东鞍山铁矿混磁精矿悬浮焙烧—弱磁选试验研究

Experimental Study on Suspension Roasting-Low Intensity Magnetic Separation of Magnetic Mixed Concentrate from Donganshan

磁化焙烧技术是处理难选铁矿资源典型、有效的方法。采用实验室间歇式悬浮焙烧炉,以高纯N2和H2的混合气体作为还原气体,在气体流量为8 m3/h、H2浓度为30%、焙烧温度为650℃、焙烧时间为8 s条件下,对东鞍山铁矿铁品位为43.92%为的混磁精矿进行悬浮焙烧,焙烧产品磨细至-0.038 mm占85%,在磁场强度为80 k A/m条件下弱磁选,获得了铁品位为65.48%、回收率为88.26%的精矿。为我国含碳酸盐铁矿资源的高效利用提供了新途径。

Magnetizing roasting pretreatment has been proven as a typical and effective method for the beneficiation of refractory iron ores. Magnetizing roasting via a laboratory-batch scale fluidized reactor was carried out for the beneficiation of a carbonates-bearing hematite ore,and it was performed under mixed H2 and N2atmosphere. The optimized conditions were determined as gas flow 8 m3/ h,hydrogen concentration 30%,roasting temperature 650 ℃ and reduction time 8 s. The roasted products ground to 85%-0. 038 mm,via low intensity magnetic separation at field intensity of 80 k A / m,iron concentrate containing 65. 48% Fe and recovery of 88. 26% was achieved. The results provided a new way for the efficient utilization of carbonates-bearing hematite iron ores.