Magnetic-gravity combined ore dressing technology for hematite

Abstract

The invention discloses a magnetic-gravity combined ore dressing technology for hematite, comprising the following steps of: carrying out dry magnetic separation and jigging gravity separation to obtain blast furnace lump ore, throwing the tailings of the lump ore, carrying out first-stage ore grinding, weak magnetic separation, strong magnetic separation and centrifugal gravity separation on middlings, and carrying out second-stage ore grinding, weak magnetic separation, strong magnetic separation and centrifugal gravity separation. According to the technology, part of qualified blast furnace lump ore (the iron grade is large than 54%) can be obtained in advance, the massive tailings (the iron grade is less than 12%) can be thrown out, the quantity of the ball-milled ore (the middlings) can be greatly reduced, and the grinding and separation energy consumption can be greatly reduced. The massive tailings which are thrown out can replace the macadam and the stone to be taken as the building material, so that the comprehensive utilization of the bulk quantity of the tailings resource can be realized, and the technology is prominent in emission reduction effect; and the whole ore dressing technology is the magnetic-gravity combined ore dressing technological process, so that the flotation reagents can not be consumed, the technology is very friendly to the work environment and the neighboring environment, the environment can be protected, the pollution of the beneficiation reagent to the environment caused by the flotation work can be avoided, and the technology is particularly suitable for the ore dressing of the medium and high-grade (the iron grade is more than or equal to 38%) hematite.

Description

technical field [0001] The invention relates to a beneficiation method of hematite ore, in particular to a combined beneficiation method of middle and high grade hematite ore, especially suitable for beneficiation of middle and high grade hematite ore (iron grade ≥ 38%). Background technique [0002] Hematite is an important iron ore resource in my country, with poor selectivity, mainly distributed in Liaoning, Hebei, Gansu, Anhui, Inner Mongolia, Henan, Hubei, Shanxi, Guizhou, Hainan and other places. In the early 1960s, roasting-magnetic separation and single flotation processes were mainly used to process hematite ore in China, and the production technical indicators were poor. In the 1980s and 1990s, stage grinding, gravity separation-magnetic separation-acid positive flotation and stage grinding, gravity separation-magnetic separation-anion reverse flotation were adopted successively. In recent years, two-stage continuous grinding, intermediate Ore regrinding, gravity ...

AI Technical Summary

Problems solved by technology

In the early 1960s, roasting-magnetic separation and single flotation processes were mainly used in China to process hematite ore, and the production technical indicators were poor.

The hematite ore pre-selection method introduced in the above literature can improve the grade of the pre-selection concentrate and throw out some tailings, but it cannot obtain high-grade hematite lump ore that can be directly put into the furnace

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