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海砂礦深度還原-磁選分離實驗研究

Experimental research on the deep reduction-magnetic separation of ironsand

  • 摘要: 應用化學分析、掃描電鏡觀察和X射線衍射分析方法研究海砂礦的基礎物性.采用煤基深度還原-磁選工藝,系統考察礦粉中Fe和Ti的還原分離行為,并明確還原溫度、還原時間、碳氧比、磁感應強度和磨礦粒度對還原磁選效果的影響規律.結果表明:海砂礦主要由鈦磁鐵礦和鈦赤鐵礦組成;較優的還原分離工藝參數為還原溫度1300℃、還原時間30 min、碳氧摩爾比1.1、磁感應強度50 mT和磨礦細度-0.074 mm質量分數86.34%.在此工藝條件下,可以獲得金屬化率94.23%的還原產物,磁選指標分別達到精礦鐵品位97.19%和尾礦鈦品位57.94%,對應的鐵、鈦回收率為90.28%和87.22%,有效地實現海砂礦中鐵鈦元素的分離富集.

     

    Abstract: The basic characteristics of ironsand were systematically studied by chemical analysis, scanning electron microscopy and X-ray diffraction. A series of experiments were performed to investigate reduction-magnetic separation for Fe and Ti from iron-sand. The effects of reduction temperature, reduction time, carbon ratio, magnetic density, and grinding fineness on the reduction-magnetic separation process were investigated. It could be found that the ironsand mainly consisted of titanomagnetite and titanohematite. The optimal process parameters were obtained as follows:reduction temperature, 1300℃; reduction time, 30 min; C/O molar ratio, 1.1; magnetic density, 50 mT; and the grinding fineness of -0. 074 μm, 86. 34%. Under such conditions, the metallization rate, the iron grade of magnetic substance and the iron recovery reached to 94.23%, 97.19% and 90. 28%, respectively, and the titanium grade of non-magnetic substance and the titanium recovery were 57. 94% and 87.22%, respectively. The effective separation of iron and titanium could be achieved in this reduction-magnetic separation process.

     

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