关键词: 尾矿再选, 磁选, 反浮选

Abstract: 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.

Key words: Flotation tailings, Magnetic separation, Reverse flotation