酒钢-1mm镜铁矿粉矿微波磁化焙烧—弱磁选试验

鉴于酒钢-1 mm镜铁矿粉矿采用常规选矿方法难以获得好的分选指标,进行常规磁化焙烧—弱磁选又需解决球团问题,以哈密烟煤为还原剂,对该粉矿开展了微波磁化焙烧—弱磁选研究,考察了煤粉用量、微波功率、焙烧温度、焙烧时间、焙烧产品磨矿细度和弱磁选磁场强度对所获铁精矿指标的影响。试验结果表明,在煤粉与矿石的质量比为5%、微波功率为1 k W、焙烧温度为550℃条件下将该粉矿微波磁化焙烧15 min,然后将焙烧矿磨细至-0.074 mm占85.65%,在92.16 k A/m磁场强度下进行1次磁选管选别,可获得铁精矿铁品位为55.10%、铁回收率为86.65%的较好指标,从而为该-1 mm镜铁矿粉矿中铁矿物的高效回收提供了一种新思路。

Experiment of the Process of Microwave Magnetization Roasting and Low Intensity Magnetic Separation for Fine Specularite at -1 mm of Jiugang

It is hard to obtain good separation index for the specularite at -1 mm in Jiugang company by conventional beneficiation process.In the conventional magnetic roasting-low intensity magnetic separation，the problem of pellets has to be solved.With Hami bituminous coal as reducing agent，the process of the microwave magnetization roasting-low intensity magnetic separation study for fine ore is carried out to investigate the effect of the dosage of pulverized coal，microwave power，roasting temperature，roasting time，grinding fineness of roasted products and low intensity magnetic field strength on the iron concentrate indexes.The test results showed that under the conditions of the mass ratio of pulverized coal to ore 5%，microwave power 1 kW，and calcined at 550 ℃，the raw fine ores were treated by the microwave magnetizing roasting for 15 min，and then the roasted products are ground to the fineness of -0.074 mm 85.65%.By this method，good indicators of iron concentrate with Fe grade of 55.10% and Fe recovery of 86.65% was achieved by adopting one-stage magnetic tube separation with magnetic field strength of 92.16 kA/m.The research provides a new idea for high efficient recovery of iron ore from fine specularite at -1 mm.