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Magnesia-carbon brick

A technology of magnesia-carbon bricks and magnesia, applied in the field of magnesia-carbon bricks, can solve problems such as deterioration of spallation resistance, inability to improve compactness, and damage to filling properties

Inactive Publication Date: 2015-08-26
KROSAKI HARIMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Densification by increasing the number of intermediate particles is the same as the starting point of the present invention. However, if the amount of fine powder cannot be limited to a small amount at this time, the filling property will be impaired, the densification will not be improved, and the spalling resistance will also deteriorate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0056] The production line for the converter was used for the production of the sample. The raw materials are weighed according to the ratios recorded in Tables 1-3, and a high-speed mixer is used for kneading. The molding is performed according to the standard shape of the side wall with a length of 810mm, using vacuum friction and a molding pressure of up to 180MPa. Drying was in a batch oven at a maximum of 280°C for 5 hours.

[0057] [Table 1]

[0058]

[0059] [Table 2]

[0060]

[0061] [table 3]

[0062]

[0063] Samples for measuring physical properties were cut out from the prepared samples, and the apparent porosity was measured, and the oxidation resistance and corrosion resistance were evaluated.

[0064] A sample having a shape of 60×60×60 mm was used for the measurement of the apparent porosity. The measurement of the apparent porosity was carried out after 3 hours of heat treatment in a reducing environment at 1400°C. When the heat treatment tem...

Embodiment 1

[0068] In Example 1, 0.13% by mass of metal Al with a particle size of 75 μm or less was added to 13% by mass of graphite, and the ratio of the amount of metal Al to graphite added was 1.0%, so that the apparent porosity reached 7.8%, and the oxidation resistance and resistance Excellent results in corrosion resistance. On the other hand, in Comparative Example 1, the addition amount of metal Al was small, that is, the ratio of the addition amount of metal Al to graphite was small, so the apparent porosity increased, resulting in poor oxidation resistance and corrosion resistance.

Embodiment 2

[0069] In Example 2, 1.9% by mass of metal Al having a particle size of 75 μm or less was added to 13% by mass of graphite, and the ratio of metal Al to graphite was 14.6%, so the apparent porosity decreased and the oxidation resistance improved. On the other hand, in Comparative Example 2, since the addition amount of metal Al was too large relative to the addition amount of graphite, the apparent porosity increased despite the improvement in oxidation resistance.

[0070] Examples 3 and 4 are evaluated on the basis of Examples 1 and 2 by adjusting the mass ratio of the magnesia raw material with a particle size of 0.075 mm to 1 mm to the magnesia raw material with a particle size of less than 0.075 mm to 5.38, which is 4.2 or more the result of. Compared with the cases of Examples 1 and 2, the results that the apparent porosity and corrosion resistance were improved were obtained.

[0071] Tables 2 and 3 show the results of investigation of the effects of the type and amoun...

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Abstract

The present invention improves the density (reduces the porosity) of one layer in a magnesia-carbon brick and provides a magnesia-carbon brick having higher durability than ever before. The magnesia-carbon brick according to the present invention comprises a magnesia raw material and graphite, wherein the graphite is contained in an amount of 3 to 25 mass% inclusive relative to the total amount of the magnesia raw material and the graphite, the magnesia raw material is contained in an amount of 75 to 97 mass% inclusive relative to the total amount of the magnesia raw material and the graphite, and the apparent porosity of the magnesia-carbon brick is 7.8% or less after the magnesia-carbon brick is subjected to reduced firing at 1400˚C for 3 hours.

Description

technical field [0001] The present invention relates to a magnesia-carbon brick, which is suitable for being used as the lining material of the whole kiln for carrying, storing, refining and the like of molten metal. Background technique [0002] Magnesia carbon brick (hereinafter referred to as "MgO-C brick") is a brick with excellent corrosion resistance and spallation resistance composed of magnesia and graphite as the main aggregate, and is widely used in the overall kiln represented by the converter. Furnace lining material. [0003] In recent years, MgO—C bricks more excellent in durability have been demanded as the work of refining vessels has become more severe. As an index showing the durability of this MgO—C brick, oxidation resistance and corrosion resistance are mentioned. In order to improve these characteristics, it is effective to densify MgO-C bricks to reduce the air permeability with the outside air, and to suppress the penetration of slag or molten iron....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B2235/5436C04B2235/402C04B2235/3821C04B35/013C04B2235/5472C04B2235/425C04B2235/652C04B2235/5427C04B35/0435C04B2235/77C04B2235/428C04B35/043C04B2235/3206
Inventor 田中雅人盐滨满晴松尾贤典吉富丈记
Owner KROSAKI HARIMA CORP