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高鐵鋁土礦直接還原-溶出工藝

Direct reduction-leaching process for high ferric bauxite

  • 摘要: 提出了一種以Na2CO3為添加劑、以煤為還原劑的還原分離方法,將原礦中鐵的氧化物還原為鐵單質粉末通過磁選分離回收,將水鋁石礦物轉化為鋁酸鈉溶出分離回收.通過單因素實驗考察了還原溫度、還原時間、Na2CO3用量和還原劑用量對粉末鐵品位、鐵回收率和氧化鋁溶出率的影響,并用X射線衍射分析、掃描電鏡觀察和能譜分析等方法研究了反應的過程和機理.通過正交試驗優化了實驗參數,獲得的最優條件為還原溫度1150℃,還原時間45 min,Na2CO3用量40.47%,還原劑用量11.9%;在最優條件下,粉末鐵品位為95.88%,鐵回收率為89.92%,氧化鋁溶出率為75.92%.

     

    Abstract: A direct reduction method was proposed which uses soda ash as the flux and coal as the reductant. By using this method hematite is reduced to iron, which can be recovered by magnetic separation, while Al2O3 is translated into sodium aluminate, which can be recovered from the solution. The effects of reduction temperature, reduction time, Na2CO3 dosage and reductant dosage on the grade of iron powder, the recovery of iron powder and the recovery of alumina were investigated on the basis of the single factor alteration principle. The process and reaction mechanism were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Orthogonal experiments were designed for optimizing the experimental parameters. Under the optimum condition of the reduction temperature of 1 150℃, the reduction time of 45 min, the Na2CO3 dosage of 40.47% and the reduetant dosage of 11.9%, the grade of iron powder is 95.88%, the recovery of iron powder is 89.92%, and the recovery of alumina is 75.92%.

     

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