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Benefication of magnetite-haematite acid mixed mine

A technology for hematite and mixed ore, applied in chemical instruments and methods, magnetic separation, wet separation, etc., can solve problems such as equipment environmental pollution, gangue recovery, waste of iron resources, etc., to improve economic benefits and rational use The effect of high resource and concentrate grade

Inactive Publication Date: 2006-05-31
KUNMING IRON & STEEL GRP CO LTD +1
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AI Technical Summary

Problems solved by technology

Because the hematite in this ore is crystal-linked with magnetite, the particle size is relatively fine, 0.05mm accounts for more than 60%, and -0.02mm accounts for 33.4%, and some fine grains are also disseminated in the In the gangue, that is, the combination with the gangue is relatively tight. After the ore grinding, the poor contiguous body of this part of the particles will bring more gangue into the concentrate under the action of a strong magnetic field, which not only affects the grade of the concentrate, but also Because some fine-grained iron ore enters the tailings along with the gangue, precious iron resources will be wasted, thus affecting the recovery rate of iron ore
Therefore, magnetic separation cannot be used alone for sorting
If reverse flotation is used to recover hematite, only silicon and silicate can be removed, but gangues such as feldspar and mica cannot be removed, which still affects the concentrate grade and recovery rate
If positive flotation is used, because the minerals are closely combined with the gangue, it is easy to make the gangue be recovered with the iron ore, which not only affects the concentrate grade and recovery rate, but also uses strong acid for flotation, which will cause serious damage to equipment and the environment. A series of problems such as pollution and high cost of pharmaceutical use
Therefore, it is not possible to use only flotation for sorting

Method used

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  • Benefication of magnetite-haematite acid mixed mine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Selected ore chemical composition: SiO 2 18.32%, TFe 50.63%, S 0.013%, P 0.061%, K 2 O 0.082%, Na 2 O 1.095%.

[0018] A. Grind the raw ore with water so that the grinding fineness reaches -200 mesh, accounting for 50%, control the pulp concentration to 50%, carry out a section of strong magnetic separation under the condition of a magnetic field strength of 6000 austeres, discard the tailings, and obtain a grade of 30 % coarse concentrate;

[0019] B. Continue to grind the above-mentioned coarse concentrate so that the fineness reaches -200 mesh, accounting for 70%, control the pulp concentration to 30%, and carry out the second-stage strong magnetic separation under the condition of a magnetic field strength of 5000 austeres, and the selected grade reaches 40 % concentrate pulp;

[0020] C. Flow the above-mentioned concentrated ore slurry into the mud separator 1 by gravity, concentrate and keep the overflow of the mud separator as clear water, and keep the conce...

Embodiment 2

[0026] A. Grind the raw ore with water to make the grinding fineness reach -200 mesh, accounting for 60%, control the pulp concentration to 80%, carry out a stage of strong magnetic separation under the condition of a magnetic field strength of 8000 austeres, discard the tailings, and obtain a grade of 47 % coarse concentrate;

[0027] B. Continue to grind the above-mentioned coarse concentrate so that its fineness reaches -200 mesh, accounting for 85%, control the pulp concentration to 40%, and carry out two-stage strong magnetic separation under the condition of a magnetic field strength of 6000 austeres, and the selected grade reaches 47 % concentrate pulp;

[0028] C. Flow the above-mentioned concentrated ore slurry into the mud separator 1 by gravity, concentrate and keep the overflow of the mud separator as clear water, and keep the concentration of the bottom flow pulp at 30%;

[0029] D. Send the above-mentioned ore slurry to the distribution box 5 of the spiral chute...

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Abstract

A magnetic separation method for preparing the ore concentrate from the acidic mixture of magnetite and hematitie includes such steps as strong magnetic separating twice, separating by spiral chute for the separated concentrate, and separating by sorting table for the intermediate ore and tailings. Its advantages are high quality of ore concentrate and high recovery rate.

Description

technical field [0001] The invention relates to a beneficiation method, in particular to a beneficiation method of refractory maghemite minerals. Background technique [0002] Among the existing beneficiation methods, the three most widely used methods are magnetic separation, gravity separation and flotation. With the continuous scarcity of resources, there are more and more fine-grained, low-grade, complex and difficult-to-separate gangue belt iron ores. Simply using the existing magnetic separation, gravity separation or flotation can no longer be effectively separated and recycled. iron ore, which is extremely unfavorable to the full utilization of limited resources. Especially for the Dahongshan Iron Mine in Yuxi, Yunnan Province, the ore is dominated by magnetite with a content of 60%, followed by hematite with a content of 40%. The gangue in it is mainly quartz, which belongs to Magnetite-hematite acid mixed ore. Because the hematite in this ore is crystal-linked w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03C1/30
Inventor 李平沈立义梁文波郑旭
Owner KUNMING IRON & STEEL GRP CO LTD
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