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Beneficiation process of maghemite

An iron ore and process technology, which is applied in the field of hemagnetism mixed iron ore beneficiation process of high-grade iron ore concentrate, can solve the problems of difficulty in sales and difficulty in finding a market for concentrates, achieve a good separation effect and save equipment investment. and energy consumption, the effect of ensuring quality

Inactive Publication Date: 2018-09-28
中冶北方(大连)工程技术有限公司
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Problems solved by technology

[0003] Low-quality concentrates are hard to find in the market and often hard to sell even at low prices

Method used

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  • Beneficiation process of maghemite

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with drawings and embodiments.

[0023] Such as figure 1 Shown: a kind of hematite mixed iron ore beneficiation process of the present invention, comprises that the iron grade is 42%, and the hematite mixed iron ore that iron-containing clay content is 30% in raw ore is fed into three section-closed-circuit crushing process, obtains particle size It is a crushed product of 12-0mm, which is characterized in that the processing of the crushed product adopts pre-grading + closed-circuit grinding process, magnetic separation process and gravity separation process. The specific steps are as follows:

[0024] 1) Pre-grading + closed-circuit grinding process

[0025] Feed the crushed product with a particle size of 12-0mm into the wet single-layer vibrating screen to obtain the on-screen product and the under-screen product, and the +1mm on-screen product with a yield of 70% is fed into the first stage of cl...

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Abstract

The invention relates to a beneficiation process of maghemite. Raw ores are the maghemite. The iron grade is 41%-43%. The content of ferruginous clay is over 30%. The beneficiation process of the maghemite is characterized in that crushed products with the grain size being 12-0 mm are processed according to the following technological flow comprising that (1) pre-grading and closed-loop ore grinding are conducted during ore grinding, (2) weak intensity magnetic separation-medium intensity magnetic separation-high intensity magnetic separation-elutriation magnetic separation are conducted during magnetic separation, and (3) spiral chute roughing separation, concentration and scavenging are conducted during gravity separation; and the comprehensive concentrates composed of magnetic separation concentrates and gravity separation concentrates are obtained, wherein the grade of the comprehensive concentrates is 62% or over, and the recovery rate is 62.00-63.00%. The beneficiation process ofthe maghemite has the advantages that the crushed products are graded in advance, only one-stage closed loop ore grinding is adopted, and therefore investment and energy consumption are reduced; (2)magnetic separation concentrates are directly obtained from the products of the one-stage ore grinding through an elutriation magnetic separator; and (3) tailing discarding is conducted on coarse andfine classification overflow of cyclone to remove the ferruginous clay before gravity separation, so that the influence of the ferruginous clay on the quality of the gravity separation concentrates islowered.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a hematite mixed iron ore beneficiation process capable of producing high-grade iron concentrate with a product grade of more than 62%. Background technique [0002] In open-pit iron mines, especially the ore bodies located close to the surface and transitioning to the deep underground, due to the different degrees of oxidation and hydration, the useful minerals contained in this part of the ore body are very complex, mainly including hematite, false Hematite, limonite, goethite and magnetite. Limonite and goethite, which are often hydrated in this kind of ore, have a large content. Since the molecular structure of limonite and goethite contains crystal water, the theoretical iron grade of their pure minerals is not high; in addition, this Due to long-term weathering and erosion of ore-like ores, useful mineral particles often contain a large amount of...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B5/62B03C1/30B02C21/00
CPCB02C21/00B03B5/62B03B7/00B03C1/30
Inventor 杨海龙李国洲
Owner 中冶北方(大连)工程技术有限公司
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