酒钢镜铁矿悬浮磁化焙烧试验研究

Experimental Study on Suspension Magnetization Roasting of Jiugang Specularite

酒钢选烧厂竖炉给矿铁品位为33.84%,有用铁矿物主要为镜铁矿、褐铁矿、菱铁矿,脉石矿物主要为石英,有害元素P含量较低。针对酒钢镜铁矿采用常规选矿方法选别指标差的问题,采用磁化焙烧—磨矿—弱磁选流程法对有代表性试样进行选别试验研究。结果表明:在焙烧温度650℃、焙烧时间5 min、CO浓度30%、总气体流量500 m L/min条件下进行磁化焙烧,焙烧产品磨细至-0.074 mm占82%,在磁场强度为119.4 kA/m条件下经过弱磁选,精矿铁品位可以达到59.12%、铁回收率为81.31%,精矿中主要有害杂质Al2O3和P含量都较低,达到冶炼原料的要求。研究结果为酒钢镜铁矿的开发利用提供了依据,并对同类型矿石的开发利用具有指导意义。

There is 33.84% iron in feeding of vertical furnace in Jiugang Plant,main useful iron ores are specularite,li?monite,siderite,gangue minerals are mainly quartz,and the content of harmful element P is low. In order to solve the prob?lem of poor separation index of Jiugang specularite by conventional separation method,the magnetic roasting-grinding-low in?tensity magnetic separation method was used to the study on representative sample. Results show that the concentrate with iron grade 59.12%,and iron recovery of 81.31% can obtained under the conditions of roasting temperature 650 ℃,roasting time 5 min,CO concentration 30%,total gas volume 500 mL/min for magnetizing roasting,the roasted products ground to82% of-0.074 mm,via low intensity magnetic separation in 119.4 kA/m. The main harmful impurities Al2 O3 and P in concen?trate is relatively lower,and can meet the requirements of smelting raw materials. The research conclusion provided a basis for the development and utilization of Jiugang specularite ore,and has guiding significance for the development and utilization of the same type of ore.