Iron-separating and sulfur-removing enrichment method of high-sulfur hematite

Abstract

The invention relates to an iron-separating and sulfur-removing enrichment method of high-sulfur hematite, and belongs to the technical field of mineral processing. The enrichment method comprises thefollowing steps of crushing, screening, grinding and grading high-sulfur hematite raw ore or high-sulfur hematite coarse concentrate till the high-sulfur hematite raw ore or the high-sulfur hematitecoarse concentrate with the size of minus 0.074 mm occupies 75-85% of the total, to obtain fine-grain hematite or fine-grain hematite coarse concentrate II, and carrying out pulsation high-gradient magnetic separation rough separation on the fine-grain hematite to obtain hematite coarse concentrate I and pulsation magnetic separation tailings; carry out centrifugal high-gradient magnetic separation on the hematite coarse concentrate I and/or the fine-grain hematite coarse concentrate II to obtain centrifugal high-gradient magnetic separation concentrate and centrifugal magnetic separation tailings; and according to the actual situation, carrying out shaking table re-separation, flotation and fine separation or not finely separating on the centrifugal high-gradient magnetic separation concentrate to obtain hematite concentrate. According to "the pulsation high-gradient rough separation-the centrifugal high-gradient magnetic separation-flotation or shaking table re-separation and fine separation" process provided by the enrichment method applying to the high-sulfur hematite, compared with a traditional process, the sulfur removal is more thorough, the magnetic pyrite which is difficult to remove through a traditional method can be removed, and more excellent separating and grading indexes can be obtained.

Description

technical field [0001] The invention relates to a method for iron selection, sulfur removal and enrichment of high-sulfur hematite, which belongs to the technical field of mineral processing. Background technique [0002] my country is rich in hematite resources, but the iron grade is generally low and the harmful element sulfur exceeds the standard. However, ironmaking raw materials generally require iron grades greater than 50% and sulfur content less than 1% or even lower. Therefore, most hematite resources in my country must be further enriched and desulfurized before they can be used. The iron and sulfur removal process of traditional hematite is generally: pulsating high-gradient magnetic separation, roughing, tailings-gravity separation or flotation and concentration. However, the sulfur content is high, especially when part of the sulfur exists in the form of pyrrhotite, it is difficult to reduce the sulfur content to the qualified standard by traditional techniques...

AI Technical Summary

Problems solved by technology

But the sulfur content is high, especially when part of the sulfur exists in the form of pyrrhotite, it is difficult to reduce the sulfur content to the qualified standard by traditional technology

If the pulsating high-gradient roughing-gravity separation process is used for sulfur removal, a complicated and lengthy heavy-separation and separation process is required to make the sulfur content reach the standard, which will greatly increase the cost and reduce the iron recovery rate; if the pulsating high-gradient roughing- Flotation process, because pyrrhotite is partially magnetic and has poor floatability, it is difficult to reduce the sulfur content to the acceptable standard in this process

[0003] At present, there is still a lack of a low-cost and effective treatment of pyrrhotite-containing high-sulfur hematite enrichment method for iron removal and sulfur enrichment

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