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Periodic oxygen-enriched sintering of iron ore

A technology of iron ore and mixture, applied in the direction of improving process efficiency, etc., can solve the problems of poor surface layer quality of sintered body, incomplete coke combustion, poor reducibility and permeability, etc.

Active Publication Date: 2009-12-23
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High content of FeO in sintered body leads to poor reducibility and permeability
Another major problem during sintering by conventional methods is the poor quality of the surface layer of the sintered body due to incomplete combustion of the coke and subsequent rapid cooling

Method used

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  • Periodic oxygen-enriched sintering of iron ore
  • Periodic oxygen-enriched sintering of iron ore
  • Periodic oxygen-enriched sintering of iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] The following is a practical example of the use of oxygen in iron ore sintering according to the invention, wherein the oxygen is introduced at the same flow rate across the entire length of the bed.

Happening

[0040] The following is an example of the practice of using oxygen in the sintering of iron ore according to the invention, where at the start of sintering (that is to say, from the end of the bed where the material to be sintered is initially fed into The oxygen flow rate to the bed) is higher than the oxygen flow rate further along the bed length.

[0041] Provided below according to the present invention in iron ore sintering such as image 3 An example of practice using oxygen and recirculating the flue gas is shown.

degree, meter

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PUM

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Abstract

The invention relates to periodic oxygen-enriched sintering of iron ore. The iron ore is sintered by pumping an oxygen-enriched air atmosphere from previous one tenth to one third of the bed to pass through the bed and by pumping an air atmosphere or a flue gas-enriched air atmosphere to pass through the residual part of the bed, after the iron ore moving bed is ignited.

Description

technical field [0001] The present invention relates to the sintering of iron ore. Background technique [0002] In the production of iron and steel from iron ore it is advantageous to sinter the iron ore before feeding it into a blast furnace. Sintering works by changing the physical state of iron ore, that is, from a loose, fine or even powdery granular state to a relatively solidified state that can be handled and fed more easily when broken into workable pieces , and the iron ore agglomerates (agglomerate). Sintering also enables the introduction of reagents such as fluxes into the mixture with the iron ore. The sintered product is called "sinter". [0003] The strength and reducibility of the sintered body are very important for the performance of the blast furnace. A sintered body with poor strength may crack during handling and charging, reducing the permeability of the material in the blast furnace. The reduced permeability and poor reducibility of the sintered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCY02P10/20
Inventor 王涛J·F·比林汉
Owner PRAXAIR TECH INC
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