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Method of granulation treatment of raw material for iron making and granulation treatment agent for iron making

A treatment method and treatment agent technology, applied in the direction of improving process efficiency, etc., can solve the problems of reduced strength, deterioration of granulation properties of sintered raw materials, and inability to improve simulated granulation performance.

Inactive Publication Date: 2003-11-19
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is a problem that these substances do not have sufficient simulated granulation when producing sintered ore
Also, even if quicklime is added at 2% by weight or more, there is a tendency that the effect of the simulated granulation performance cannot be improved any more.
[0012] The recent problem is that the quality of fine ore has been depleted and the quality of fine ore has been depleted, and the granulation of sintered raw materials has deteriorated compared to before.
Therefore, the raw particles are soft, so they are easy to deform, and the air permeability in the drying process deteriorates. In order to perform sufficient drying, it takes a long time, which in turn reduces the strength.
In addition, bentonite contains many impurities such as silicon, which will cause problems such as increased slag in molten iron and molten steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0426] Sintered raw materials (raw materials for iron making) having the compositions shown in Table 1 were prepared.

[0427] Composition of raw materials for sintering

Mixing ratio (%)

Niyuman powder ore

20.5

roebriva powder ore

16.5

Karajasu powder ore

13.0

Hamasura powder ore

11.5

Godremuk Powder

10.0

riodse powder ore

3.5

Sintered ore powder

5.0

serpentine

2.0

Silica

1.0

limestone

17.0

Total new raw materials for sintering

100.0

return mine

15.0 (external addition)

powder coke

4.0 (external addition)

[0428]Add 1,400 parts of ground calcium carbonate with an average particle diameter of 2 μm as particles to 70,000 parts of the above-mentioned sintered raw material, put it into a drum mixer, and stir in advance for 1 minute at a rotation speed of 24 / min to obtain a granu...

Embodiment 2

[0431] The granulation process was performed in the same manner as in Example 1, except that 1,400 parts of light calcium carbonate with an average particle diameter of 0.15 μm was used instead of heavy calcium carbonate with an average particle diameter of 2 μm in Example 1. See Table 2 for details of the blending conditions of the fine particles and dispersants used.

[0432] Simultaneously with measuring the water contained in the simulated particles obtained, the simulated particles were classified using a sieve in the same manner as in Example 1, thereby obtaining the average particle diameter and GI index of the simulated particles. Furthermore, the amount of dispersed fine particles was determined by the above-mentioned dispersibility test. These results are summarized in Table 3.

Embodiment 3

[0434] Instead of the ground calcium carbonate with an average particle diameter of 2 μm in Example 1, 1400 parts of ground calcium carbonate with an average particle diameter of 20 μm were used as fine particles, and the same operation as in Example 1 was performed for granulation. See Table 2 for details of the blending conditions of the fine particles and dispersants used.

[0435] Simultaneously with measuring the water contained in the simulated particles obtained, the simulated particles were classified using a sieve in the same manner as in Example 1, thereby obtaining the average particle diameter and GI index of the simulated particles. Furthermore, the amount of dispersed fine particles was determined by the above-mentioned dispersibility test. These results are summarized in Table 3.

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Abstract

A method for the granulation treatment of raw materials for iron making, characterized in that a composition for the granulation treatment comprising raw materials for iron making (sintering materials or pelletizing materials) is subjected to a granulation treatment (quasi-granulation or pelletization) by the use of a composition compounded in a manner such that when the composition is dispersed in water at a predetermined proportion, the amount of fine particles floating in water after a predetermined period of time elapsed is 2 wt % or more relative to the solids of the composition used. The method can be suitably used for subjecting raw materials for iron making to a granulation treatment at a low cost, to thereby produce a quasi-granulated or pelletized composition of raw materials.

Description

field of invention [0001] The present invention relates to a method for producing sintered ore as a raw material for iron-making or a method for producing pellets, and in particular, relates to a method for granulating the raw material for iron-making by adjusting the water content of the raw material for iron-making. The granulation treatment method and the granulation treatment agent for iron-making are suitable for simulating granulation or granulation of iron-making raw materials. Background technique [0002] When producing sintered ore, firstly, iron ore, auxiliary raw materials, fuel, etc., which are raw materials for sintering, are mixed, and the water content is adjusted with a granulator such as a roller mixer, a granulator, and an Erlich mixer. Granulation, making simulated particles. The so-called simulated particles are generally particles with particles below 0.5mm attached to 1-3mm core particles. At this time, the role of gran...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/242C22B1/244C22B7/02
CPCC22B1/2406C22B1/244C22B7/02C22B1/242Y02P10/20C22B1/16
Inventor 冈田务细谷阳三冈崎润品川和之铃木治久河野克之本山厚司中元桂一三浦悟
Owner NIPPON STEEL CORP
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