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Composite fireproof material and preparation method thereof

A technology of refractory materials and binders, applied in the field of refractory materials, can solve the problems of reduced service life, increased erosion rate, increased erosion rate, etc., and achieves the effects of improving service life, improving slag resistance, and meeting smelting requirements.

Active Publication Date: 2012-12-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patent US 6464932 discloses a non-burning carbon-containing refractory material. The alumina-silicon carbide-carbon non-burning refractory material can be applied to molten iron loading containers such as torpedo tanks. If this refractory material is used in KR pretreatment desulfurization molten iron package, affected by the desulfurizer, its erosion rate will increase and its service life will decrease
Chinese patent 200710040413.2 discloses an alumina-based andalusite-SiC-C brick, its manufacturing method and its application. Two types of andalusite are introduced into the components of this brick, and secondary mo Mullite reacts to form a mullite network framework. The combined use of metal aluminum powder and metal silicon powder can not only improve the oxidation resistance of the material, but also help improve the physical properties of the material at medium and high temperatures. This brick is used for 300 tons The service life of the molten iron ladle is increased to 700-800 furnaces, and the abnormal structural spalling is reduced, the melting loss of the impact zone is reduced, and the expansion of cracks on the cladding wall is suppressed. However, when the molten iron ladle adopts the KR molten iron pretreatment process, the brick erosion rate is limited rising trend

Method used

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  • Composite fireproof material and preparation method thereof

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preparation example Construction

[0031] The preparation method based on the composite refractory material provided by the invention comprises the following steps:

[0032] Step 1: Take fused or sintered magnesia-aluminum spinel according to mass percentage: 60-75%, silicon carbide: 5-17%, graphite: 5-15%, additive: 1-10%, plus the total amount of the above-mentioned components 3-5% resin binder by mass is mixed to form the first intermediate product;

[0033] Wherein, the mixing is achieved by mixing with a high-speed mixer for 45 minutes.

[0034] Step 2: forming the first intermediate product to form the second intermediate product;

[0035] Among them, the forming process is realized by using a 1000t friction brick press.

[0036] Step 3: heat-treating the second intermediate product to obtain a composite refractory material.

[0037] Wherein, the heat treatment takes 36 hours, and at the same time, the temperature is kept at a maximum temperature of 240° C. for 5 hours.

Embodiment 1

[0039] Referring to Table 1, the ingredients were prepared according to Example 1. After being mixed by a high-speed kneader for 45 minutes, it was formed by a 1000t friction brick press, and heat-treated for 36 hours at a maximum temperature of 240°C for 5 hours. 35MPa, the apparent porosity is less than or equal to 10%, and the bulk density is greater than 2.75g / cm 3 The composite refractory shaped product provided by the present invention.

Embodiment 2

[0041] Referring to Table 1, the ingredients were prepared according to Example 2. After being mixed by a high-speed kneader for 45 minutes, it was formed by a 1000t friction brick press, and heat-treated for 36 hours at a maximum temperature of 240°C for 5 hours. 35MPa, the apparent porosity is less than or equal to 10%, and the bulk density is greater than 2.75g / cm 3 The composite refractory shaped product provided by the present invention.

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Abstract

The invention discloses a composite fireproof material, and belongs to the technical field of fireproof material. The composite fireproof material includes the following components in percentage by mass: 60 to 75% of electric-molten and / or sintering magnalium spinel, 5 to 17% of carborundum, 5 to 15% of graphite, 1 to 10% of additive, and 3 to 5% of resin binder which is 3 to 5% of the total mass of all the mentioned components above. The invention further discloses a preparation method of the composite fireproof material. The magnalium spinel is introduced as the main component of the composite fireproof material, thus forming a magnalium spinel-carborundum-carbon fireproof material; compared with alumina, the magnalium spinel reduces the reactivity of CaO in the desulfurizined slag, therefore, the slag resistance of the material is improved, the erosion rate is reduced, and the benefit is brought for prolonging the service life of the pre-desulfurizing hot metal ladle. The composite fireproof material can be applied to a ferrous metallurgy high-temperature container, and particularly serves as the lining of the hot metal ladle for iron-making; and the requirement on smelting the pre-processing hot metal ladle can be met.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium aluminum spinel-silicon carbide-carbon composite refractory material and a preparation method thereof. Background technique [0002] Carbon-containing composite refractories can be widely used in the iron and steel industry. It is usually made of oxide refractory materials such as magnesia, bauxite, corundum, magnesia-aluminum spinel, non-oxide refractory materials such as graphite and carbon black, and aluminum powder. , silicon powder and other additives, using tar or resin as a binder, prepared through mixing, pressing and heat treatment. Chinese patent 200610019533.7 discloses a periclase-silicon carbide-carbon composite material and its preparation method. This composite material can be used as the lining of metallurgical furnaces and containers, and at the same time, the carburization behavior of molten steel is much lower than that of traditional c...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 崔园园祝少军曹勇钟凯
Owner SHOUGANG CORPORATION
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