度計，進行半合成爐渣的液化溫度與黏度量測。實驗數據經迴歸計算可建立等液化溫度與等黏度相圖。實驗結果顯示於MgO＝5.4％，Al_2O_3＝15％，B2＝1.2時，高爐終渣有較低液化溫度，且其黏度對操作溫度有較好的穩定性，而觀察終渣流動性相圖可知在MgO＝5～9％，Al_2O_3＝15％，B2＝1.0～1.2時，液化溫度隨MgO下降而降低，且黏度不受MgO含量的影響。因此建議在爐況穩定、高爐熱時，MgO含量可降低至5.4％，此成果已應用試行於中鋼現場。

關鍵字

MgO ； 高爐終渣 ； 流動性

並列摘要

The objective of this study was to understand the effect of magnesium oxide content on the fluidity of blast furnace final slag. The liquidus temperature and viscosity of a semi-synthetic slag were measured using an optical softening temperature device and a viscometer, respectively, and the data were used to develop iso-liquidus temperature and iso-viscosity diagrams. The results indicated that lower liquidus temperature and better viscosity stability were found in the area near MgO=5.4%, Al_2O_3=15%, and B2=1.2 for the compositions studied. Two important observations from the iso-fluidity diagrams of the blast furnace final slag are (1) in the area near MgO=5-9%, Al_2O_3=15%, B2=1.0-1.2 the liquid temperature decreases with a decrease in MgO content and (2) the viscosity of slag is independent of MgO content. This study suggests that the MgO content can be lowered from 6.5% to 5.4% when a stable blast furnace operation is under a high temperature level. This suggestion has been accepted in the current blast furnace operations.

並列關鍵字

MgO ； BF Final Slag ； Fluidity