High-yield two-product mixed maghemite beneficiation process

Abstract

The invention relates to a high-yield two-product mixed maghemite beneficiation process. The high-yield two-product mixed maghemite beneficiation process comprises three-section breakage including coarse breaking, medium breaking and fine breaking on mixed maghemite, and is characterized by further comprising the following steps: sieving operation, a one-section closed circuit grinding operation implemented by a one-section ball-milling-cyclone, primary beneficiation operation, coarse and fine classification operation, reselection operation, secondary magnetic separation operation and centrifuging operation; a primary magnetic separation operation sieve treats overflow products of one-section closed circuit grinding operation, sieving operation and undersizes, the coarse and fine classification operation treats bulk concentrate obtained by primary beneficiation, the reselection operation treats coarse grain products of the coarse and fine classification operation, the secondary beneficiation operation treats coarse particle products of the coarse and fine classification operation, and the centrifuging operation treats bulk concentrates of secondary weak magnetic separation. The high-yield two-product mixed maghemite beneficiation process has the advantages that iron ore concentrates I with grade being 62% for pelletizing raw materials and iron ore concentrates II with grade being 58% for sintered raw materials can be selected out.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a hematite mixed iron ore beneficiation process with high yield and two products. Background technique [0002] At present, many mines, especially surface mines and transitional mines, have complex ore types due to different degrees of oxidation and hydration, mainly including hematite, false hematite, limonite, goethite and some magnetite ; Due to the long-term weathering and erosion during the mineralization process, minerals often contain a large amount of iron-bearing clay. The iron-bearing clay with fine particles and low grade of this kind of ore is often mixed in the fine-grained concentrate during fine grinding, resulting in low-grade fine-grained concentrate and affecting the quality of fine-grained concentrate. In particular, limonite and goethite, which are often hydrated in this kind of ore, have a large content. Because the molecular structure of this...

AI Technical Summary

Problems solved by technology

However, if coarse-grained ore grinding is directly used in the beneficiation process, the recovery of total iron will be too low due to insufficient dissociation of minerals, and most recovery rates will not exceed 50%.

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