Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology

A technology of iron ore tailings and magnetization roasting, which is applied in the field of metallurgy, can solve problems such as low utilization rate, environmental pollution, resource waste, etc., and achieve the effect of improving resource utilization rate, reducing environmental pollution, and reducing grinding processes

Active Publication Date: 2013-12-25
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

Since the founding of the People's Republic of China, the rapid development of the metallurgical industry and the immature beneficiation technology have led to a large amount of mining of such refractory ores but a low utilization rate, resulting in a large amount of tailings, which not only leads to waste of resources, but also has a huge impact on the environment.
[0003] For the above-mentioned refractory iron ore tailings, it is difficult to achieve good beneficiation effect by adopting conventional beneficiation methods, such as gravity separation, magnetic separation, flotation or combined process, for example, gravity separation cannot effectively deal with fine-grained powdery low high-grade iron ore; magnetic separation cannot effectively separate hematite, limonite and iron-containing silicates; flotation cannot effectively process low-grade iron ore with complex gangue components and similar physical and chemical properties to hematite and limonite
[0004] For the above-mentioned refractory iron ore tailings, magnetization roasting reduction technology is the best sorting m

Method used

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  • Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology

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Experimental program
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Effect test

Embodiment 1

[0029] Raw materials Refractory iron ore tailings TFe grade 20.63%, SiO 2 The content is 40.35%. The iron minerals mainly exist in the form of specularite, hematite, siderite and limonite. The particle size: -200 mesh and the content is 68.3%.

[0030] The following process steps are adopted for processing:

[0031] Step 1: using a strong magnetic separator with a field strength of 0.6T to carry out magnetic separation and enrichment of iron ore tailings, the yield is 57.4%, and the enriched tailings with a TFe grade of 31.3% can be obtained;

[0032] Step 2: Mix the enriched tailings obtained in Step 1 with coal powder and clay evenly in a ratio of 100:0.5:2, dry and moisten, and then pelletize with a disc pelletizer, wherein the particle size of coal powder is:- The content of 200 mesh is 83%; the particle size of the pellets is controlled at 8-12mm, the drop strength of the pellets is ≥5 times / 0.5m, and the compressive strength is ≥10 N / ball;

[0033] Step 3: Use a grate ...

Embodiment 2

[0040] Raw materials Refractory iron ore tailings TFe grade 25.71%, SiO 2 The content is 38.26%. The iron minerals mainly exist in the form of hematite, siderite and limonite. The particle size: -200 mesh content is 30.6%.

[0041] The following process steps are adopted for processing:

[0042] Step 1: The particle size of the tailings is: -200 mesh content 30.6%, which is relatively coarse. In order to improve the effect of strong magnetic enrichment and meet the requirements of pelletizing particle size, the ore is firstly ground, and the -200 mesh content is 65% after grinding. Then use a strong magnetic separator with a field strength of 0.9T to carry out magnetic separation and enrichment of the iron ore tailings, with a yield of 62.4%, and the enriched tailings with a TFe grade of 34.6% can be obtained;

[0043] Step 2: Mix the enriched tailings obtained in Step 1 with coal powder and bentonite in a ratio of 100:1.2:3, dry and moisten the pellets with a disc pelletizer...

Embodiment 3

[0051] Raw materials Refractory iron ore tailings TFe grade 22.14%, SiO 2 The content is 39.53%. The iron minerals mainly exist in the form of specularite, hematite, siderite and limonite. The particle size: -200 mesh content is 30.6%.

[0052] The following process steps are adopted for processing:

[0053] Step 1: The particle size of the tailings is: -200 mesh content 45.3%, which is relatively coarse. In order to improve the effect of strong magnetic enrichment and meet the requirements of pelletizing particle size, the ore is firstly ground, and the -200 mesh content is 62% after grinding. Then use a strong magnetic separator with a field strength of 1.2T to carry out magnetic separation and enrichment of the iron ore tailings, with a yield of 59.2%, and the enriched tailings with a TFe grade of 32.1% can be obtained;

[0054] Step 2: Mix the enriched tailings obtained in Step 1 with coal powder and resin evenly in a ratio of 100:2:1, dry and moisten and grind, and then us...

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Abstract

The invention provides a difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology. The technology mainly comprises the following technological steps: 1, carrying out magnetic separation enrichment of iron ore tailing by a strongly-magnetic magnet separator having a field intensity of 0.6-1.2T; 2, uniformly mixing an obtained enriched tailing with coal dust and a binder according to a ratio of 100:0.5-2:1-3, drying, carrying out damp milling treatment, and pelletizing; 3, drying pellets obtained in step 2; 4, carrying out the magnetic roasting of dried pellets by adopting a rotary kiln; 5, cooling the magnetically-roasted pellets in a water quenching mode; 6, milling the cooled pellets; and 7, carrying out magnetic separation of ground ore powder to obtain iron ore concentrate. The technology allows the iron ore concentrate having a TF2 grade of about 56% can be obtained, increases the metal recovery rate to above 75% from original 65-70%, improves the resource utilization rate and reduces the environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a magnetization roasting treatment process of a refractory iron ore tailings pelletizing rotary kiln. Background technique [0002] my country's iron ore resources are rich in lean ore and less in rich ore. Lean ore accounts for about 94.6% of the total reserves, and most of them have the characteristics of low grade of raw ore, complex mineral composition, and fine particle size. Since the founding of the People's Republic of China, the rapid development of the metallurgical industry and the immature beneficiation technology have led to a large amount of mining of such refractory ores but low utilization rates, resulting in a large amount of tailings, which not only leads to waste of resources, but also has a huge impact on the environment. [0003] For the above-mentioned refractory iron ore tailings, it is difficult to achieve good beneficiation effect by adopting conventiona...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/02B03C1/015
Inventor 王明华展仁礼张科谷怀雨郭亿李慧春陈永祺马胜军姜华权芳民
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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