Magnetic-gravity-magnetic combined separation process for treating lean magnetite

Abstract

The invention relates to a magnetic-gravity-magnetic combined separation process for treating lean magnetite. The process comprises the following step of feeding the magnetite with a grade of 24%-30% to be sequentially subjected to first-section closed circuit grinding and first-section weak magnetic separation to obtain first-section weak magnetic separation concentrate; and the process is characterized in that the first-section weak magnetic separation concentrate is sequentially subjected to subsequent gravity and weak magnetic separation combined operation, secondary grinding grading operation and third-section weak magnetic separation operation to obtain final concentrate and final tailings; the gravity and weak magnetic separation combined operation is performed through a spiral chute, a fine screen and a two-section weak magnetic separation machine, wherein a gravity separation process performed through the spiral chute is a gravity separation process of once coarse separation, once fine separation and once sweeping, the two-section weak magnetic separation machine is used for treating sweeping snail tailings, the fine screen is used for treating fine snail concentrate, and gravity separation concentrate is obtained; and secondary grinding grading operation and three-section weak magnetic separation operation are performed on the ores during the gravity and weak magnetic separation combined operation to obtain weak magnetic separation concentrate. The process has the advantages that the process is simplified, coarse grains are fined, over-grinding is reduced, energy is conserved, consumption is reduced and capability of a ball mill is released.

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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