Sintered ore

A technology for sintered ore and iron ore, which is applied in the fields of granulated particles and sintered ore, raw materials for sintering, and the fields of manufacturing methods, which can solve the problems of insignificant improvement of low-temperature strength, and achieve good low-temperature air permeability and improved strength. , Improve the effect of granulation

Active Publication Date: 2010-03-17
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, when the method disclosed in the aforementioned Patent Document 3 is implemented by using fine-powder limonite ore as iron ore, the effect of improving the low-temperature strength is not significant.

Method used

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Experimental program
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no. 1 approach

[0116] 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.

[0117] table 5

[0118] 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

...

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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 andoptionally 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

[0001] This application is a divisional application of the application filed on April 7, 2006 with the application number 200480029381.0 and the title of the invention is "Method for manufacturing sintered ore, method for manufacturing raw materials for sintering, granulated particles and sintered ore". technical field [0002] The present invention relates to a method for producing sintered ore, a method for producing raw materials for sintering, granulated particles and sintered ore, and in particular to a sintered ore used in the production of sintered ore for blast furnaces by using a Traw's sintering machine which is sucked below. Effective technology such as granulation technology of raw materials for sintering. Background technique [0003] 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 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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