A magnetic-gravity-magnetic combined beneficiation process for processing lean magnetite

Abstract

The invention relates to a magnetic-gravity-magnetic combined mineral processing process for processing lean magnetite, comprising: feeding ore with a grade of 24% to 30% magnetite through a section of closed-circuit grinding and a section of magnetic field weakening to obtain a section of magnetic field weakening Concentrate, characterized in that, the first stage of weak magnetic concentrate is sequentially processed through subsequent gravity-magnetic sieve combination operations, secondary grinding and classification operations, and three-stage magnetic separation operations to obtain final concentrates and final tailings; The heavy-magnetic screen combination operation consists of a spiral chute, a fine screen and a second-stage magnetic weakening machine, wherein the gravity separation process composed of the spiral chute is a gravity-sweeping-sweeping gravity-separation process, and the second-stage magnetic weakening machine handles sweeping For the snail tailings, the fine sieve is used to process the snail concentrate to obtain the gravity-separated concentrate; the ore in the combined operation of the gravity-magnetic sieve undergoes secondary grinding and classification operations and three-stage magnetic separation operations to obtain the magnetic-separated concentrate. The advantages are: simplifying the process, getting fine grains from coarse grains, reducing over-grinding, saving energy and reducing consumption, and releasing the capacity of the ball mill.

Description

technical field [0001] The invention belongs to the technical field of mining engineering beneficiation, and in particular relates to a magnetic-gravity-magnetic combined beneficiation process for processing lean magnetite. Background technique [0002] At present, most domestic magnetite concentrators use stage grinding-stage sorting-single magnetic separation-fine sieve regrinding process when processing magnetite with uneven particle size. Although it is stage grinding-stage magnetic separation, for the first stage of magnetic separation operation, only one stage of magnetic separation tailings has achieved coarse-grained tailings, while for the first stage of magnetic separation of coarse-grained iron ore that has been dissociated from the concentrate However, the final coarse-grained ore concentrate product is obtained without the beneficiation operation to achieve the coarse-grained ore concentrate. Instead, regardless of whether the iron mineral monomers in the first-...

AI Technical Summary

Problems solved by technology

Therefore, there are the following problems in the treatment of magnetite with uneven particle size in this mineral processing process: 1) The iron minerals that have reached the monomer dissociation in the first-stage magnetic separation concentrate enter the second-stage grinding, which affects the second-stage grinding. The ore processing capacity increases the grinding cost; 2) The single dissociated iron ore is ground again to produce excessive crushing, which wastes energy unnecessarily and deteriorates the follow-up sorting index, resulting in increased metal loss and lower recovery rate. Problem; 3) In short, a large amount of iron ore that has been dissociated from the monomer is excessively ground, which eventually results in tedious and cumbersome process, low efficiency, large water consumption and high beneficiation cost

[0009] Based on the uneven particle size distribution of iron minerals in magnetite, the grinding and separation process of coarse and fine separation, coarse particles and final concentrate has not been reported yet.

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