材料期刊网

摘 要：磁化焙烧技术是处理低品位褐铁矿最有效的手段之一。为解决现有磁化焙烧工艺存在的能耗高、效率低、焙烧质量差等问题，试验以湖北黄梅褐铁矿为主要原料，进行了悬浮闪速磁化焙烧试验研究。在此基础上，进行了中高温闪速磁化焙烧褐铁矿的试验，研究焙烧气氛、温度和固气比等操作条件对褐铁矿焙烧指标的影响，找出了使精矿品位和回收率达到最优时的最佳操作参数。结果表明：在CO含量3.50%左右，反应炉温度800～950 ℃，固气比0.5～0.8kg/Nm3条件下，通过闪速磁化焙烧得到的焙烧矿，品位在33%左右，可选性良好，采用简单的选矿流程，可得到较好的选矿指标，铁精矿品位达到60.67%，回收率达到94.49%.可见新研制的闪速磁化焙烧装置对褐铁矿的焙烧效果是很显著的。

Abstract: Magnetizing reduction is one of the most effective unit operations in the treatment of iron ores specially those which are poorly responsive to conventional beneficiation techniques. Aiming at the disadvantages of traditional magnetic roasting process on high energy consumption, low efficiency and bad roasted quality, the feasibility of magnetic roasting limonite by air suspension process was investigated. The natural limonite ores used in the experiment was from Huangmei, Hubei province. On this basis, magnetic roasting limonite by suspension process at middle-high temperature was conducted. The effects of operation parameters such as roasting atmosphere , temperature and the ratio of the iron ore weight, W(kg), to the reducing gas, V(Nm3) on the roasting indexes were analyzed. The optimical operating parameters for the concentrate of roasted ores with perfect iron grade and iron recovery were obtained. The results showed that: in the condition of the volume fraction of CO was 3.5%, the temperature was 800～950℃and the solid-gas ratio was 0.5～0.8 kg/Nm3 ，By flash magnetic roasting, the grade of roasting limonite is nearly 33%, and the feasibility of separation is effective. It could get a good index through simple flow of mineral processing, the iron grade of concentrate reach to 60.67% and the iron recovery rate reach to 94.49%. It is reveal that the new created flash magnetic roasting device had an obvious effect on roasting limonite.