Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder

A technology for metallizing iron powder and carbon pellets, applied in the field of iron and steel metallurgy, can solve the problems of poor high-temperature metallurgy performance, reduced output, increased energy consumption, etc. Effect

Active Publication Date: 2015-03-04
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of low strength of carbon-containing pellets and poor high-temperature metallurgical properties in the prior art, which lead to reduced output and increased energy consumption of metallurgical equipment such as blast furnaces, and to provide a production method using direct reduction metallized iron powder. The method of iron hot-pressing carbon-containing pellets meets the needs of metallurgical equipment such as blast furnaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Selection of metallized iron powder

[0020] In the production of iron hot-pressed carbon-containing pellets, the metallization rate of direct reduced iron powder is 90%, and the particle size is -200 mesh 60%.

[0021] 2. Selection of coal type

[0022] The coal type is caking coal with a caking index greater than 1.5. The colloid thermal stability of the coal is 140°C, the fixed carbon content in the coal is above 65%, and the particle size range is 0.2mm.

[0023] 3. Mixing of materials

[0024] Metallized iron powder and coal powder with moisture content less than 3% are mixed according to 75:25, and the prepared materials should be stirred evenly.

[0025] 4. Preheating of mixed materials

[0026] The mixed material is fed into the heating equipment, and under the action of high temperature in the furnace, the temperature of the mixed material is raised to 450°C.

[0027] 5. Insulation of mixed materials

[0028] After the mixed material is kept at a temper...

Embodiment 2

[0035] 1. Selection of metallized iron powder

[0036] In the production of iron hot-pressed carbon-containing pellets, the metallization rate of direct reduced iron powder is 90%, and the particle size is -200 mesh 65%.

[0037] 2. Selection of coal types

[0038] The coal type is caking coal with a caking index greater than 1.5. The colloidal thermal stability of the coal is 140°C, the fixed carbon content in the coal is above 65%, and the particle size range is 0.25mm.

[0039] 3. Mixing of materials

[0040] Metallized iron powder and coal powder with a moisture content of less than 3% are mixed according to the ratio of 70:30, and then water glass with a total weight of 0.8% of metallized iron powder and coal powder is added, and the prepared materials should be stirred evenly.

[0041] 4. Preheating of mixed materials

[0042] The mixed material is fed into the heating equipment, and under the action of high temperature in the furnace, the temperature of the mixed mat...

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Abstract

The invention provides a method for producing iron hot-pressed carbon-containing pellets through direct reduction on metallized iron powder. The method for producing the iron hot-pressed carbon-containing pellets through the direct reduction on the metallized iron powder comprises the following steps: adding direct reduction iron powder with metallization ratio about 90% into equipment, such as a blast furnace to be utilized, manufacturing the metallized iron powder into pellets with a certain metallurgical performance before use, according to the caking property of coal and the characteristic related to temperature of the coal, mixing the metallized iron powder with coal dust in a certain proportion and then carrying out hot pressing at the temperature about 450 DEG C, so that the coal and metalized iron powder particles are fully contacted and caked, and a heat treatment technique at the temperature about 700 DEG C is adopted for improving strength of the iron hot-pressed carbon-containing pellets, so that the produced iron hot-pressed carbon-containing pellets have good compressive strength and metallurgical performance.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a production method of carbon-containing pellets, in particular to a method for producing iron hot-pressed carbon-containing pellets by direct reduction of metallized iron powder, which is widely used in blast furnaces, electric furnaces, and cupolas and other equipment. Background technique [0002] In the production of equipment such as blast furnaces, the basic requirement for raw materials is that they should have a certain compressive strength. At present, the production of iron hot-pressed carbon-containing pellets in China mainly uses high-grade iron ore concentrate as raw material, and its main production methods include cold-solidified carbon-containing pellets and hot-pressed carbon-containing pellets. (1) Cold-consolidated pellets are mainly used in direct reduction or smelting reduction processes. It is made of iron concentrate with a certain proportion of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 王明华权芳民雷鹏飞展仁礼鲁逢霖张志刚马胜军胡明
Owner JIUQUAN IRON & STEEL GRP
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