攀钢钢渣选铁试验研究

Experimental Study on Separating Iron from Steel Slag of Panzhihua Steel

攀钢钢渣含铁34.67%,主要金属矿物磁铁矿呈粒状,嵌布粒度较细。为从该钢渣中有效回收铁,分别采用单一湿式磁选和预先筛分—湿式磁选联合工艺进行选别试验。结果表明,钢渣中+5 mm粒级铁品位高达89.96%,可直接回收利用;单一湿式磁选工艺回收指标较好,但流程负荷重;预先筛分—1粗1精湿式磁选联合工艺可有效回收钢渣中金属铁粒和细粒级磁性铁,TFe回收率63.42%。其中TFe品位大于90%的金属铁粒可直接返回炼钢,TFe品位48.26%的铁精矿适用于烧结配矿,湿式磁选尾渣可用作水泥活性混合料,有效回收了钢渣中的铁,实现了炼铁钢渣资源的综合利用。

There is 34.67% iron in steel slag of Panzhihua Steel, magnetite is the main metallic minerals with grainy that dissemination size is fine. In order to recover iron from the steel slag, experi- ments were carried out by using single wet magnetic separation process and prescreening -wet magnetic separation combined process respectively. The results showed that, ＋ 5 mm size fraction in the steel slag could be recycled directly in which iron grade is as high as 89.96% , the recovery index of single wet magnetic separation process was good while the flow load is high, prescreening and one roughing-one cleaning wet magnetic separation combined process could effectively recover metal iron particles and fine- grained magnetic iron with TFe recovery rate of 63.42%. The metal iron particles could directly back to the steelmaking process of which TFe grade was more than 90% , and wet magnetic separation tailings could be used as matching ore for sintering of which grade was 48.26%. Iron in the steel slag was recov- ered effectively, and the comprehensive utilization of ironmaking steel slag resources was realized.