鐵礦泥為鋼鐵業高爐製程空氣污染防治設備之洗塵水副產物，因鐵、碳含量高利於替代廠內製程生料使用，但因含微量鉛、鋅使得用量有所限制。然而，鐵為鐵氧磁體之基材，且碳可於惰性環境下促使鐵礦泥還原轉化為鐵氧磁體，使鐵礦泥具有鐵氧磁體化之潛勢。本研究主要藉由XRD晶相定性及半定量等分析探討燒結氣氛、溫度及持溫時間等燒結條件對於鐵礦泥進行鐵氧磁體化之影響。
鐵礦泥於空氣氣氛下，當燒結溫度由600ºC逐漸增加至900ºC，由XRD晶相半定量分析觀察得α-Fe2O3晶相相對強度持續增加，得知鐵礦泥隨溫度增加而持續進行氧化反應。於氮氣氣氛下，鐵礦泥因含碳量高，有助於爐內形成還原環境，當燒結溫度增加為700ºC~800ºC，鐵礦泥燒結產物之Fe3O4晶相相對強度可得最大值；但隨著溫度及持溫時間增加，Fe3O4晶相相對強度開始下降，FeO晶相相對強度則開始增加，得知鐵礦泥隨溫度及持溫時間增加而持續進行還原反應。歸納實驗結果可知，使用含碳量較低之鐵礦泥壓錠後進樣，於氮氣環境下800ºC燒結五小時，為鐵礦泥轉化為鐵氧磁體之最佳操作條件。
鐵礦泥經鐵氧磁體化程序，除可產出具有磁性及吸附性等特性之資材化物質，並可富集回收含有Zn及Pb等重金屬之析出物，可增進鐵礦泥再利用潛勢，提供鐵礦泥另一多元資材化方向。

Blast furnace (BF) slurry, a solid by-product with high iron and carbon contents, could originally be recycled in the steel making process. Limited that the zinc and lead contents might evaporate in elevated temperature; the recycling of BF slurry is constrained. Nevertheless, iron content in BF slurry is basic material of ferrite, and carbon could provide reduced atmosphere and convert iron to ferrite in high temperature ferrite process. In this study, quantitative X-ray diffraction analysis was performed to investigate the influence of sintering conditions including atmosphere, sintering temperature and isothermal time on the ferrite process of BF slurry.
When the sintering temperature was increased from 600ºC to 900ºC under air atmosphere, Relative Intensity to Reference (RIR) of α-Fe2O3 in sintered BF slurry increased accordingly. The result supports that the oxide number of iron oxide is raised under the air atmosphere during the sintering process. On the other hand, as the sintering temperature was in the range from 700ºC to 800ºC under nitrogen atmosphere, the RIR of Fe3O4 reached maximum value. Afterward, as the temperature or the isothermal time was further increased, the RIR of FeO increased and the RIR of Fe3O4 decreased. The results indicate that the oxide number is reduced in elevated temperatures under the reduced atmosphere created by carbon in BF slurry and nitrogen atmosphere. Summarized from the experiments performed, the optimal sintering condition for ferrite process of the BF slurry is palletized sintering at 800 ºC for 5 hours under nitrogen atmosphere.

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