Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11428
標題: 環保回收渣再利用於煉鋼脫磷試驗之研究
A study on dephosphorization during steel-making by using an recycled slag
作者: 陳志宏
Chen, Jhih-Hong
關鍵字: 精煉渣
ladle slag
爐渣
煉鋼
脫磷
slag
steel-making
dephosphorization
出版社: 材料科學與工程學系所
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摘要: 本研究之目的為開發新型再利用脫磷劑,使用回收之精煉爐還原渣與補充之生石灰調配出多組脫磷劑配方,利用X光射線螢光分析儀(XRF)、濕式分析、X光繞射分析(XRD)、熱差分析儀(DTA)、火花放電式成分分析儀(Spark)、掃描式電子顯微鏡(SEM)等方法,探討不同成分配比下之脫磷劑對於煉鋼脫磷試驗之影響。藉此研究評估精煉爐還原渣回爐再利用之可行性。 實驗結果顯示,隨著生石灰含量添加越多,鋼錠脫磷率越高,100 wt.%精煉爐還原渣本身之脫磷能力有限,鋼錠脫磷率僅約13 %。但若添加25 wt.%生石灰進入脫磷劑時,鋼錠脫磷率即超過60 %。脫磷劑之優劣取決於其F-CaO之含量,高F-CaO含量將擁有較佳之脫磷效果,經由以上分析方法得知,鋼錠脫磷率與脫磷劑F-CaO關係式為: Dephosphorization ratio(%) =-67.1926e ([F.CaO% ]⁄12.35942 ) +74.54785 另外發現,隨著脫磷劑中生石灰含量過多時將導致爐襯材料中Al2O3的大量溶入,進而產生回磷的現象。藉由精煉爐還原渣與生石灰適當調配過之脫磷劑不僅可以快速液化,也擁有不錯之脫磷能力,減少回磷的發生,同時也可以回收精煉爐還原渣,減少對環境的傷害與能源的浪費。
A new dephosphorization agent was developed by mixing different amount of recycled ladle furnace slag and lime. Different agents were experimented on 50Kg molten iron in an induction furnace, and each agents and slag were examined using X-ray fluorescence analyzer (XRF), chemical titration analysis, X-ray diffraction (XRD), differential thermal analysis (DTA), a spark discharge component analysis spectrometer (Spark) and scanning electron microscopy (SEM). Effect of different recycled slag and lime ratio on dephosphorization during steelmaking was examined, and the feasibility using recycled slag in steelmaking was discussed. Experimental results show that dephosphorization increase as lime content increases in the agent. The agent with 100 wt% recycled ladle furnace slag has only 13% dephosphorization ratio. As the amount of lime increases to 25 wt%, the agent shows more than 60% dephosphorization ratio. Discussions reveal that the amount of F-CaO affects the dephosphorization behavior. The higher F-CaO content in dephosphorization agent, the better dephosphorization results, and the relation between dephosphorization ratio and F-CaO is: Dephosphorization ratio(%) =-67.1926e ([F.CaO% ]⁄12.35942 ) +74.54785 It was also discovered that more Al2O3 was drawn into molten steel with increasing lime content in dephosphorization agent. It will lead to rephosphorization phenomenon during steel making. Blending recycled slag and lime properly can promote liquefaction of dephosphorization agent, improve dephosphorization ability, lower the probability of rephosphorization and reduce damage to the environment.
URI: http://hdl.handle.net/11455/11428
其他識別: U0005-2407201311140000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2407201311140000
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