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Sintering material granulation method using x-ray ct

A technology of X-rays and raw materials, applied in the field of sintered ore manufacturing, can solve the problems of reducing, not mentioning the amount of water added, not mentioning the spatial resolution of CT, etc., and achieve the effect of maintaining air permeability and improving quality

Active Publication Date: 2013-07-31
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, in this patent document 3, there is no mention at all of a method of appropriately controlling the amount of water added during granulation by using X-ray CT.
Moreover, there is no mention of a method for properly setting the voltage of the X-ray source tube to ensure sufficient penetration of the high-density substances constituting the granules
In addition, there is no mention of a method for suppressing the decrease in CT spatial resolution caused by long-wavelength (low-energy) components contained in X-rays

Method used

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Embodiment

[0144] The iron ores of each variety shown in Table 1 were adjusted to the particle size distribution shown in Table 2, and these iron ores were mixed to prepare samples. 3 kg of this sample was put into a batch drum mixer with an inner diameter of 300 mmφ and a depth of 140 mm, water was added, and granulation was performed at a rotation speed of 24 rpm and a granulation time of 4 minutes to obtain a granulated product sample.

[0145] [Table 1]

[0146] Ore A

Bean stone ore from Haozhou

Ore B

Marra Mamba Ore

Ore C

Bean stone ore from Haozhou

Ore D

High phosphorus Brockman (Blockman) ore

Ore E

indian ore

Ore F

Brazilian hematite ore

Ore G

Brazilian hematite ore

[0147] [Table 2]

[0148] Particle size (mm)

Proportion(%)

5～10

15.4

2～5

23.0

1～2

15.0

0.5～1

12.2

0.25～0.5

10.6

-0.25

23.8

...

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Abstract

A sintering material granulation method using X-ray CT comprises a granulation step, in which water is added and sintering material is granulated; a granulated material measurement step, in which the weight (M) of the granulated material is measured, and the volume (V) of the granulated material is found from a CT sectional image; a dried material measurement step, in which, after the granulated material measurement step, the granulated material is dried and the weight (m) of the dried granulated material and the true density (?0) of the dried granulated material are measured; and a water adjustment step, in which the water saturation (S) is found from the weight (M), the volume (V), the weight (m), and the true density (?0), and then the quantity of the water to be added to the sintering material is adjusted so that this water saturation (S) is not less than 0.9 and not more than 1.05.

Description

technical field [0001] The invention relates to a method for producing sintered ore used as the main raw material of a blast furnace in the iron-making process. In particular, it relates to a method of granulating sintered raw materials by taking X-ray CT cross-sectional images of granulated sintered raw materials by X-ray CT, and determining and managing the optimum moisture content during granulation based on the images. [0002] this application claims priority based on Japanese Patent Application No. 2008-335323 for which it applied to Japan on December 26, 2008, and uses the content here. Background technique [0003] The sintered ore for blast furnace raw material is usually produced by the following method. First, an auxiliary material containing CaO such as lime powder, and an auxiliary material containing SiO such as silica or serpentinite are mixed with iron ore powder. 2 Auxiliary raw materials and carbon materials such as coke powder are used to prepare sintere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/244F27B21/14G01N23/04
CPCC22B1/24F27B21/00C22B1/205C22B1/2406C22B1/16C22B1/244F27B21/04G01N23/04
Inventor 河内慎治笠间俊次
Owner NIPPON STEEL CORP
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