东鞍山烧结厂浮选尾矿选铁试验

Experimental Study on Iron Separation from Flotation Tailings in Donganshan Sintering Plant

东鞍山烧结厂浮选尾矿铁品位为29.42%,主要杂质为SiO_(2),为回收其中的铁矿物进行了一系列试验。结果表明:浮选尾矿在磨矿细度为-0.025 mm占95%的情况下,进行了1粗1精磁选,得到铁品位为48.39%的磁选精矿;磁选精矿在矿浆pH=11.5、温度为40℃,淀粉用量为900g/t,CaO用量为1100 g/t,TD-2粗选用量为500 g/t、精选用量为200 g/t情况下进行1粗2精2扫、中矿顺序返回流程反浮选,反浮选精矿TFe品位较试验原料提高了37.03个百分点,达66.45%,TFe回收率达39.29%,主要杂质SiO_(2)含量由42.56%降至2.35%,达到了理想的铁回收效果。

The iron grade of flotation tailings of Donganshan Sintering Plant is 29.42%,in which the main impurity is SiO_(2).A series of experiments has been carried out to recover the iron minerals.The results showed that the magnetic concentrate with iron grade of 48.39%was obtained with one roughing-one cleaning magnetic separation when the grinding fineness of-0.025 mm was accounting for 95%.One roughing,two cleaning,two scavenging,and middlings sequence return process was adopted under the condition of pulp pH of 11.5,temperature of 40℃,starch dosage of 900 g/t,CaO dosage of 1100 g/t,TD-2 dosage in roughing of 500 g/t and cleaning of 200 g/t and the total iron grade of the reverse flotation concentrate was increased by 37.03%to 66.45%.The recovery rate of total iron was 39.29%,and the content of main impurity SiO_(2)was reduced from 42.56%to 2.35%.The ideal effect of iron recovery was realized.