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Method using weak magnetic iron ore for producing fine iron powder and cement

An iron ore and weak magnetic technology, which is applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of unusable tailings, high moisture content of iron concentrate powder, and high grinding cost, so as to avoid dehydration and filtration Difficulty, high metal iron recovery rate, high concentrate grade effect

Inactive Publication Date: 2009-12-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For fine-grained oolitic hematite or other weakly magnetic iron minerals, the iron metal can be relatively effectively recycled by using the magnetization roasting-magnetic separation process, but the cost of the roasting process is high; the roasting material will continue Only by fine grinding can the minerals be fully dissociated, so that the iron minerals can be effectively recovered, resulting in high grinding costs; the fine abrasives are separated by wet separation, and the dehydration and filtration of the obtained iron fine powder is difficult, resulting in a high moisture content of the iron fine powder. And the sorted tailings cannot be used, causing disasters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A method for producing iron fine powder and cement with weakly magnetic iron ore. The weakly magnetic iron ore is typical Guizhou oolitic hematite, and its main chemical components are: TFe is 42.14wt%, FeO is 0.35wt%, P is 0.86wt%, SiO 2 22.21wt%, Al 2 o 3 10.22wt%, CaO 3.01wt%, MgO 0.13wt%, particle size 2-0mm.

[0013] The technical scheme adopted in this embodiment is: first fully mix 55-60wt% weakly magnetic iron ore, 19-25wt% coal powder, 10-13wt% limestone and 5-7wt% steel slag; The material is pressed into a φ20×30mm cylinder on a press for roasting, the roasting temperature is 1400-1450°C, the roasting time is 0.5-1.0h, sealed and cooled to room temperature; then the roasted material is broken and dry-ground to below 25 μm; Finally, the patented technology of "a micro powder dry magnetic separator" applied by the applicant on the same day is used for dry magnetic separation to obtain iron fine powder and cement clinker.

[0014] The particle size of coal po...

Embodiment 2

[0016] A method for producing iron fine powder and cement with weakly magnetic iron ore. The weakly magnetic iron ore is a typical oolitic high-phosphorus hematite in western Hubei, and its main chemical components are: TFe is 54.86wt%, FeO is 4.97wt%, P is 1.43wt%, SiO 2 10.37wt%, Al 2 o 3 1.14wt%, CaO 0.53wt%, MgO 0.87wt%, particle size 2-0mm.

[0017] The technical solution adopted in this embodiment is: first fully mix 60-65wt% of weak magnetic iron ore, 15-20wt% of coke powder and 15-20wt% of olivine; Press into a cylinder of φ20×30mm for roasting, the roasting temperature is 1250-1300°C, the roasting time is 1.0-1.5h, sealed and cooled to room temperature; then the roasted material is broken and dry-ground to below 25μm; finally, the applicant On the same day, the patented technology of "a micro-powder dry magnetic separator" was applied for dry magnetic separation to obtain iron concentrate powder and cement clinker.

[0018] The particle size of coke powder and oli...

Embodiment 3

[0020] A method for producing iron fine powder and cement with weakly magnetic iron ore. The weak magnetic iron ore is a limonite in Inner Mongolia, and its main chemical components are: TFe is 34.79wt%, FeO is 3.24wt%, P is 5.43wt%, SiO 2 16.37wt%, Al 2 o 3 3.04wt%, CaO 2.18wt%, MgO 5.32wt%, particle size 2-0mm.

[0021] The technical solution adopted in this embodiment is: first mix 65-76wt% of weak magnetic iron ore, 5-7wt% of coal powder, 4-7wt% of coke powder, 3-6wt% of graphite powder and 10-15wt% The limestone is fully mixed; then the above-mentioned mixture is pressed into a φ20×30mm cylinder on a press for roasting, the roasting temperature is 1300-1350°C, the roasting time is 1.5-2.0h, sealed and cooled to room temperature; then the roasted material is broken , dry grinding to below 25 μm; finally, the patented technology of "a micro powder dry magnetic separator" applied by the applicant on the same day is used for dry magnetic separation to obtain iron concentra...

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Abstract

The invention relates to a method using weak magnetic iron ore for producing fine iron powder and cement. The technical scheme thereof is as follows: firstly, 55 to 88 percent of weak magnetic iron ore, 10 to 25 percent of reducing agent and 10 to 20 percent of fusing agent by weight are mixed; secondly, the mixture is agglomerated and then is calcinated, the calcination temperature ranges from 1250 to 1450 DEG C, the calcination time ranges from 0.5 to 2.5 hours, and the calcinated mixture is sealed and cooled to room temperature; thirdly, the calcinated material is crushed and then is drily ground to be less than 25 micrometers; and finally, a micro powder dry magnetic separator is used for dry magnetic separation so as to obtain fine iron powder and cement clinker. The weak magnetic iron ore includes the following chemical components by weight: 20 to 55 percent of TFe, no more than 5 percent of FeO, 0.1 to 5.5 percent of P, 10 to 40 percent of SiO2, 1 to 15 percent of Al2O3, 0.5 to 15 percent of CaO and 0.1 to 10 percent of MgO. The TFe grade of the fine iron powder produced by the invention is higher than 70 percent, and the metal recovery rate is higher than 85 percent; therefore, the invention has the advantages of simple process, high concentrate grade, and high recovery ratio of metallic iron, besides, weak magnetic tailings can be used as cement clinker.

Description

technical field [0001] The invention belongs to the technical field of weak magnetic iron ore beneficiation. In particular, it relates to a method for producing iron fine powder and cement with weak magnetic iron ore. Background technique [0002] With the rapid development of the domestic iron and steel industry in recent years, the demand for iron ore continues to increase. Due to the characteristics of "poor, fine, and miscellaneous" iron ore resources in my country, the iron concentrates obtained by sorting are not only of low quality, but also of high cost. This forces enterprises to focus on the new processing technology with simple sorting process, comprehensive utilization, low comprehensive processing cost, energy saving and environmental protection. [0003] Magnetization roasting is a process in which materials or ores undergo physical and chemical reactions in a corresponding atmosphere after being heated to a certain temperature. For fine-grained oolitic hema...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C04B7/43B03C1/00
Inventor 杨大兵吴明
Owner WUHAN UNIV OF SCI & TECH
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