鲁南矿业浮选尾矿再选工艺研究

鲁南矿业有限公司铁矿石系鞍山式贫磁铁矿，现场生产反浮选尾矿品位达27%，以磁铁矿形式存在的铁占76.54%，存在回收的可能性。采用磁选-反浮选工艺对现场浮选尾矿进行再选试验，结果表明：在再磨细度为-0.043 mm占90%、磁场强度为110 kA/m时，可以得到铁品位为44.36%的磁选精矿，将其作为反浮选的给矿，在浮选温度为35℃，粗选NaOH用量为800 g/t、淀粉为700 g/t、CaO为300 g/t、MD-27为300 g/t、矿浆浓度为40%时，经1粗1精2扫闭路反浮选，得到的精矿铁品位为62.39%、回收率为49.36%，满足了公司对铁精矿品质的要求，可以作为现场流程改造的依据。

Reconcentration Experiments on Flotation Tailings of Lunan Mining

Iron ore in Lunan Ming Co.，Ltd.belongs to Anshan type lean magnetite.Iron grade of on-site reverse flotation tailings is 27%，76.54% of which exists in form of magnetite，and can be recycled.Magnetic separation and reverse flotation technology for reconcentrationt of flotation tailings was conducted.The results indicated that at the regrinding fineness of 90% passing 0.043mm and magnetic field intensity is 110 kA/m，magnetic concentrate with iron grade of 44.36% is obtained and be treated as flotation feedings.Iron concentrate with iron grade of 62.39% and recovery of 49.36% was received at reverse rough flotation temperature of 35 ℃，NaOH dosage of 800 g/t，starch of 700 g/t，CaO of 300 g/t，MD-27 of 300 g/t，pulp density of 40%，through one roughing-one cleaning-two scavenging closed cirouit reverse flotation process.The experiment results can meet the requirements of iron concentrate，and provide technique basis for transformation of dressing plant.