Coarse grain pre-selection and magnetic-floating separation process for mixed ores with embedded micro-fine particles

Abstract

The invention relates to a coarse grain pre-selection and magnetic-floating separation process for mixed ores with embedded micro-fine particles. The coarse grain pre-selection and magnetic-floating separation process is characterized in that a 'half-self-grinding, wet-type pre-selection, continuous ore grinding, weak magnetic-strong magnetic fine screening and re-grinding and strong magnetic reverse flotation' operating system is adopted to sort the mixed ores with embedded micro-fine particles, and iron ore concentrates with grade of 65%-65.5% and yield of 35%-40% are obtained. The coarse grain pre-selection and magnetic-floating separation process has the advantages that 15%-20% large-particle qualified tailings are obtained from the ores through the wet-type pre-selection, the magnetic ores with yield of 15%-20% and grade of higher than 65% can be separated in advance through magnetic-floating separation, the ore feeding amount of separation operation is reduced, the number of flotation machines is decreased, agent using amount is decreased, and ore separation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to coarse-grain pre-selection and magnetic-flotation separation process of fine-grain embedded mixed ore. Background technique [0002] In recent years, the domestic separation of lean iron ore has successfully adopted "continuous grinding, weak magnetic-strong magnetic-negative reverse flotation", "stage grinding, weak magnetic-strong magnetic-anion reverse flotation", "stage Grinding, coarse and fine classification, medium ore regrinding, heavy-magnetic-reverse flotation", "continuous grinding, coarse and fine classification, medium ore regrinding, heavy-magnetic-reverse flotation", "three-stage grinding, stage weak The magnetic-intensity magnetic-reverse flotation process has been promoted and applied in Anshan Iron and Steel Co., Ltd. and other domestic processing plants. [0003] These processes adopt three-stage crushing and screening of the raw ore, and the -1...

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Problems solved by technology

[0007] In this process, the particle size of a mixed magnetic concentrate after regrinding reaches 85% to 90% of -325 mesh. A certain amount of magnetic ore in the product of this grinding particle size has been fully dissociated from the monomer, and the qualified grade magnetic ore can be obtained through magnetic separation. Concentrate, but the magnetite contained in the ore in the process has reached the monomer dissociation into the reverse flotation operation, which makes the consumption of chemicals in the flotation operation large, which increases the processing capacity of the flotation operation, and also Increased the dosage of flotation agents and beneficiation costs, resulting in some insufficiently mineralized fine-grained magnetic ore entering the tailings of flotation operations, resulting in high tailings grades and large metal loss.

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