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Magnesia carbon brick

A magnesia-carbon brick and magnesia technology, applied in the field of magnesia-carbon bricks, can solve the problems of spalling resistance deterioration, sintering deepening, magnesia powder research and other problems

Active Publication Date: 2015-09-09
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 product was used for sample production. Weigh the raw materials according to the ratios described in Tables 1 and 2, and use a high-speed stirrer for mixing. The molding is performed by vacuum friction with a standard shape of the side wall with a length of 810mm at a molding pressure of up to 180MPa. Drying is maintained at a maximum of 280°C for 5 hours in a batch furnace.

[0047] [Table 1]

[0048]

[0049] [Table 2]

[0050]

[0051] A sample for physical property measurement was cut from the sample and tested. In the measurement of the appearance porosity, a sample with a shape of 60×60×60 mm was buried in the coke powder, heated in an electric furnace to 1400°C, kept for 3 hours, and then let cool naturally. After that, refined kerosene was used as a solvent for measurement in accordance with Japanese Industrial Standards JIS R 2205.

[0052] The corrosion resistance was evaluated by a rotating corrosion test. In the rotating cor...

Embodiment 13

[0059] Example 13 is an example of observing the effect of the addition of metallic Si, and it was confirmed that compared with Example 10, the effect of reducing the appearance porosity by adding a small amount.

Embodiment 14

[0060] Example 14 is an example in which a phenol resin with a high residual carbon ratio is applied, and the result that the appearance porosity is lower than that of Example 9 is obtained.

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PUM

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Abstract

Provided is a new high-durability magnesia carbon brick with further improved density (reduced porosity). This magnesia carbon brick comprises a magnesia raw material and graphite and includes 8-25 mass% of graphite and 75-92 mass% of magnesia raw material in the total amount of magnesia raw material and graphite. As the particle size composition of the magnesia raw material, this magnesia carbon brick includes 35 mass% or more of magnesia raw material with a particle size of 0.075-1 mm in the total amount of magnesia raw material and graphite, and the mass ratio of magnesia raw material with a particle size of 0.075-1 mm with respect to the magnesia raw material with a particle size of less than 0.075 mm is 4.2 or more. Further, this magnesia carbon brick has an apparent porosity of 7.8% or less after three hours of reduction firing at 1400°C.

Description

Technical field [0001] The invention relates to a magnesia-carbon brick, which is suitable for use as a lining material for an overall kiln, which carries out transportation, storage, refining and the like of molten metal. Background technique [0002] Magnesia-carbon bricks (hereinafter referred to as "MgO-C bricks") are bricks composed of magnesium oxide and graphite as main aggregates with excellent corrosion resistance and spalling resistance. They are widely used in the overall kiln represented by converters. Lining material. [0003] In recent years, as the work of refining vessels becomes more severe, MgO-C bricks with more excellent durability have been demanded. As an index showing the durability of the MgO-C brick, oxidation resistance and corrosion resistance can be cited. In order to improve these characteristics, an effective method is to densify the MgO-C brick, reduce the air permeability with the outside air, and suppress the penetration of slag or molten iron. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B2235/5436C04B2235/402C04B2235/5472C04B2235/6567C04B2235/425C04B2235/652C04B2235/5427C04B35/0435C04B2235/9692C04B2235/77C04B2235/428C04B2235/3205C04B2235/3821
Inventor 盐滨满晴田中雅人松尾贤典吉富丈记
Owner KROSAKI HARIMA CORP