以配料方式提升高爐原料之軟化熔融性質

Controlling Material Composition to Improve the Softening and Melting Properties of Balst Furnace Burden Materials

謝立恆(Li-Heng Hsieh) ； 劉國忠(Kuo-Chung Liu)

《鑛冶：中國鑛冶工程學會會刊》 41卷3期 (1997/09) Pp. 112-121

https://doi.org/10.30069/MM.199709_41(3).0013

摘要

本研究依據中鋼高爐之用料狀況，使用可模擬高爐內部反應之軟化熔融試驗設備，探討由配料方式提升高爐原料軟熔性質之方法，俾改善高爐之軟熔帶。主要研究結果如下：中鋼所生產燒結礦之軟化溫度頗高，滴落率及高溫透氣性則較差。燒結礦之高溫透氣性升高時，有利於高爐下部之透氣性。燒結礦之高溫透氣性與其化學成份及生成Slag之熔點有關；降低鹽基度（CaO／SiO_2）及提高MgO或Al_2O_3含量，皆有利於提升燒結礦之高溫透氣性。在燒結礦中添加少量小塊焦炭（如1.5%），亦有利於其高溫透氣性，但添加過高時（如3%），則可能產生反效果。在塊礦或Acid pellet（酸性球結礦）中添加少量小塊焦炭（1.5至3%）、白雲石（6至12%）或蛇紋石（12%），皆可改善其軟熔性質。添加量過高時，進一步改善之效果趨緩。比照中鋼高爐配料之狀況，將燒結礦（60至80%）、Acid pellet （0至20%）與塊礦（20%）混合時，各混合原料皆有頗佳之軟熔性質，不但可消除塊礦及Acid pellet軟熔性質之缺點，且可明顯提升燒結礦之高溫透氣性。其中以燒結礦65%、Acid pellet 15%及塊礦20%之混合原料略優於其他配料，具有最佳之軟熔性質。

關鍵字

高爐 ； 燒結礦 ； 球結礦 ； 塊鐵礦 ； 軟熔性質

並列摘要

The burden materials were tested with an apparatus which simulated the conditions in a blast furnace. The effect of material composition on the softening and melting properties of the burden materials was studied in order to improve the cohesive zone in the blast furnace. The sinter produced at CSC possesses high softening temperature (around 1400°C) but may possess poor high temperature permeability. Decrease in basicity (CaO/SiO_2) and increase in Al_2O_3 or MgO content in the sinter favour the high temperature permeability. Addition of a small amount of Small-size coke (e.g. 1.5%) to the sinter can improve the high temperature permeability, while too much addition may cause a reverse effect. The lump ore or acid pellet has the problems of low softening temperature and low permeability in the softening and melting stage. These problems can be overcome by adding a small amount of Small-size coke (1.5 to 3%), dolomite (6 to 12%), or serpentine (12%). Further addition of these additives does not result in much further improvement. Mixing of ferrous burdens improves their softening and melting properties. The mixtures containing 60 to 80% sinter, 0 to 20% acid pellet and 20% lump ore exhibit much better properties than the individual sinter, acid pellet or lump ore. Among these mixtures, the one containing 65% sinter, 20% lump ore and 15% acid pellet exhibits the optimum properties, that is slightly better than the other compositions.

並列關鍵字

Blast furnaxe ； Sinter ； Peller ； Lump ore ； Softening and melting properties