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应用化学分析、扫描电镜观察和X射线衍射分析方法研究海砂矿的基础物性.采用煤基深度还原-磁选工艺,系统考察矿粉中Fe和Ti的还原分离行为,并明确还原温度、还原时间、碳氧比、磁感应强度和磨矿粒度对还原磁选效果的影响规律.结果表明:海砂矿主要由钛磁铁矿和钛赤铁矿组成;较优的还原分离工艺参数为还原温度1300℃、还原时间30 min、碳氧摩尔比1.1、磁感应强度50 mT和磨矿细度-0.074 mm质量分数86.34%.在此工艺条件下,可以获得金属化率94.23%的还原产物,磁选指标分别达到精矿铁品位97.19%和尾矿钛品位57.94%,对应的铁、钛回收率为90.28%和87.22%,有效地实现海砂矿中铁钛元素的分离富集.
The basic physical properties of sea sand mine were studied by chemical analysis, scanning electron microscopy and X-ray diffraction analysis. The reduction and separation behavior of Fe and Ti in ore powder was systematically investigated by coal-based depth reduction-magnetic separation technology. The reduction temperature and reduction Time, C / O ratio, magnetic induction intensity and grinding particle size on the effect of reduction magnetic separation.The results show that the sea sand ore mainly consists of titanium magnetite and titanium hematite, and the optimum reduction and separation process parameters are the reduction temperature 1300 ℃, reduction time 30 min, molar ratio of carbon to oxygen 1.1, magnetic induction 50 mT and grinding fineness -0.074 mm mass fraction 86.34% .At the same time, a reduction of 94.23% The indexes reached 97.19% of concentrate grade and 57.94% of tailings titanium grade, respectively. The corresponding recoveries of iron and titanium were 90.28% and 87.22%, respectively, which effectively realized the separation and enrichment of iron and titanium in sea sand ore.