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Graphite core for nickel iron electric furnace door

A graphite core and electric furnace technology, which is applied in the field of smelting equipment, can solve the problems of easy breakage of electric furnace doors, easy slag iron, poor thermal shock resistance, etc., and achieves good anti-quick cooling and rapid heating effect, convenient construction and replacement, and improved service life. Effect

Inactive Publication Date: 2012-09-19
HENAN FANGYUAN CARBON GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nickel-iron electric furnace door bricks are commonly made of aluminum silicate materials (such as high alumina bricks, composite brown corundum, corundum mullite bricks) and carbon bricks. Due to poor thermal shock resistance of aluminum silicate materials, they are easy to peel off. Moreover, the slag resistance is not good, slag iron is easy to stick, and the oxidation resistance of carbon bricks is not good. Therefore, these bricks cause the door of the electric furnace to be easily damaged, and the furnace is often shut down for maintenance, and it is very inconvenient to repair once. The material of the part is time-consuming and labor-intensive and affects production

Method used

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Examples

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Effect test

Embodiment 1

[0009] Example 1: A graphite core for a nickel-iron electric furnace door, prepared from the following raw materials in parts by weight: 55-65 parts of needle-shaped petroleum coke, 6-8 parts of pitch coke, 0.5 part of iron oxide powder, medium-temperature coal tar pitch 26-30 servings.

[0010] The preparation process is as follows: the above raw materials are mixed in proportion, after fine grinding and hot kneading, tableting and granulation are carried out to improve the density and uniformity of the paste, and then crushed into the particle size required by the process, vacuum-molded with a large hydraulic press, and then After high-temperature roasting and vacuum impregnation, the whole process requires three dipping and four roasting to increase the density and strength of the material, and finally graphitization to improve the thermal conductivity and thermal stability of the material.

[0011] The high thermal conductivity graphite core is built in the center of the m...

Embodiment 2

[0012] Embodiment 2: A graphite core for a nickel-iron electric furnace door is prepared from the following raw materials in parts by weight: 48-53 parts of 0.075mm needle-shaped petroleum coke, 7-12 parts of 0.045mm needle-shaped petroleum coke, and 0.075mm pitch 6-8 parts of coke, 0.5 parts of iron oxide powder, 26-30 parts of medium temperature coal tar pitch.

[0013] Others are the same as embodiment 1.

Embodiment 3

[0014] Embodiment 3: a graphite core for a nickel-iron electric furnace door, prepared from the following raw materials in parts by weight: 48 parts of 0.075mm needle-shaped petroleum coke, 12 parts of 0.045mm needle-shaped petroleum coke, 6 parts of 0.075mm pitch coke, 0.5 parts of iron oxide powder, 26 parts of medium temperature coal tar pitch.

[0015] Others are the same as embodiment 1.

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PUM

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Abstract

The invention relates to a graphite core for a nickel iron electric furnace door, which is prepared from the raw materials in parts by weight: 55-65 parts of acicular petroleum coke, 6-8 parts of pitch coke, 0.5 part of iron oxide powder and 26-30 parts of moderate temperature coal pitch. The invention has the advantages of compact structure, smooth surface, no adhesion to slag iron, high strength, high heat conductivity coefficient (up to 200w / m.k), excellent thermal conductivity and favorable thermal shock resistance; and when being used at the central tapping position of the nickel iron electric furnace door, the furnace door graphite core relieves the damage of thermal stress on door bricks, prolongs the service life of the door bricks, is convenient for construction and replacement, and enhances the overall service life of the nickel iron electric furnace.

Description

technical field [0001] The invention belongs to the technical field of smelting equipment, in particular to a nickel-iron electric furnace door brick. Background technique [0002] Nickel-iron electric furnace door bricks are commonly made of aluminum silicate materials (such as high alumina bricks, composite brown corundum, corundum mullite bricks) and carbon bricks. Due to poor thermal shock resistance of aluminum silicate materials, they are easy to peel off. Moreover, the slag resistance is not good, slag iron is easy to stick, and the oxidation resistance of carbon bricks is not good. Therefore, these bricks cause the door of the electric furnace to be easily damaged, and the furnace is often shut down for maintenance, and it is very inconvenient to repair once. The material of the part is time-consuming and labor-intensive and affects production. Contents of the invention [0003] What the present invention aims to solve is the thermal shock resistance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66F27D1/18
Inventor 李健伟石欣李伟宋留建徐松山
Owner HENAN FANGYUAN CARBON GRP
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