鐵水中噴吹碳粉種類對溶解速率的影響研究

近年來，一種替代的煉鐵製程，是利用頁岩氣和碳熱還原鐵礦來生產直接還原鐵DRI；另一方面，廢鋼量不斷增加，將成為另一個生產鋼鐵的重要原料來源。因此轉爐利用廢鋼和DRI生產鋼液或鐵水的製程技術已受到關注，為了適化轉爐熔煉廢鋼生產鐵水的製程，有兩個重要問題必須確認：一是固態廢鋼融化速率及其影響因素；另一是鐵水增碳時，碳的溶解及其影響因素。因此本研究解析各類碳源粉粒在鐵水中的溶解反應，以及探討製程條件對碳源溶解速率和收得率的影響。實驗結果顯示：(a)在鐵水碳含量4%以下，三種碳源在鐵水中的碳溶解與時間皆為線性關係，也就是溶解速率為定值；(b)三種碳源的硫含量高，鐵水中的硫含量也隨時間作線性變化；(c)三種碳源材料在相同實驗條件下，以增碳劑的溶解速率最快且碳收得率最高。研究結果未來可應用於新開發的轉爐廢鋼熔解製程(CSMP)中。

關鍵字

煉鐵；廢鋼熔解製程；增碳溶解

並列摘要

In recent years, as an alternative ironmaking process, the reduction of iron ore by carbothermic reduction or shell gas to produce direct reduced iron (DRI) is being developed in the attempts to replace BF. On the other hand, the amount of steel scrap increases continuously and becomes another important raw material for the steel production. Recently, the production of steel from scrap and DRI by BOF process has attracted the attentions. Two important issues must be acknowledged: One is the solid scrap melting rate and its influencing factors; another is carbon dissolved into hot metal and its influencing factors. Therefore, the dissolving reaction of some kinds of carbon powder in the hot metal was studied as well as the effects of process conditions on the carbon dissolution rate and yield were investigated. The results showed that: (a) When the carbon content is less than 4% in hot metal, the amount of carbon dissolving into hot metal is linearly increasing with time. That is, the carbon dissolution rate is constant. (b) The sulfur content in the hot metal is also linearly increasing during the blowing period because the sulfur contents of these carbon sources are high. (c) The dissolution rate of the recarburizer is the fastest and the yield is the highest among these three carbon source material under the same experimental conditions. The results of this study will be applied in the future technology development of China Steel smart melting process (CSMP) in the new converter.

並列關鍵字

ironmaking ； scrap melting process ； carbon dissolution

國際替代計量

鐵水中噴吹碳粉種類對溶解速率的影響研究

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