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Method for producing sintered ore, method for producing raw material for sintering, granulated pellet, and sintered ore

A manufacturing method and technology of sintered ore, applied in the manufacture of sintered ore, the manufacture of raw materials for sintering, granulation particles and the field of sintered ore, can solve the problems that the improvement effect of low-temperature strength is not obvious, achieve good low-temperature air permeability, and improve the production efficiency. Granularity, strength-enhancing effect

Active Publication Date: 2006-11-15
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, when the method disclosed in the above-mentioned patent document 3 is implemented by using fine-powder limonite ore as iron ore, the effect of improving the low-temperature strength is not obvious

Method used

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  • Method for producing sintered ore, method for producing raw material for sintering, granulated pellet, and sintered ore
  • Method for producing sintered ore, method for producing raw material for sintering, granulated pellet, and sintered ore
  • Method for producing sintered ore, method for producing raw material for sintering, granulated pellet, and sintered ore

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no. 1 approach

[0110] Figure 16 Indicates the measurement results of the low-temperature strength and reduction powderability of the sintered body. It can be seen that, by adopting the production method of this embodiment, the low-temperature strength is good, and the strength after reduction can be improved. Table 5 shows the use of Figure 15 The results of sintering experiments were carried out on the granulated particles manufactured by the method. From this, it can be seen that by adopting the method of the present invention (first embodiment: granulation experiment No. 3), productivity, low-temperature strength (shutter strength, reduced pulverization (RDI)), and yield can be improved at the same time.

[0111] Experiment No.

No.1

No.2

No.3

Granulation method

Uniform granulation

External granulation type

first embodiment

Average wind speed (m / s)

3.19

3.36

4.32

Yield(%)

81.1

76.7

78.6

Sh...

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Abstract

A method for producing a sintered ore (50a) which comprises forming, on the surface of a nucleus particle (51) containing an iron ore, a first coating layer (52) using an iron-containing substance and optionally an SiO2-containing material, and subsequently a second coating layer (53) using limestone and a solid fuel based material, to prepare a granulated particle (50), and then sintering the granulated particle (50), wherein the iron-containing substance used for forming the first coating layer (52) has a porosity of 20 % or less or has a porosity of 20 % or less and a content of Al2O3 of 2.1 mass % or less, and wherein the iron ore for the nucleus particle has a porosity higher than that of the iron-containing substance used for the first coating layer (52) or has a porosity and / or a content of Al2O3 higher than that or those of the iron-containing substance.

Description

technical field [0001] The present invention relates to a method for producing raw materials for sintering, a method for producing raw materials for sintering, granulated particles and sintered ore, and in particular to a sintering machine suitable for producing sintered ore for blast furnaces using a Traw's sintering machine which is sucked below. Effective technologies such as granulation technology for sintered raw materials used. Background technique [0002] In the iron and steel industry, due to the depletion of high-quality low-phosphorus iron ore in recent years, the iron ore used has been switched to limonite-based ore. In addition, the crystal water of limonite-type ore is 6% by mass or more. Considering the limit of mining capacity, it is assumed that the crystal water is 3% by mass or more, and the fine powder containing 25% by mass or more of the fine powder part with a particle size of 0.25mm or less Limonite ore. [0003] When fine powder limonite ore is use...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/245
CPCC22B1/245C22B1/16
Inventor 大山伸幸佐藤秀明町田智植木保昭
Owner JFE STEEL CORP
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