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Gas base shaft-furnace direct reduction method for strengthening iron ore pellets

A gas-based shaft furnace and oxidizing pellet technology, which is applied to shaft furnaces, furnaces, furnace types, etc., can solve the problems of reduced efficiency, deteriorated adhesion, material layer permeability, uneven temperature distribution of the shaft furnace, and affecting the normal operation of the shaft furnace. , to achieve the effect of alleviating the material and speeding up the reduction rate

Inactive Publication Date: 2013-01-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the iron ore pellets produced during the reduction process will deteriorate the air permeability of the material layer and the uneven temperature distribution inside the shaft furnace, which will affect the normal operation of the shaft furnace and reduce the efficiency.
In addition, the cohesion of the pellets during the reduction process is also a key factor limiting the further increase of the operating temperature of the shaft furnace.

Method used

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  • Gas base shaft-furnace direct reduction method for strengthening iron ore pellets
  • Gas base shaft-furnace direct reduction method for strengthening iron ore pellets

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Mix 500g iron ore oxidized pellets (12mm~16mm) with 22.1g (accounting for 4.2% of the total amount of the mixture) of biochar (average particle size 10mm) and mix them evenly, then add them to the shaft furnace, and heat them at a temperature of 1000°C , the atmosphere is 90% CO, 2% CO 2 , 8%N 2 (Volume percent) The reduction rate of the metallized pellet sample obtained after reduction for 90 minutes was 88.62%, and the cohesion index was 37.85%.

Embodiment 2

[0030] Example 2: Take 460g of iron ore oxidized pellets (12mm-16mm) and 40g (accounting for 8% of the total amount of the mixture) of biochar (average particle size 2mm) and mix them evenly, then add them to the shaft furnace, at a temperature of 800 ° C, The atmosphere is 90%CO, 2%CO 2 , 8%N 2 (Volume percent) The reduction rate of the metallized pellet sample obtained after reduction for 180 minutes was 89.77%, and the cohesion index was 15.90%.

Embodiment 3

[0031] Example 3: Mix 500g iron ore oxidized pellets (12mm~16mm) with 22.1g (accounting for 4.2% of the total amount of the mixture) of biochar (average particle size 10mm) and mix them evenly, then add them into the shaft furnace, and heat them at a temperature of 1000°C , the atmosphere is 60%CO, 30%H 2 , 2%CO 2 , 8%N 2 (Volume percent) The reduction rate of the metallized pellet sample obtained after reduction for 30 minutes was 88.94%, and the cohesion index was 11.77%.

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Abstract

The invention discloses a gas base shaft-furnace direct reduction method for strengthening iron ore pellets. The method comprises the following steps of (1) evenly mixing iron ore oxidation pellets and biomass charcoal ingredients, and enabling ingredients in a mixing material by weight to be 92%-99% of iron ore pellets and 1%-8% of biomass charcoal; and (2) adding the mixing material in a shaft furnace, conducting gas base direct reduction for 0.5 to 3 hours at the temperature of 800 DEG C-1000DEG C to obtain metallized pellets. The gas base reduction of the biomass strengthening iron ore pellets is adopted, bonding degree of the pellets in a reduction process is effectively reduced while reduction rate is improved, and utilization efficiency and running states of the shaft furnace are greatly improved.

Description

technical field [0001] The invention relates to a method for strengthening reduction of iron ore pellets, in particular to a method for strengthening gas-based reduction and preventing direct reduction metallized pellets from bonding. Background technique [0002] The production of sponge iron by the direct reduction method is a "short-process" process of electric furnace steelmaking, which has the characteristics of low energy consumption, high labor productivity and is conducive to environmental protection, so it is regarded as the third revolution of the iron and steel industry. From a global perspective, with the increasing output of electric furnace steel and the serious shortage of high-quality steel scrap, the future demand for direct reduced iron in the world will continue to grow. [0003] Looking at all the current direct reduction process technologies in the world, the gas-based shaft furnace direct reduction process Midrex and HYL-Ⅲ have become the absolute mains...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C22B1/24
CPCY02P10/20
Inventor 黄柱成姜涛易凌云张元波郭宇峰李光辉杨永斌
Owner CENT SOUTH UNIV
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