Mineral separation method for pre-extraction of concentrates from roasted iron ore

A beneficiation method and iron ore technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of over-grinding, low recovery rate of beneficiation metal, low grade of iron concentrate, etc. The effect of reducing the amount of secondary grinding and improving the metal recovery rate

Active Publication Date: 2015-07-22
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide a roasted iron ore beneficiation method for pre-extracting concentrate, so as to solve the problem of adopting conventional stage grinding and stage separation for magnetized roasted iron ore with

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  • Mineral separation method for pre-extraction of concentrates from roasted iron ore

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] like figure 1 A roasted iron ore beneficiation method for pre-extracting concentrate is shown. This method uses roasted ore with embedded particle size range of 15-120 μm and refractory low-grade iron ore after magnetization and roasting with uneven particle size distribution as raw material. Include the following steps:

[0028] (1) One-time grinding of roasted ore, the roasted ore is added to the ball mill for one-time grinding, and the material after the first grinding is passed through a cyclone classifier for particle size classification, and the collected particle size is -160 mesh. The mass percentage accounts for 50~ 60% fine-grained materials, and the remaining coarse-grained materials are returned to the ball mill for grinding;

[0029] (2) For the magnetic separation of primary grinding materials, the fine-grained materials collected in st...

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Abstract

The invention relates to the technical field of metallurgy and mineral engineering and discloses a mineral separation method for pre-extraction of concentrates from roasted iron ore. According to the method, roasted ore which is uniform in size distribution and formed after magnetizing roasting of refractory low-grade iron ore with the insetting grain size of 15-120 mu m is taken as a raw material; the method comprises process steps of primary ore grinding of the roasted ore, magnetic separation of primary ore ground materials, primary ore concentrate pre-extraction of rough concentrate with a large grain size, three stages of magnetic separation of materials with fine grain sizes, secondary ore concentrate pre-extraction of rough ore concentrate with medium grain sizes and the like. The method of fractionated ore grinding and fractionated magnetic separation is adopted due to the fact that different insetting grain sizes of the roasted ore correspond to different ore grinding sizes; iron ore concentrate is extracted in a fractionated manner according to difference of grain sizes, the over-grinding phenomenon of coarse-grain iron ore is effectively prevented, the separation efficiency and the metal recovery efficiency are improved, the over-grinding phenomenon of the iron ore with larger grain sizes in the roasted ore is effectively prevented, the production cost is reduced, and the ore separation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy and mineral engineering. Specifically, the roasted ore controls different grinding finenesses during the graded grinding process, and adopts graded extraction of iron concentrates according to different grain sizes, which can effectively prevent coarse-grained iron ore Over-grinding phenomenon, a roasted iron ore beneficiation method for pre-extracting concentrate to improve beneficiation efficiency and metal recovery rate. Background technique [0002] The grade of iron ore in my country is low, and lean ore reserves account for more than 80% of the total. Most of the embedded grains are fine and complex, and they belong to "poor, fine, and miscellaneous" refractory iron ores. Due to the limitations of current beneficiation technology, a large amount of refractory low-grade iron ore has not been effectively utilized. [0003] In the beneficiation process of refractory low-grade iron ore, gene...

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Application Information

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IPC IPC(8): B03C1/30
Inventor 王明华展仁礼刘千帆权芳民王欣张科郭忆付涛
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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