【摘要】：拜耳法生產(chǎn)Al_2O_3過程中產(chǎn)生的赤泥中含有大量的難回收鐵礦物,有效地回收這些鐵礦物既是對資源的高效利用,又有利于減少污染物排放。采用強磁選預富集—深度還原—弱磁選工藝對鐵品位為39.42%的山東某拜爾法赤泥進行了選鐵試驗。結(jié)果表明:在磨礦細度為-0.074 mm占80.75%,強磁選背景磁感應場強為1.2 T情況下,可獲得鐵品位為52.89%、鐵回收率為59.85%的強磁選預富集精礦;強磁選預富集精礦在煙煤用量為24.27%(煙煤與強磁選預富集精礦的質(zhì)量比),深度還原溫度為1 300℃、時間為45 min,還原焙燒產(chǎn)物磨礦細度為-0.074 mm占38%,弱磁選磁場強度為72.03 k A/m情況下,可得到鐵品位為91.25%,鐵作業(yè)回收率為96.90%、對赤泥回收率為57.99%的金屬鐵粉,較好地實現(xiàn)了赤泥中鐵礦物的回收。試驗確定的工藝簡單、穩(wěn)定、可靠,有較高的工業(yè)應用價值。
[Abstract]:Red mud produced by Bayer process in the production of Al_2O_3 contains a large amount of refractory iron ore, which is not only the efficient utilization of resources, but also conducive to reducing the emission of pollutants. An iron separation experiment was carried out on a Bayer red mud with iron grade of 39.42% by using the process of strong magnetic separation preconcentration, deep reduction and weak magnetic separation. The results show that when the grinding fineness is-0.074 mm, the magnetic induction field intensity is 1.2T, the iron grade is 52.89 and the iron recovery is 59.85%. When the concentration of bituminous coal is 24.27% (mass ratio of bituminous coal to preconcentration concentrate), the depth reduction temperature is 1 300 鈩，

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