Technique for processing mixed type iron ore

Abstract

The invention discloses a process for treating mixed-type iron ore. The process comprises the following steps: raw ore is crushed and then subjected to primary grinding and primary grading which form closed circuit grinding; after primary overflow is subjected to crudeness/fineness grading and coarse grains are sorted through a gravity separation device, spiral chute concentrate is fed into a fine screen with large mesh size, and undersize products are coarse-grain concentrate; after gravity separation tailings are subjected to tailings discarding through intermediate-magnetism sweeping, intermediate-magnetism sweeping concentrate, gravity separation middlings and oversize products are merged into coarse-grain middlings; the middlings are fed into an open-circuit grinding system consisting of secondary grading and secondary grinding and reground, and then return to crudeness/fineness grading; fine grains after crudeness/fineness grading are sorted through a magnetic separation device; magnetic separation concentrate is fed into the fine screen with small mesh size, and the undersize products are fine-grain concentrate, while the oversize products are fine-grain middlings which are directly fed into two-stage grinding so as to be reground; fine-grain concentrate and the coarse-grain concentrate are merged into final concentrate; and intermediate-magnetism sweeping tailings and the magnetic separation tailings are merged into final tailings. The process has the advantages of good flow stability, easy operation and capability of effectively recovering the mixed-type ore and fully utilizing mixed-type ore resources.

Description

technical field [0001] The invention relates to a beneficiation process, in particular to a beneficiation process for processing mixed iron ore containing magnetite and hematite. Background technique [0002] At present, ferrous metal beneficiation generally adopts the process of "stage grinding, coarse and fine separation, gravity-magnetic-anion reverse flotation" and "stage grinding, magnetic separation-fine sieve regrinding". The ore properties of the poor hematite ore in Anshan area and the poor magnetite ore in Anshan area have achieved better economic indicators and greater economic benefits, reaching the world's leading level. However, with the increase of mining depth and the expansion of production capacity, the original ore mainly composed of single magnetite and single hematite gradually decreased, while the mixed ore gradually increased. [0003] Some mixed ores contain more magnetite. After mining, a single magnetic separation process is used for separation, an...

AI Technical Summary

Problems solved by technology

[0006] Because the present invention adopts stage grinding, coarse and fine separation, gravity-magnetic combined process, it is suitable for the properties of mixed ore, overcomes single magnetic separation process that cannot effectively recover hematite and flotation operation agent system is complicated, and is easily affected by other Insufficient mineral interference, good process stability and easy operation can realize effective recovery of mixed ore and make full use of mixed ore resources

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