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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 sintering deepening, magnesia micropowder research, spalling resistance deterioration, etc.

Active Publication Date: 2018-01-12
KROSAKI HARIMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above-mentioned Patent Document 1, the densification of MgO-C bricks by increasing the number of intermediate particles is the same as the purpose of the present invention, but in Patent Document 1, the amount of magnesium oxide fine powder is not studied, so when the When the amount of magnesium fine powder is large, the distance between magnesium oxide particles will be too close, and there will be problems such as deepening of sintering, increase of elastic modulus, and deterioration of spalling resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0046] The production line for the converter was used for the production of the sample. Weigh the raw materials according to the ratios described in Table 1 and 2, and use a high-speed agitator for mixing. The molding is performed with a side wall with a length of 810mm in a standard shape through 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.

[0047] [Table 1]

[0048] Table 1

[0049]

[0050] [Table 2]

[0051] Table 2

[0052]

[0053] Samples for physical property measurement were cut out from the samples and tested. In the measurement of appearance porosity, a sample with a shape of 60×60×60mm was buried in coke powder, heated to 1400°C in an electric furnace, kept for 3 hours, and then allowed to cool naturally. Thereafter, it was measured in accordance with Japanese Industrial Standard JIS R 2205 using refined kerosene as a solvent.

[0054] Corrosion resistance was evaluated by a rotar...

Embodiment 13

[0061] Example 13 is an example of observing the effect of adding metal Si, and it was confirmed that the effect of reducing the apparent porosity by adding a small amount of Si was confirmed compared with Example 10.

Embodiment 14

[0062] Example 14 is an example in which a phenolic resin with a high residual carbon ratio was applied, and the result was obtained that the apparent porosity was lower than that of Example 9.

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PUM

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Abstract

In the present invention, the attempt was made to increase the denseness (to lower the porosity) of a magnesia carbon brick furthermore thereby providing the magnesia carbon brick having a high durability never found in the past. The magnesia carbon brick of the present invention comprises a magnesia raw material and a graphite, wherein the magnesia carbon brick contains the graphite with the amount thereof in the range of 8% or more by mass and 25% or less by mass and the magnesia raw material with the amount thereof in the range of 75% or more by mass and 92% or less by mass, the both amounts being relative to the total amount of the magnesia raw material and the graphite; as a grain size distribution of the magnesia raw material, the magnesia raw material having particle diameter of in the range of 0.075 mm or more and 1 mm or less is blended with the amount thereof being 35% or more by mass relative to the total amount of the magnesia raw material and the graphite, and a mass ratio of the magnesia raw material having the particle diameter of in the range of 0.075 mm or more and 1 mm or less to the magnesia raw material having the particle diameter of less than 0.075 mm is 4.2 or more; and an apparent porosity thereof after firing in reducing atmosphere for 3 hours at 1400°C is 7.8% or less.

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, the effective method is to densify MgO-C bricks, reduce the air permeability with the outside air, and inhibit the penetration of slag or molten iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/043
CPCC04B35/0435C04B2235/402C04B2235/425C04B2235/428C04B2235/5427C04B2235/5436C04B2235/5472C04B2235/652C04B2235/6567C04B2235/77C04B2235/9692C04B2235/3205C04B2235/3821
Inventor 盐滨满晴田中雅人松尾贤典吉富丈记
Owner KROSAKI HARIMA CORP