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Direct-reduction ironmaking method and system for iron-containing mineral powder

A technology for iron ore powder and reduced iron, which is applied in the field of direct reduction iron-making methods and systems containing iron ore powder, can solve the problems of complex process equipment and low reduction efficiency, and achieves simple reduction process, high reduction efficiency, and shortened reaction time. effect of time

Active Publication Date: 2015-06-03
湖南长拓高科冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a direct reduction ironmaking method and system for iron-containing ore powder to solve the common problems of low reduction efficiency and complicated process equipment in the prior art, and is beneficial to improve the metallization rate

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  • Direct-reduction ironmaking method and system for iron-containing mineral powder
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  • Direct-reduction ironmaking method and system for iron-containing mineral powder

Examples

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Effect test

Embodiment 1

[0054] The oxygen-enriched gas from the gas furnace is passed into the shift furnace, and in the shift furnace (as a gas adjustment unit), the reaction between CO and water vapor is used to consume part of CO and generate hydrogen, and adjust the H 2 The volume ratio of CO and CO is 0.8:1, and the shift gas enters CO 2 Removal unit to remove or reduce most of the CO 2 , so that CO and H 2 The total concentration is about 80%, and then it enters the heating furnace and is heated to about 950°C to complete the preparation of the reducing gas; the limonite powder with an iron grade of about 50% and a particle size of less than 0.05mm enters the cyclone preheater for preheating to At about 700°C, after preheating, it enters the flash reduction furnace. In the flash reduction furnace, the reducing gas contacts the preheated iron-containing ore powder and a reduction reaction occurs at 800°C. After 30-40 seconds, they enter the cyclone separator together, and directly The reduced ...

Embodiment 2

[0056] Pipeline natural gas is passed into the reformer to be catalytically reformed into CO and H 2 mixture, control H 2 And the volume ratio of CO is 1.2:1, CO+H 2 The concentration is about 90%, and the outlet gas temperature of the reforming furnace is controlled at 900°C to complete the preparation of the reducing gas; it enters the flash reduction furnace; the iron powder with an iron grade of about 63% and a particle size of less than 0.074mm enters the cyclone preheating from the metering device The device is preheated to 750°C and enters the flash reduction furnace after preheating. In the flash reduction furnace, the reducing gas contacts the preheated iron-containing ore powder and a reduction reaction occurs at 800°C. After 20-30 seconds, they enter the cyclone separation together. The reduced iron is discharged from the lower part of the cyclone separator, and after cooling, the direct reduced iron is obtained. After testing, the metallization rate of the product...

Embodiment 3

[0058] Pipeline natural gas is passed into the reformer to be catalytically reformed into CO and H 2 mixture, control H 2 and CO volume ratio at 1:1, CO and H 2 The total volume reaches about 75%, and the outlet gas temperature of the reformer is controlled at 1050°C to complete the preparation of the reducing gas; it enters the flash reduction furnace; the hematite powder with an iron grade of 45% and a particle size of less than 0.1mm enters the cyclone from the metering device The preheater is preheated to 500°C and enters the flash reduction furnace after preheating. In the flash reduction furnace, the reducing gas contacts the preheated iron-containing ore powder and a reduction reaction occurs at 850°C. After 100-120 seconds, they enter together The cyclone separator, the reduced iron is discharged from the lower part of the cyclone separator, and after cooling, the direct reduced iron is obtained. After testing, the metallization rate of the product is 95%. The exhaus...

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Abstract

The invention provides a direct-reduction ironmaking method and system for iron-containing mineral powder. The direct-reduction ironmaking method for the iron-containing mineral powder comprises the following steps: S1, carrying out flash reduction on the iron-containing mineral powder with a reducing gas at 800-1,000 DEG C, and finishing reducing reaction within 20-120 seconds to obtain a mixture containing direct-reduced iron and a tail gas; S2 carrying out gas-solid separation on the mixture, and respectively obtaining the direct-reduced iron and the tail gas, wherein the volume sum of hydrogen and carbon monoxide in the reducing gas is greater than 70% of the total volume of the reducing gas. In the implementation process of the method, iron-containing mineral powder is in a suspended flow state, and has great heat and mass transfer ability between a gas and solid; and the heat and mass transfer ability is over 50 times of accumulation state reaction, therefore, the direct-reduction ironmaking system has an extremely high reaction speed; the reaction time can be greatly shortened; the reaction speed can be accelerated by the reducing gas; complete reduction reaction is promoted; an intermediate reduction product is avoided; and improvement of the metal conversion rate is facilitated.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a direct reduction ironmaking method and system for iron-containing ore powder. Background technique [0002] The earliest method for humans to obtain iron was the direct reduction method, but the original process was complex and inefficient, and could not meet the needs of human progress, and was later replaced by the two-step method. With the huge increase of people's demand for steel, the supply of metallurgical coke is becoming increasingly tight, which makes the direct reduction ironmaking process develop again. Classified according to the type of reducing agent, reduction ironmaking methods mainly include gas-based direct reduction ironmaking method using gas reducing agent and coal-based direct reduction ironmaking method using solid reducing agent. In 2006, the world's total output of direct reduced iron reached 59.8 million tons, and in terms of production capacity and actual ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 高泽斌赵沛庄大英李永恒
Owner 湖南长拓高科冶金有限公司
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