Beneficiation technology of surface hematite and magnetite mixture with high slime viscosity

Abstract

The invention relates to a beneficiation technology of a surface hematite and magnetite mixture with the high slime viscosity. The technology is characterized in that the processed ore is the hematiteand magnetite mixture with the iron grade being 41.8% and the slime content being 30%; and the technology comprises three crushing processes including coarse crushing operation, intermediate crushingoperation and fine crushing operation and further comprises a beneficiation process composed of one-stage ball milling-swirler closed circuit ore grinding operation-primary magnetic separation operation, primary gravity concentrating operation, primary coarse and fine grading swirler operation, two-stage ball milling-swirler closed circuit ore grinding operation, secondary coarse and fine gradingswirler operation, secondary gravity concentrating operation, secondary magnetic separation operation and reverse flotation operation. The beneficiation technology has the advantages that the blockage problem in crushing operation is effectively solved, concentrate can be classified into iron concentrate I with the grade being 62% and iron concentrate II with the grade being 60%, the iron concentrate I is higher in price and capable of being used as pellet feed, the iron concentrate II is relatively low in price and capable of being used as sintering materials, and the market adaptability ofthe iron concentrate is expanded.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a process for beneficiating high-mud viscous surface red and magnetic mixed iron ore. Background technique [0002] At present, in many open-pit iron mines, due to the difference in the degree of oxidation of minerals exposed to oxygen, the surface ores are generally dominated by hematite and false hematite, and contain some magnetite and iron-bearing clay. According to the hydration degree and crystal structure of oxide ore, oxide ore can be divided into hematite, limonite and goethite. Due to long-term oxidation, erosion, hydration and weathering of surface ore, surface ore generally presents the characteristics of severe mudification, high slime content and sticky ore. At present, gyratory crushers and jaw crushers are mostly used for primary crushing in iron mines. The ore outlet of this type of primary crushing equipment is easily blocked by high-silt, high-w...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is a high mud sticky surface red and magnetic mixed iron ore beneficiation process that can effectively solve the clogging problem of the crushing operation and can improve the grade and recovery rate of the iron ore concentrate in the sorting operation

Images