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Fuse reducing iron-smelting process for rotating furnace

A technology of rotary hearth furnace and process, which is applied in the field of smelting reduction ironmaking process and related equipment, and can solve problems such as difficulty in popularization

Inactive Publication Date: 2007-04-04
万天骥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is often limited by energy and resource conditions, and it is difficult to achieve promotion

Method used

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  • Fuse reducing iron-smelting process for rotating furnace
  • Fuse reducing iron-smelting process for rotating furnace
  • Fuse reducing iron-smelting process for rotating furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 78 parts (by weight, the same below) of fine iron powder (containing 65% iron), 19 parts of coal dust (13% of ash, 0.65% of sulfur), and 3 parts of binder were mixed and pelletized.

[0019] Dry the resulting balls and put them into a rotary hearth furnace for reduction. The reduction temperature is 1350°C, the treatment time is 15, 20, and 30 minutes, and the achieved metallization rates are 80%, 85%, and 88%, respectively.

[0020] The metallized pellets from the rotary hearth furnace are put into the melting gas-making furnace, and the briquettes are used as fuel to obtain molten iron with Fe 95.6%, C 3.8%, S 0.03%, P 0.07%, and Si 0.5%.

Embodiment 2

[0022] Mix 81 parts (weight, the same below) of fine iron powder (containing 68% iron), 17 parts of coal powder (12% of ash, 0.5% of sulfur), and 2 parts of binder, and make pellets after mixing. The dried balls were added to a rotary hearth furnace for reduction, the reduction temperature was 1300°C, the treatment time was 10, 15, 20, and 30 minutes respectively, and the metallization rates of the obtained metallized pellets were 78%, 81%, and 85% respectively. , 87%.

[0023] The metallized pellets from the rotary hearth furnace are put into the melting gas-making furnace, and the briquettes are used as fuel to obtain the molten iron composition: Fe 95.51%, C 4%, S 0.025%, P 0.065%, Si 0.4%.

[0024] In terms of environmental protection, the present invention has no solid waste discharge in the process, and the dust discharge is less than 100mg / m 3 , can be reduced to 50mg / m after passing through the dust collector 3 (The national standard is 100mg / m 3 ). Since there is ...

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Abstract

An iron smelting process by rotating-furnace melt and reduction is carried out by mixing iron-mine powder with powdered coal to obtain self-reduction palletizing, taking it as raw material, pre-reducing by rotating-furnace to obtain metal pellet with conversion rate >80%, heating, packing it into melt gas maker, finally reducing and melting while separating out iron slag to obtain liquefied iron and gas and utilizing it for hot-air furnace and rotating-furnace gas. It has no environmental pollution, and no need for oxygen and natural gas.

Description

Technical field: [0001] The invention belongs to a smelting reduction ironmaking process and related equipment. Background technique: [0002] Smelting reduction ironmaking is one of the most cutting-edge technologies in the modern ironmaking industry, and it is still in the pioneering stage. Except for the Corex method, which has formed a production scale, the others are in the experimental development. It is still blank in our country. Oxygen and electricity are widely used in various smelting reduction ironmaking methods abroad. The fuel used in foreign rotary hearth furnaces is natural gas, while electric furnaces are mostly used for melting. Therefore, it is often limited by energy and resource conditions, and it is difficult to realize promotion. [0003] The purpose of the present invention is to develop a new two-step smelting reduction ironmaking process that does not use oxygen, does not use natural gas and consumes less electricity for the above situation and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08C22B5/10
CPCY02P10/143
Inventor 万天骥任大宁孔令坛黄务涤郭明威
Owner 万天骥
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