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Method for reducing high-density metallized pellet

A metallized pellet and high-density technology, applied in the field of metallurgy, can solve problems such as poor quality, low density, and low output, and achieve the effects of stable production process, reduced production cost, and increased metallization rate

Active Publication Date: 2014-05-07
江苏靖隆合金钢机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low output, poor quality and low density of existing reduced iron products in my country, the present invention provides a reduction method for high-density metallized pellets, which can produce iron pellets with a density of 3.8-4.2 t / m 3 Between the high-density metallized pellet product, the method of the present invention carries out according to the following steps:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A reduction method of high-density metallized pellets is carried out in the following steps:

[0030] (1) Process the high-grade iron ore powder to be reduced to 160 mesh to 200 mesh, and mix it evenly with internal carbon powder and organic binder. The mixed iron material is 91.5% by weight of iron ore powder or iron scale. 8.0% carbon powder, 0.5% binder; then spray water to form pellets of ￠12-16mm;

[0031] (2) Mix the compressed mixture pellets with reducing agent coal powder to make the material to be reduced; the mass ratio of reducing agent to pellets is 30:70;

[0032] (3) Put the material to be reduced into the reduction container and then put it into the reduction kiln, or put the material to be reduced directly into the reduction furnace, and carry out the reduction reaction at a temperature of 1235±5°C, and the reduction time is 7.6 h;

[0033] (4) After the reaction is completed, the materials in the kiln car are naturally cooled to about 200°C, and the ...

Embodiment 2

[0045] A reduction method of high-density metallized pellets is carried out in the following steps:

[0046] (1) Process the high-grade iron ore powder to be reduced to 160 mesh to 200 mesh, and mix it evenly with internal carbon powder and organic binder. The mixed iron material is iron ore powder or iron scale 94.6%, internal With 5.0% carbon powder and 0.4% binder; then spray water to form pellets of ￠12-16mm;

[0047] (2) Mix the compressed mixture pellets with reducing agent coal powder to make the material to be reduced; the mass ratio of reducing agent to pellets is 30:70;

[0048] (3) Put the material to be reduced into the reduction container and then put it into the reduction kiln, or put the material to be reduced directly into the reduction furnace, and carry out the reduction reaction at a temperature of 1240±5°C, and the reduction time is 6.6 h;

[0049] (4) After the reaction is completed, the materials in the kiln car are naturally cooled to about 200°C, and ...

Embodiment 3

[0061] A reduction method of high-density metallized pellets is carried out in the following steps:

[0062] (1) Process the high-grade iron ore powder to be reduced to 160 mesh to 200 mesh, and mix it evenly with internal carbon powder and organic binder. 6% carbon powder, 0.4% binder; then spray water to form pellets of ￠12-16mm;

[0063] (2) Mix the compressed mixed material pellets with the reducing agent coal powder to make the material to be reduced; the mass ratio of the reducing agent to the pellets is 25:75;

[0064] (3) Put the material to be reduced into the reduction container and then put it into the reduction kiln, or put the material to be reduced directly into the reduction furnace, and carry out the reduction reaction at a temperature of 1235±5°C, and the reduction time is 7.6 h;

[0065] (4) After the reaction is completed, the materials in the kiln car are naturally cooled to about 200°C, and the materials in the material basin are taken out, and the tail ...

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Abstract

The invention relates to a method for reducing a high-density metallized pellet, belonging to the technical field of metallurgy. The method comprises the following steps: (1) preparing a pellet by proportionally and uniformly mixing iron ore powder to be reduced, carbon powder to be contained and a bonding agent; (2) preparing a material to be reduced by proportionally mixing the pellet and a reducer; (3) putting the material to be reduced into a reduction container, then transferring into a reduction kiln, and performing reduction reaction at 1220-1260 DEG C for 6-8 hours; and (4) after the reaction, naturally cooling the material in a kiln car to 200 DEG C, separating the reducer tailing and the metal pellet, performing surface sanding, and cleaning to obtain the high-density metallized pellet product of which the density is 3.8-4.2 t / m<3>. According to the method provided by the invention, the original kiln reduction operation is not changed, the reduced iron does not need to be crushed and subjected to cold briquetting, the production cost can be lowered, the energy consumption can be reduced, the steel making application is facilitated, the production process is stable, and the metallization rate is improved. Thus, the method provided by the invention has favorable application prospects.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for reducing high-density metallized pellets. Background technique [0002] At present, the total annual reduced iron (sponge iron, metallized pellets) in China is about 500,000 tons, accounting for less than 0.8% of the world's total output. China's coal-based direct reduction production process mainly adopts the coal-based tunnel kiln-tank method, and there are also a small amount of coal-based rotary kiln method and coal-based shaft furnace method. Among them, only the coal-based tunnel kiln-tank method is relatively stable and mature. Item distribution is relatively common. [0003] The coal-based tunnel kiln tank method has the problems of large investment and large floor area, and expensive refractory tanks must be used; due to backward technology, high energy consumption, long reduction time, and high labor consumption, the product needs to be cold-pressed int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243C21B13/00
Inventor 陶立群唐竹胜
Owner 江苏靖隆合金钢机械制造有限公司
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