Rotary hearth furnace and method for producing reduced metal

A technology of rotating hearth and metal, applied in the direction of hearth furnace, rotary drum furnace, furnace type, etc., can solve the problems of reducing the yield of reduced iron products, stopping the rotation of hearth 1, etc., to improve the yield and prevent low Strength problem, spallation prevention effect

Inactive Publication Date: 2002-07-24
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only lowers the yield of reduced iron products, but also may stop the rotation of the hearth 1 because of the occurrence of sludge-shaped deposits at the bottom of the seal tank 4, so that the lower end of the dome 4a is buried in the deposits

Method used

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  • Rotary hearth furnace and method for producing reduced metal
  • Rotary hearth furnace and method for producing reduced metal
  • Rotary hearth furnace and method for producing reduced metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] In the furnace structure, the hearth diameter of the rotary hearth type furnace is 8.5m, and the hearth width is 1.25m, and there is an inclination with an upward gradient toward the edge of the hearth (side front end) with respect to the overlapping length L, depression angle θ The surface, the embedded cooling water pipe at the lower end of the side wall, the type and installation method of the horizontal edge refractory have been modified differently, and the furnace atmosphere temperature is set at 1400°C or 1200°C and the predetermined time period under each condition (approximately 30 After producing reduced iron within 2 days), the extent of damage to the edge of the hearth and the increase in sludge in the seal tank were investigated. The results are shown in Table 1 below.

[0059]

sample

No

Hearth structure

run

condition

Operation result

...

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PUM

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Abstract

In a rotary hearth furnace for producing reduced metal through heating and reducing carbon containing materials composed of at least metal oxide-containing material and carbon-containing reduction material, a hearth structure is provided by which a refractory in a hearth lateral end is not damaged and carbon containing materials do not fall down to a water sealing section of the rotary hearth furnace. The upper part of a hearth lateral end (1a) is covered with the lower end (2a) of a side wall (2) of a hood covering the whole hearth, and a cooling means (3) is installed in the side wall lower end (2a).

Description

technical field [0001] The present invention relates to a rotary hearth type furnace, and in particular to the structure of the hearth, which produces reduced metals by heating and reducing carbonaceous raw materials consisting of at least metal oxide-containing materials and carbonaceous Restore material composition. Background technique [0002] Recently, the production of steel products using electric arc furnaces has been active, and the demand for reduced iron is gradually increasing due to supply problems of iron filings as the main raw material for steel products or the need for high-quality steel produced by electric arc furnaces. [0003] As one of the methods of producing reduced iron, a well-known method is to mix fine ore and coal raw materials such as pulverized coal or coke to form agglomerated raw materials such as pellets, which are charged into a rotary hearth type furnace and heated At high temperature, the iron oxide in the iron ore is reduced to obtain s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/216C21B11/08C21B13/08C21B13/10C22B1/16C22B5/10F27B9/16F27B9/18F27B9/34F27B9/36F27D1/00F27D1/04F27D1/12F27D99/00
CPCC21B13/10F27D1/0043F27D99/0073F27D1/04F27D1/12F27B9/34F27B9/16F27B2009/3607C21B13/105Y02P10/134
Inventor 原田孝夫田中英年
Owner KOBE STEEL LTD
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