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MgCa-SiC-C fireproof material and preparation method thereof

A technology of mgca-sic-c and refractory materials, which is applied in the field of refractory materials, can solve the problems of reduced service life, increased erosion rate, and increased erosion rate, and achieve the effects of increasing service life, improving slag resistance, and meeting smelting requirements

Inactive 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 The mullite network framework is formed by the reaction of the stone, and the combined use of metal aluminum powder and metal silicon powder can not only improve the oxidation resistance of the material, but also help to 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 in 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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  • MgCa-SiC-C fireproof material and preparation method thereof

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preparation example Construction

[0025] The preparation method based on the MgCa-SiC-C refractory provided by the invention comprises the following steps:

[0026] Step 1: Take fused or sintered magnesia-calcium sand or magnesia dolomite sand particles according to mass percentage: 50-70%, fused or sintered magnesia fine powder: 10-20%, silicon carbide: 5-17%, graphite: 5% ~15%, additives: 1~10%, plus anhydrous resin binder of 3~5% of the total mass of the aforementioned components for mixing to form the first intermediate product.

[0027] Wherein, the mixing is achieved by mixing with a high-speed mixer for 45 minutes.

[0028] Step 2: Carrying out shaping treatment on the first intermediate product to form the second intermediate product.

[0029] Among them, the forming process is realized by using a 1000t friction brick press or a 2000t hydraulic brick press.

[0030] Step 3: heat-treating the second intermediate product to obtain a MgCa-SiC-C refractory material.

[0031] Among them, the heat treatme...

Embodiment 1

[0033] See Table 1, mix ingredients according to Example 1, mix with a high-speed kneader for 45 minutes, shape with a 2000t hydraulic brick press, heat-treat at 160-300°C for 36 hours, and keep warm at 235°C for 5 hours , the obtained normal temperature compressive strength is greater than 35MPa, the apparent porosity is less than 10%, and the bulk density is greater than 2.75g / cm 3 The MgCa-SiC-C refractory shaped product provided by the present invention.

Embodiment 2

[0035] See Table 1, mix the ingredients according to Example 2, mix them in a high-speed kneader for 45 minutes, shape them with a 1000t friction brick press, heat them at a maximum temperature of 235°C for 5 hours and heat them for 36 hours under the condition of heat preservation to obtain the normal temperature compressive strength Greater than 35MPa, apparent porosity less than 8%, bulk density greater than 2.80g / cm 3 A MgCa-SiC-C refractory shaped product.

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Abstract

The invention discloses an MgCa-SiC-C fireproof material, belonging to the technical field of fireproof materials. The MgCa-SiC-C fireproof material comprises the following components by mass: 50-70% of electrically molten or sintered magnesium-calcium sand or magnesium-domolite sand granule, 10-20% of electrically molten or sintered magnesium sand fine powder, 5-17% of silicon carbonate, 5-15% of graphite, 1-10% of additive, and anhydrous resin bonder accounting for 3-5% of total mass percent of the electrically molten or sintered magnesium-calcium sand or magnesium-domolite sand granule, the electrically molten or sintered magnesium sand fine powder, the silicon carbonate, the graphite and the additive. The invention further discloses a preparation method of the MgCa-SiC-C fireproof material. The MgCa-SiC-C fireproof material can be applied to a high-temperature steel and iron metallurgy container, especially as an inner lining of a hot metal ladle for iron making, and can meet smelting requirements of the preprocessed hot metal ladle.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a MgCa-SiC-C 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 composite materials. Many, to meet the needs of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 祝少军崔园园曹勇付中锋唐永祥
Owner SHOUGANG CORPORATION
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