关键词: 钒钛磁铁矿, 工艺矿物学, 预选, 预富集, 弱磁选, 类质同象, 回收率

Abstract: A detailed study on process mineralogy of weathering crust-type vanadium-titanium magnetite in western Liaoning Province was carried out in view of the difficulty in recycling it’s useful minerals. The metal minerals in the ore are mainly magnetite， titanomagnetite， vanadium magnetite， and ilmenite. Non-metallic minerals mainly include feldspar， amphibole and quartz. Among them， titanium and vanadium mainly occur in the form of isomorphism in magnetite， and the distribution relationship of magnetite， ilmenite and gangue minerals is complex， which is difficult to be liberated. The comparative experiments of preconcentration processes were carried out by direct grinding - low intensity magnetic separation preconcentration， coarse particles dry pre-discarding-grinding-low intensity magnetic separation preconcentration， and coarse particles wet pre-discarding-grinding-low intensity magnetic separation preconcentration. The results show that wet pre- discarding-grinding-low intensity magnetic separation is superior to the other two processes in terms of power consumption and recovery index. Under the condition of grinding fineness of -0.074 mm is 70%， the preconcentrated concentrate with V₂O₅ content of 1.561%， recovery of 60.96%， TFe grade of 40.43% and recovery of 24.83% was obtained， which can meet the requirements of subsequent direct acid leaching and vanadium extraction. The analysis of the concentrate and tailings obtained by the wet pre-discarding- grinding-low intensity magnetic separation process shows that vanadium and titanium replace the iron in the magnetite in the same way as the crystal， so that the preconcentrated concentrate iron grade is low， and the magnetite， titanomagnetite and gangue mineral in the preconcentrated concentrate are complicated and inseparable， and cannot be dissociated by mechanical grinding. Therefore， even if the grinding fineness continues to increase， the total iron grade in the pre-enriched concentrate can only be maintained at about 40% and cannot be continuously improved.

Key words: Vanadium titanium magnetite, Process mineralogy, Preseparation, Preconcentration, Low intensity magnetic separation, Isomorphism, Recovery rate