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題 名 | 氧化鋁與二氧化矽添加對高料層鐵碳複合球團碳熱還原性能之影響=Effects of Al₂O₃ and SiO₂ Addition on Carbothermic Reduction of Ore/Coal Composite Pellets in Tall Bed |
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作 者 | 蕭嘉賢; 劉世賢; 黃聰彥; | 書刊名 | 臺灣鑛業 |
卷 期 | 69:1 2017.03[民106.03] |
頁 次 | 頁41-53 |
分類號 | 454.81 |
關鍵詞 | 高料層; 鐵碳複合球團; 碳熱還原; 氧化鋁; 二氧化矽; 金屬化率; Tall pellets bed; Ore/coal composite pellets; Carbothermic reduction; Al₂O₃; SiO₂; Metallization degree; MD; |
語 文 | 中文(Chinese) |
中文摘要 | 鐵碳複合球團於高溫受熱過程,若其渣相能部分軟熔或鐵相能高度燒結,即可使球團產生高度收縮;而渣相軟熔溫度決定於其渣系組成。本研究使用低品級鐵礦配料來產製碳熱還原鐵,以配渣設計方案提高球團收縮率,使熱傳效率良好達到高金屬化率之產品,進而建立擴大料源之配渣方案。試驗結果顯示,當 SiO2/Al2O3 (S/A)=2.0~2.2,反應後球團明顯發生熔融(液化)現象,會提高球團內發生局部渣化機會。高比例的 Al2O3添加,高料層球團整體金屬化率均 >80%,但過多 Al2O3添加會限制鐵相生長,降低球團金屬化率。由渣相圖解析發現其碳熱還原反應後的渣相液化溫度有較明顯增加的趨勢,故適量增加 Al2O3,可使球團整體渣相避開低液相溫度區,而朝向高溫液化區,增加料層整體收縮率。當反應後球團成分接近於低溫液相區,高料層之最上層球團會發生熔化現象。 |
英文摘要 | It will lead to the pellets shrinkage that the gangue is partly melted or the iron phase is highly sintered within the ore/coal composite pellets during high temperature heating procedure. In this study, in order to improve pellets heat transfer rate to obtain a high metallization degree (MD) of the tall pellets bed, the various low-grade iron ores combined design were used to produce carbothermic reduction iron depended on the slag melting temperature according to its slag chemical composition for making pellets a higher shrinkage. The experimental results indicate that the SiO2/Al2O3 (S/A) = 2.0-2.2, the pellets have an obvious phenomena of melting (liquidus) after the reduction reaction, and it increases the opportunity of local slagging occurred within the pellets. In addition, the higher Al2O3 content spread in the pellets, the MD of high tall pellets bed is larger than 80%, however, the excessive Al2O3 content will limit the growth of iron phase and reducing pellets MD. It is also found from the slag phase diagram that slag liquidus temperature has a significantly increasing trend after reaction, therefore, for increasing the shrinkage of tall pellets bed, the appropriate addition of alumina makes the overall slag within the pellets to avoid the lower liquidus temperature zone then toward to another higher liquidus temperature path at the slag phase diagram. Finally, the upper layer pellets of tall bed has a occurrence of melting when the pellets chemical composition is close to a lower liquidus temperature zone. |
本系統中英文摘要資訊取自各篇刊載內容。