Roasting reduction-magnetic separation technology of Xuaniong-type iron ore and its relevant influencing factors
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摘要: 基于煤基焙燒還原-磁選工藝,進行了宣龍式難選鮞狀赤鐵礦石提鐵過程及其影響因素的實驗研究.以鐵精礦品位和鐵回收率為評價指標,確定了適合于該類礦石的最佳工藝條件:焙燒還原溫度為1 200℃,還原劑用量為30%,焙燒還原時間為60min,焙燒產物磁選前的磨礦細度為-45μm占96.19%,磁選的磁場強度為111kA·m-1.在該工藝條件下,可以使鐵精礦品位達到92.53%,鐵回收率達到90.78%.Abstract: Coal-based roasting reduction-magnetic separation technology for iron extraction from Xuanlong-type iron ores and its relevant influencing factors were investigated. An optimal technological condition for iron extraction from the iron ores was determined with iron concentrate grade and iron recovery rate as evaluation indices. The results show that the iron concentrate grade of 92.53% and the iron recovery rate of 90. 78% can be obtained when the reductant dosage is 30%, the roasting temperature is 1 200℃, the reduction time is 60 min, the percentage of roasting products with a grinding fineness of -45 μm is 96. 19%, and the magnetic field intensity is 111 kA·m-1.
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Key words:
- iron ores /
- beneficiation /
- hematite /
- ore roasting /
- ore reduction /
- magnetic separation
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