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氫氣還原褐鐵礦實驗研究與動力學分析

Experimental research and kinetics analysis on hydrogen reduction of limonite

  • 摘要: 本文旨在研究不同溫度下氫氣對褐鐵礦還原度和還原速率的影響,并以此為基礎分析動力學相關問題.通過熱重分析深入了解褐鐵礦失水狀況.使用粒度為8~12 mm褐鐵礦焙燒后,分別在750~950℃五個不同溫度下使用4 L·min-1 H2進行還原,并分析還原率和還原速率隨時間的變化關系.研究發現:隨著反應進行,試樣還原率逐漸增大,五條還原率曲線在t>28 min后與還原溫度排序一致.通過動力學研究計算得反應表觀活化能E=15.323 kJ·mol-1,從而確定擴散為還原反應的限制環節.

     

    Abstract: This article presents experimental studies on the effects of H2 on the reduction degree and rate of limonite at different temperatures and kinetic analysis during the hydrogen reduction. The water loss of limonite was investigated by thermal gravimetric analysis. Limonite of 8 to 12 mm in granularity was reduced with 4 L·min-1 H2 at five temperatures of 750 to 950℃. As the reduction reaction proceeded, the reduction degree increased, and the sequence of 5 reduction degree curves was consistent with that of reaction temperature when t>28 min. The apparent activation energy was kinetically calculated to be 15.323 kJ·mol-1, so diffusion is the restrictive step of the reduction reaction.

     

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