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A mineral processing method for obtaining high-purity iron concentrate from iron ore

A beneficiation method and iron ore technology are applied in the field of beneficiation of high-purity iron ore concentrates, which can solve the problems of effective separation, high operation cost and high equipment investment, and achieve the effects of improving iron recovery rate, low cost and simple process.

Active Publication Date: 2021-02-19
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Method ① is a traditional iron ore beneficiation method, with simple process structure and easy operation and management, but has disadvantages such as high equipment investment, high operating cost, and difficulty in dehydration and filtration of concentrate; method ② After the second stage of grinding, strong magnetic separation can Part of the concentrated ore was obtained, which reduced the amount of ore entering the flotation process. However, the investment in the strong magnetic separation equipment was large, and the hematite or specularite minerals that had been dissociated from the monomer could not be effectively separated under the rough grinding condition, resulting in the first The grade of strong magnetic tailings in the first stage is high, the amount of ore entering the mill in the second stage is large, and the iron minerals are over-grinded.

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  • A mineral processing method for obtaining high-purity iron concentrate from iron ore
  • A mineral processing method for obtaining high-purity iron concentrate from iron ore
  • A mineral processing method for obtaining high-purity iron concentrate from iron ore

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Embodiment 1

[0041] my country imports iron ore with a TFe grade of 53-54% from a mine in Australia, with a magnetic iron content of 1.6%. The iron minerals in the ore are mainly magnetite, hematite, specularite and false hematite, and occasionally a small amount of brown Iron ore; the gangue minerals are mainly quartz, followed by chlorite, sericite, muscovite and calcite, and other trace minerals include zircon, apatite, and sphene. Hematite or specularite is widely distributed, euhedral, semi-euhedral plate flake or granular, a few are needle-shaped, the crystal size varies greatly, the coarse one can reach more than 0.6mm, the finer one is less than 0.05mm, generally 0.1 ~0.4mm. Generally speaking, hematite and specularite in the ore are mainly produced in the form of dissemination, and the particle size is relatively coarse. Therefore, some high-grade iron concentrates are recovered in advance by coarse-grained grades.

[0042] Concrete beneficiation method for obtaining high-purity i...

Embodiment 2

[0050] The ore grade of TFe in a mine in Anhui is 33%, the magnetic iron content is 8.7%, and the composition minerals are relatively simple. The iron minerals are mainly magnetite and specularite, and a small amount of semi-pseudo-hematite, pseudo-hematite and limonite Metal sulfide ore is pyrite, occasionally chalcopyrite is scattered; gangue minerals are mainly quartz, followed by biotite, muscovite, actinolite, tremolite, serpentine and chlorite, others Trace minerals are zircon, apatite and sphene. Magnetite is one of the most important iron minerals in ore. Euhedral and semi-euhedral equiaxed granular, some are irregular, and the crystal grain size is only about 0.03mm, generally 0.1-0.4mm. According to the intergrowth relationship with other minerals, the output forms of magnetite in the ore can be roughly divided into two types: one is sparsely disseminated in the gangue, and rarely forms a large aggregate; the other is along the hematite Or specularite edge and inte...

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Abstract

The invention discloses a beneficiation method for obtaining high-purity iron ore concentrate from an iron ore. The method comprises the steps of: performing ore grinding of an iron ore with a TFe grade with 30-60%; performing strong magnetic sorting or reselection for the iron ore after ore grinding, and sorting the iron ore concentrate and the tailing with a TFe grade larger than 65%; performingmagnetic separation of the sorted tailing by adopting a vertical ring pulsation strong magnetic machine or a flat ring strong magnetic machine, and selecting the iron ore concentrate with the TFe grade with 50-55%; performing ore grinding again and grading for the iron ore concentrate with the TFe grade with 50-55%; and performing combination of one or more than one in an external magnetic type strong magnetic separator, the vertical ring pulsating strong magnetic separator and the horizontal ring strong magnetic separator for magnetic separation to obtain an iron ore concentrate with the TFegrade larger than 58%. The beneficiation method introduces the external magnetic type strong magnetic separator to obtain high-grade iron ore concentrate in a rough ore grinding condition to providea foundation for the follow-up low-grade strong magnetic concentrate not to enter flotation operation, and therefore, the beneficiation method is simple in process, low in cost and environment-friendly.

Description

technical field [0001] The invention belongs to the field of mineral processing, in particular to a mineral processing method for separating high-purity iron concentrate from hematite or specularite hematite and other minerals. Background technique [0002] my country's iron and steel industry has developed rapidly in the past ten years, so the demand for iron ore resources is increasing. my country's proven reserves of iron ore resources are 60.7 billion tons, and the estimated unidentified resources are more than 100 billion tons. Moreover, there are few rich iron ores and many lean ores. 97% of the iron ore is low-grade iron ore with less than 30%. [0003] In my country, the grade of quartz-type hematite or specularite is 30-40%, mainly Anshan-type hematite and specularite in Huoqiu area of ​​Anhui. Abroad, Australia has a large amount of hematite with TFe grade of 40-57%. . At present, the beneficiation methods of hematite or specularite at home and abroad mainly inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/02B03B7/00B03B9/00
CPCB03B7/00B03B9/00B03C1/02
Inventor 曾尚林刘苗华
Owner CHANGSHA RES INST OF MINING & METALLURGY