Low-carbon magnesia carbon bricks and preparation method thereof

A technology of carbon-magnesia-carbon bricks and fused magnesia, applied in the field of magnesia-carbon bricks, can solve the problems of difficult dispersion of carbon black and composite graphitized carbon black, low degree of industrial production, high viscosity of phenolic resin, etc., and achieve excellent heat resistance Excellent shock resistance and oxidation resistance, thermal shock resistance and oxidation resistance, and the effect of improving thermal shock resistance

Inactive Publication Date: 2012-07-18
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The preparation of low-carbon magnesia-carbon bricks by the above methods is based on the modification of the binder and combined with nanotechnology to improve the performance of the material, but the preparation cost is high, and the viscosity of the phenolic resin is relatively high, and the carbon black and composite graphitized carbon black Dispersion is difficult, so the degree of industrial production is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A low-carbon magnesia-carbon brick and its preparation method: first use 57~64wt% fused magnesia particles, 24~32wt% fused magnesia fine powder, 2~4wt% flake graphite, 5~12wt% Additives and 2-4wt% antioxidant are used as raw materials, mixed evenly, and 2-4wt% phenolic resin is added to the raw materials for kneading, and then pressed and dried to obtain low-carbon magnesia-carbon bricks.

[0019] In this embodiment: the pressure of compression molding is 120~180MPa; Antioxidant is Al powder; 0.088mm is 15~16wt%.

[0020] The apparent porosity of the low-carbon magnesia-carbon bricks obtained in this example after drying is 7.8%~8.5%, and the bulk density is 3.01~3.03g / cm 3 , compressive strength 47.0~51.5MPa:, corrosion layer thickness: 4.3~4.9mm, thermal expansion coefficient at 1400 ° C: 7.7~8.1×10 -6 / °C.

Embodiment 2

[0022] A low-carbon magnesia-carbon brick and its preparation method: first, 62~68wt% of fused magnesia particles, 23~29wt% of fused magnesia fine powder, 1~3wt% of flake graphite, 4~9wt% of Additives and 1-2wt% antioxidant are used as raw materials, mixed evenly, and 3-5wt% phenolic resin is added to the raw materials for kneading, and then pressed and dried to obtain low-carbon magnesia-carbon bricks.

[0023] In this embodiment: the compression molding pressure is 170~220MPa; the antioxidant is a mixture of Al powder and Si powder; the gradation of fused magnesia particles is: 25~28wt% for 3~2mm, 21~ 23wt%, 1~0.088mm is 16~17wt%.

[0024] The apparent porosity of the low-carbon magnesia-carbon bricks obtained in this example after drying is 7.0%~7.5%, and the bulk density is 3.02~3.05g / cm 3 , compressive strength: 52.0~58.5MPa, erosion layer thickness: 3.5~4.0mm, thermal expansion coefficient at 1400°C: 6.8~7.2×10 -6 / °C.

Embodiment 3

[0026] A low-carbon magnesia-carbon brick and its preparation method: first, 65-70wt% fused magnesia particles, 19-24wt% fused magnesia fine powder, 4-6wt% flake graphite, 3-7wt% Additives and 1-2wt% antioxidant are used as raw materials, mixed evenly, and 3-5wt% phenolic resin is added to the raw materials for kneading, and then pressed and dried to obtain low-carbon magnesia-carbon bricks.

[0027] In the present embodiment: the pressure of compression molding is 200~260MPa; Antioxidant is Si powder; 0.088mm is 16~17wt%.

[0028] The apparent porosity of the low-carbon magnesia-carbon bricks obtained in this example after drying is 6.5%~6.9%, and the bulk density is 3.05~3.07g / cm 3 , compressive strength: 60.5~68.0MPa, erosion layer thickness: 2.9~3.3mm, thermal expansion coefficient at 1400°C: 6.5~6.9×10 -6 / °C.

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Abstract

The invention relates to low-carbon magnesia carbon bricks and a preparation method thereof. According to the technical scheme, the method for preparing the low-carbon magnesia carbon bricks comprises the following steps of: uniformly mixing 57 to 75 weight percent of fused magnesite granules, 18 to 32 weight percent of fused magnesite fine powder, 1 to 6 weight percent of crystalline flake graphite, 1 to 12 weight percent of additive and 1 to 4 weight percent of antioxidant which serve as raw materials, adding a phenolic resin in an amount which is 2 to 6 percent of the weight of the raw materials for mixing, compressing for forming, and drying to obtain the low-carbon magnesia carbon bricks. A method for preparing the additive comprises the following steps of: mixing and milling 20 to 78 weight percent of steelmaking wastes and 22 to 80 weight percent of aluminum-containing compound for 30 to 120 minutes by using a ball-milling machine, compressing the mixed and milled materials for forming, keeping the temperature of between 1,300 and 1,700 DEG C for 2 to 5 hours, cooling and taking out to obtain the additive. The method has the characteristics of low production cost, simple process and high industrialized degree; and the low-carbon magnesia carbon bricks produced by the method are low in coefficient of thermal expansion and high in thermal shock resistance and oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of magnesia-carbon bricks, and in particular relates to a low-carbon magnesia-carbon brick and a preparation method thereof. Background technique [0002] Magnesia-carbon bricks, which emerged in the 1970s, are widely used in the steelmaking industry due to their good thermal shock resistance and corrosion resistance. However, due to the high carbon content and high thermal conductivity of traditional magnesia carbon bricks, it leads to high energy consumption. At the same time, it will cause problems such as carburization of molten steel and consumption of a large amount of valuable non-renewable graphite resources in the VOD refining ladle. With the vigorous development of the refining process outside the furnace, the output of low-carbon steel and ultra-low-carbon steel is getting higher and higher, so the low-carbonization of magnesia-carbon bricks has become one of the research hotspots in the field of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 顾华志赵继增武建芳余西平黄奥刘丽
Owner WUHAN UNIV OF SCI & TECH
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