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Magnesium-zirconium brick with high erosion resistance and thermal shock resistance for RH furnace and production technology thereof

A production process and erosive technology, applied in the field of inorganic non-metallic materials, can solve the problems of poor thermal shock resistance, large thermal expansion coefficient and high furnace shell temperature, and achieve long service life, high direct bonding rate and significant economic benefits. Effect

Inactive Publication Date: 2011-08-10
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high thermal conductivity of magnesia spinel bricks, the temperature of the furnace shell is too high, and the thermal expansion coefficient is large, and the thermal shock resistance is poor. The current use effect cannot be compared with magnesia-chrome bricks at all.

Method used

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  • Magnesium-zirconium brick with high erosion resistance and thermal shock resistance for RH furnace and production technology thereof
  • Magnesium-zirconium brick with high erosion resistance and thermal shock resistance for RH furnace and production technology thereof
  • Magnesium-zirconium brick with high erosion resistance and thermal shock resistance for RH furnace and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use 40wt% of 98 fused magnesia with a particle size of 5-3mm, 18wt% of fused magnesia-zircon sand with a particle size of 3-1mm, 8wt% of fused magnesia-zircon sand with a particle size of 1-0mm, and fused fused magnesia with a particle size of 2 o 3 Magnesia fine powder 2wt%. Add the above raw materials into large granules first, then add 1.6wt% of the adjusted binder, then add fine granules, fine powder, and micropowder in turn, and wet mill for 15 minutes. Using hydraulic pressure of 300MPa, keep forming for 60s. After natural drying for 48 hours, push it into a drying kiln at 120°C for 48 hours. Fire at 1760°C for 5 hours.

[0027] The main crystal phase of the finished magnesium-zirconium brick is periclase, magnesium-zirconium eutectic, and magnesium-zirconium solid solution. The main chemical components are: MgO content 84.8wt%, ZrO 2 Content 11.1wt%, CaO content 0.87wt%, Y 2 o 3 Content 0.85wt%, SiO 2 Content 0.83wt%, Fe 2 o 3 Content 0.58wt%, Al 2 o 3 ...

Embodiment 2

[0032] Use 35wt% of 98 fused magnesia sand with a particle size of 5-3mm, 20wt% of fused magnesia-zircon sand with a particle size of 3-1mm, 8wt% of fused magnesia-zircon sand with a particle size of 1-0mm, and fused fused magnesia with a particle size of 2 o 3 Magnesia fine powder 1wt%. Add the above raw materials into large granules first, then add 1.8wt% of the adjusted binder, then add fine granules, fine powder, and micropowder in turn, and wet mill for 15 minutes. Using hydraulic pressure of 300MPa, keep forming for 60s. After natural drying for 24 hours, push it into a drying kiln at 120°C for 24 hours. Fire at 1750°C for 5 hours.

[0033] The main crystal phase of the finished magnesium-zirconium brick is periclase, magnesium-zirconium eutectic, magnesium-zirconium solid solution, and the main chemical components are: MgO content 86.2wt%, ZrO 2 Content 9.80wt%, CaO content 0.97wt%, Y2 o 3 Content 0.58wt%, SiO 2 Content 0.57wt%, Fe 2 o 3 Content 0.55wt%, Al 2 o ...

Embodiment 3

[0037] Use 30wt% of 98 fused magnesia sand with a particle size of 5-3mm, 30wt% of fused magnesia-zircon sand with a particle size of 3-1mm, 10wt% of fused magnesia-zircon sand with a particle size of 1-0mm, and fused fused magnesia with a particle size of 2 o 3 Magnesia fine powder 1.5wt%. Add the above raw materials into large granules first, then add 2.0wt% of the adjusted binder, then add fine granules, fine powder, and micropowder in turn, and wet mill for 12 minutes. The friction brick press is pressed into shape. After natural drying for 24 hours, push it into a drying kiln at 120°C for 48 hours. Fire at 1730°C for 4 hours.

[0038] The main crystal phase of the finished magnesium-zirconium brick is periclase, magnesium-zirconium eutectic, magnesium-zirconium solid solution, and the main chemical components are: MgO content 83.8wt%, ZrO 2 Content 12.60wt%, CaO content 1.67wt%, Al 2 o 3 Content 0.63wt%, Y 2 o 3 Content 0.65wt%, SiO 2 Content 0.57wt%, Fe 2 o 3 C...

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Abstract

The invention relates to a magnesium-zirconium brick with high erosion resistance and thermal shock resistance for an RH furnace and a production technology thereof. The brick comprises the following components by weight percent: 76-90% of MgO and 5-21% of ZrO2; and the firing temperature of the brick is 1680-1840 DEG C. The production technology comprises the following steps: pretreating magnesia and zirconia, synthesizing the magnesia and zirconia into magnesium-zirconium sand; crushing synthesized magnesium-zirconium sand and fused magnesia to 5-3mm, 3-1mm and 1-0mm particles; homogenizing under strong force and mixing the granular materials, 150-200 mesh magnesia and magnesium-zirconium sand powder, 200-250 mesh zirconia powder, additives CaO and Y2O3 and binder paper pulp water liquid and performing compression moulding; baking at 120 DEG C for 24-72 hours; and heating to 1680-1840 DEG C and maintaining the temperature for 3-5 hours. The linear change of the finished brick is within the range of + / -0.5%; and after being baked, the brick has no surface chap defect caused by the phase change of zirconia and has excellent refinery cinder erosion resistance and thermal shock resistance.

Description

technical field [0001] The invention relates to a process for preparing magnesia-zirconium bricks for RH furnaces with high corrosion resistance and high thermal shock resistance, belonging to the technical field of inorganic non-metallic materials. The magnesia-zirconium brick has excellent properties such as high corrosion resistance, high thermal shock resistance, high wear resistance, and high creep resistance, and is suitable for the lower, middle, and upper parts of the RH vacuum degassing device, as well as the dipping tube of the RH furnace And other severely eroded parts, instead of magnesia-chromium refractory materials that are harmful to the environment, become environmentally friendly refractory materials for refining furnaces. Background technique [0002] RH vacuum treatment technology is a multifunctional secondary refining method with advanced technology and effective improvement of molten steel quality. RH vacuum treatment requires that the refractory mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 陈松林袁林陈雪峰刘锡俊曾鲁举王俊涛翟耀杰吴兴胜
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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