Method for promoting magnetization reduction of oxidized iron ore with weak magnetism

A technology of iron oxide ore and weak magnetism, which is applied to the improvement of process efficiency, can solve the problems of iron oxide ore magnetization reduction rate reduction, difficult monomer dissociation of iron minerals, and difficulty in iron mineral separation, so as to avoid Effects of mutual sintering, process cleaning, and temperature reduction

Inactive Publication Date: 2010-08-11
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

Therefore, carbothermal reduction is affected by the carbon gasification process, which usually has a low mass transfer efficiency
[0007] (2) For refractory red iron ore with complex composition, there are often a large amount of SiO in the ore 2 and Al 2 o 3 and other impurities, it is easy to react with metal Fe to form fayalite (Fe 2 SiO 4 ) and iron s

Method used

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  • Method for promoting magnetization reduction of oxidized iron ore with weak magnetism
  • Method for promoting magnetization reduction of oxidized iron ore with weak magnetism
  • Method for promoting magnetization reduction of oxidized iron ore with weak magnetism

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Example 1 In order to confirm that metal Fe is in H 2 Hematite can be magnetized and reduced indirectly under the promotion of O. A special magnetization-reduction roasting verification experiment was designed.

[0050] The experiment was carried out in a box-type resistance furnace. 20g of pure iron powder with a particle size of 0.6mm and 100g of pure hematite samples were placed separately in a sealed steel cylinder to keep the pure iron powder and pure hematite from direct contact. Add 10g of water or no water to the hematite, and then roast it in a reduction roasting furnace at 560 °C for 60 min. After reduction roasting, the samples were subjected to X-ray diffraction analysis, and compared with the X-ray diffraction analysis results of the samples before reduction roasting. . At the same time, the magnetic susceptibility reduction rate of hematite was analyzed with a magnetic separator.

[0051] figure 1 The results of X-ray diffraction analysis of pure hemati...

Embodiment 2

[0053] Example 2 The magnetization reduction roasting comparison experiment was carried out by using the slag obtained from pyrite for acid production as the weak magnetic iron oxide mineral material. The chemical composition of the pyrite slag is shown in Table 1, and the iron phase composition is shown in Table 2.

[0054] Table 1 Results of chemical multi-element analysis of slag (mass fraction) / %

[0055]

[0056] Table 2 Phase composition of iron in slag (mass fraction) / %

[0057]

[0058]

[0059] The experiment was also carried out in a box-type resistance furnace. Two equal pyrite slag samples (with a particle size of 3 mm) were taken each time, and one was added with 10% water, 5% waste iron wire and 5% slag mass. 15% of the calcined slag mass was added, and the other part was reduced and roasted for 60 min at different temperatures in Table 3, and then the magnetic separation performance of the calcined calcined was evaluated by a weak magnetic separator. ...

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Abstract

The invention relates to a method for promoting magnetization reduction of oxidized iron ore with weak magnetism. The method comprises the following steps of: (1) crushing an oxidized iron ore material with weak magnetism; (2) adding water in an amount which is 5 to 10 mass percent of the oxidized iron ore with weak magnetism; (3) according to the ferrous grade of the oxidized iron ore with weak magnetism, adding a scrap iron material serving as a reducing agent in an amount which is 3 to 20 mass percent of the oxidized iron ore with weak magnetism, and according to requirement, adding a carbon reducing agent in an amount which is 0 to 15 mass percent of the oxidized iron ore with weak magnetism; and (4) putting the materials in a reduction roaster for roasting to convert the oxidized iron ore with weak magnetism into magnetite with strong magnetism. The method has the advantages that: (1) the method can improve the mass transfer efficiency of the magnetization reduction reaction and reduce the temperature required by the reduction reaction; (2) the method can prevent the formation of iron aluminosilicate ore with weak magnetism and avoid mutual sintering between the iron ore and aluminosilicate impurity ore; and (3) the method can reduce the consumption of the reducing agent and has cleaner process.

Description

technical field [0001] The invention relates to a technological method for changing the magnetic separation performance of weak magnetic iron oxide ore by using scrap iron material as a reducing agent and using water vapor to promote the transformation of weak magnetic iron oxide ore into strong magnetic magnetite. Background technique [0002] Although there are many types of iron-bearing minerals, under the current technical conditions, only magnetite, hematite, maghemite, ilmenite, limonite and siderite have industrial application value. Among them, magnetite has a larger specific susceptibility and is a strong magnetic iron mineral, while other iron minerals have a smaller specific susceptibility and belong to a weak magnetic iron mineral. [0003] Weak magnetic iron oxide ore is usually called red iron ore. China's red iron ore resources generally have low iron content, complex mineral composition, fine-grained distribution of iron minerals, and difficult sorting and pr...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCY02P10/20
Inventor 张泽强胡文祥沈上越李冬莲
Owner WUHAN INSTITUTE OF TECHNOLOGY
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