Hierarchical material distribution reduction method for sponge iron tunnel kiln and tunnel kiln applying same

A layered cloth, tunnel kiln technology, applied in the field of metallurgy and mineral engineering

Active Publication Date: 2014-07-23
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The deficiencies of iron ore tunnel kiln direct reduction: (1) The grade of iron ore raw materials is relatively high, generally 66-68%
(3) The heat generated by the combustion of the fuel in the tunnel kiln first needs to transfer the heat to the reduction tank through radiation and convection, and then the reduction tank transfers the heat to the iron concentrate powder and reduced coal powder through conduction. The production process The heat utilization rate is low

Method used

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  • Hierarchical material distribution reduction method for sponge iron tunnel kiln and tunnel kiln applying same
  • Hierarchical material distribution reduction method for sponge iron tunnel kiln and tunnel kiln applying same
  • Hierarchical material distribution reduction method for sponge iron tunnel kiln and tunnel kiln applying same

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Effect test

Embodiment 1

[0026] Example 1: 0 ~ 3mm size range iron ore

[0027] 1. Selection of materials

[0028] The raw material of this process is representative low-grade refractory iron ore, the iron grade is 31-35%, SiO 2 The content is 25-48%, the particle size is 0-3mm; the iron ore reduction coal chooses blue carbon or anthracite with a fixed carbon content of more than 74% and a particle size of 1-3mm; the limestone particle size used for the reduction reaction and oxygen increase is 3-5mm ; The particle size of the reduced carbon residue is 1-3 mm.

[0029] 2. Grading and batching of particle size

[0030] The iron ore with a particle size of 0-3mm is divided into two particle size ranges of 0-1mm and 1-3mm by screening method.

[0031] The iron ore with a particle size range of 0-1mm and the reduced coal with a particle size range of 1-3mm are mixed according to the ratio of 100:25-35 to obtain fine-grained materials. The iron ore with a particle size range of 1-3mm and the reduce...

Embodiment 2

[0039] Example 2: 0 ~ 20mm size range iron ore

[0040] 1. Selection of materials

[0041] The raw material of this process is representative low-grade refractory iron ore, the iron grade is 31-35%, SiO 2 The content is 25-48%, the particle size is 0-20mm; the iron ore reduction coal chooses blue carbon or anthracite with a fixed carbon content of more than 74% and a particle size of 1-3mm; the limestone particle size used for the reduction reaction and oxygen increase is 5-10mm ; The particle size of the reduced residual carbon is 1-3mm.

[0042] 2. Grading and batching of particle size

[0043]The iron ore with a particle size of 0-20mm is divided into four particle size ranges of 0-1mm, 1-5mm, 5-10mm and 10-20mm by screening method.

[0044] Mix the iron ore with a particle size range of 0-1mm and 1-5mm and the reduced coal with a particle size range of 1-3mm according to the ratio of 100:25-35 to obtain materials with a particle size of 0-1mm and a particle size of ...

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Abstract

The invention discloses a hierarchical material distribution reduction method for a sponge iron tunnel kiln and the tunnel kiln applying the hierarchical material distribution reduction method. Materials to be reduced are divided into different grades according to the particle size range, the materials, in different grades, to be reduced are respectively mixed with reducers to form mixed materials, the mixed materials are tiled on a table board of a tunnel kiln car in layers, the particle size range of the materials to be reduced in each layer is gradually increased from the bottom layer to the top layer, and the kiln car carries out reduction by passing through a preheating zone, a roasting zone and a cooling zone in the tunnel kiln after the materials are tiled. By adopting the hierarchical material distribution reduction method, iron ores in different particle sizes can be uniformly reduced during reduction from the upper layer to the bottom layer and in a process of oxygenating for the upper layer by the lower layer in the tunnel kiln; ash of a reduced carbon layer can leak into the lower part from an isolation pore plate, and magnetic separation quantity of a magnetic separation step for the reduced materials after drawing is reduced; and a heat exchanger specially used for the tunnel kiln and a fan are arranged, so that a reducing gas is fully utilized, burning gas does not need to be additionally supplemented, and cost is reduced.

Description

technical field [0001] The patent relates to the technical field of metallurgy and mineral engineering, and relates to a layered cloth reduction method of a sponge iron tunnel kiln and the tunnel kiln. Background technique [0002] At present, the technology used in domestic coal-based direct reduction iron tunnel kiln is to mix fine ore powder, coal powder and limestone powder according to a certain proportion and put them into the reduction tank, then put the reduction tank on the kiln car and push it into the tunnel kiln Inside. In the tunnel kiln, the reduction tank is heated by the pre-heating zone to 1150-1250°C, and then enters the roasting zone for reduction and roasting. After cooling down to below 200°C, the reduction tank is taken out from the tunnel kiln. After grinding and magnetic separation, the low-grade direct reduced iron can be used as raw material for blast furnace after being mixed with pulverized coal and hot pressed. Iron powder can also be used as r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00F27B9/00F27B9/30
Inventor 王明华雷鹏飞权芳民展仁礼张志刚鲁逢霖边立国寇明月李慧春
Owner JIUQUAN IRON & STEEL GRP
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