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Low carbon magnesia-carbon brick containing metal iron

A carbon magnesia carbon brick and metal iron technology, applied in the field of refractory materials, can solve the problems of affecting the purity of molten steel, affecting the quality of special steel, and low life, and achieving the effect of maintaining thermal shock resistance.

Inactive Publication Date: 2009-05-06
江苏苏嘉集团新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the smelting of low-carbon steel such as stainless steel and other special steel, if magnesia-carbon bricks are used, the carbon component will easily dissolve into molten steel during the smelting process, affecting the purity of molten steel and thus affecting the quality of special steel.
If the proportion of carbon in magnesia-carbon bricks is reduced, the thermal expansion rate of magnesia-carbon bricks will increase, thermal shock resistance will deteriorate, easy to peel off, and the service life will be low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0016] Contains 94% magnesia (grain size greater than 0, less than or equal to 5mm), graphite 2.5%, iron powder (particle size ≤ 0.02mm, metal iron content ≥ 98%) 1%, phenolic resin liquid 2.5%. Plus 2% aluminum powder. Implementation method: The part of the magnesia whose particle size is less than 0.088 mm is pre-mixed with metal iron powder and aluminum powder to obtain premix A. Add magnesia particles and phenolic resin solution to the mixer and mix for 2 minutes, add graphite and mix for 5 minutes, add premix A, mix for 15 minutes, and discharge to obtain the mixture. Put the mixture into the mold of the press and press to form it. The shaped bricks are baked in a kiln to 200°C. The product is obtained after leaving the kiln. This product is used in the slag line of the steel drum, and has the characteristics of good slag resistance and not easy to peel off.

Embodiment 3

[0017] Embodiment three, containing 89.95% of magnesia (grain size greater than 0, less than or equal to 5mm), carbon black 1%, iron powder (≤0.074mm, metallic iron content ≥97%) 4%, phenolic resin liquid 3.5%, asphalt powder 1.5% %, boron carbide (0.02mm) 0.05%. Implementation method: Premix A is obtained by premixing the part of the magnesia whose particle size is less than 0.088 mm with metal iron powder, asphalt powder, carbon black, and boron carbide. Add magnesia particles and phenolic resin liquid into the mixer and mix for 3 minutes, add premix A, mix for 15 minutes, and discharge to obtain the mixture. Put the mixture into the mold of the press and press to form it. The shaped bricks are baked in a kiln to 200°C. The product is obtained after leaving the kiln. The high-temperature flexural strength of this product can reach 14Mpa under the condition of 1400℃ buried carbon. Compared with the one without iron powder: the thermal expansion from room temperature to 16...

Embodiment 4

[0018] Embodiment 4 contains 89% of magnesia (grain size greater than 0 and less than or equal to 5mm), 4% of graphite (800 mesh), 3% of iron powder (≤0.074mm), 4% of pitch, and 5% of antioxidant. Embodiment: Premix A is obtained by premixing the part of the magnesia whose particle size is less than 0.088 mm with metal iron powder and antioxidant. Heat the magnesia particles to 200°C and put them into the mixer, heat and liquefy the asphalt to 130°C and put them into the mixer and stir together for 2 minutes, add graphite and mix for 3 minutes, add premix A, mix for 10 minutes, and discharge to get the mixture . Put the mixture into the mold of the press while it is hot, and press to form it. The formed bricks are cooled to obtain the product. This product is used at the bottom of the ladle of the steel drum. It has the characteristics of good resistance to the impact of molten steel and is not easy to peel off. It can be used 100 times.

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Abstract

The invention discloses a low carbon magnesia-carbon brick containing metallic iron, which belongs to a refractory material. According to the design proposal provided by the invention, the material contains 1 to 8 percent of metallic iron, and the balance being 83 to 94 percent of magnesia; 1 to 6 percent of carbon element, the material is bonded by 2.5 to 5 percent of carbon-containing bonding agent; and a small amount of antioxidant can also be externally added. Compared with an ordinary magnesia-carbon brick, the performance of the low carbon magnesia-carbon brick has the characteristics of less carburization to molten steel and difficult pollution to ultra-low-carbon steel. The magnesia is a main component which ensures that the magnesia-carbon brick has good slag corrosion resistance. The carbon element is one of the main components, which ensures that the magnesia-carbon brick has good slag penetration resistance and good thermal shock performance. The adding of the metallic iron improves the thermal conductivity of the low carbon magnesia-carbon brick; and the metallic iron produces a liquid phase at high temperature for reducing internal stress, thereby improving the thermal shock resistance of the low carbon magnesia-carbon brick.

Description

technical field [0001] The invention belongs to a refractory material; in particular, it is a low-carbon magnesia-carbon brick containing metal iron. Background technique [0002] The melting point of magnesium oxide is 2800°C, which has strong high temperature resistance, but its thermal shock resistance and slag resistance are poor; carbon materials represented by graphite also have strong high temperature resistance, and their thermal expansion coefficient is low , The thermal shock resistance is very excellent, and it is not easy to infiltrate with molten steel and steel slag at high temperature. The two are compounded in a certain proportion to form a refractory material with good comprehensive performance - magnesia carbon brick. Magnesia carbon bricks are mainly used in steelmaking refractories, such as converters, steelmaking electric furnaces, and ladles. my country's existing magnesia carbon bricks generally have a carbon content > 10%, and my country's metallu...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 张雪松俞晓东朱光永
Owner 江苏苏嘉集团新材料有限公司
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