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Magnesium-zirconium spinel ramming material for furnace bottom

A technology of zirconium spinel and magnesium aluminum spinel, which is applied in the field of zirconium spinel furnace bottom ramming materials, can solve the problems of low shrinkage, furnace lining settlement, and steel wear, and achieve low linear shrinkage and excellent Good performance in high temperature use and corrosion resistance of molten steel

Active Publication Date: 2014-10-22
LIAONING ZHONGMEI HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, domestic iron and steel enterprises have more than 10,000 times of converter steelmaking furnace life, and the problem of steel infiltration in the triangle area of ​​the converter bottom affecting the furnace life is also reflected. Since the joint between the converter lining and the spherical furnace bottom is mostly filled with ordinary magnesia, in Cavities appear during use, which can also cause the overall subsidence of the furnace lining; with the erosion and erosion of molten steel during use, the triangular area where the spherical furnace bottom and the furnace lining are combined is gradually corroded, and to a certain extent, molten steel seeps in from the joint, greatly It will affect the life of the furnace and cause the risk of steel wear. Therefore, it is urgent for those skilled in the art to provide a new type of ramming material that has bonding strength at low temperature, low shrinkage at high temperature, low porosity, and certain protection for the furnace shell. technical problems

Method used

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  • Magnesium-zirconium spinel ramming material for furnace bottom
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  • Magnesium-zirconium spinel ramming material for furnace bottom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 A kind of magnesium-zirconium spinel furnace bottom ramming material

[0017] The raw materials adopted are formulated according to the following parts by weight:

[0018]

[0019]

[0020] High-grade magnesia is aggregate magnesium content greater than or equal to 97%, particle size ≤ 5 mesh, magnesia-alumina spinel particle size ≤ 4 mesh, zirconia particle size ≤ 800 mesh, the above-mentioned high-grade magnesia, magnesia-alumina spinel, oxide Zirconium and high-temperature asphalt are mixed and stirred evenly in proportion to obtain the finished product.

[0021] The ramming material is mixed with an appropriate amount of water to make a billet, and the compressive strength and permanent linear change rate test after burning are carried out. The results are shown in Table 1. As can be seen from Table 1, the ramming material has very high bonding strength. After calcination at a temperature of not less than 1200°C for 3 hours, the compressive stren...

Embodiment 2

[0022] Embodiment 2 A kind of magnesium-zirconium spinel furnace bottom ramming material

[0023] The raw materials adopted are formulated according to the following parts by weight:

[0024]

[0025] High-grade magnesia is aggregate magnesium content greater than or equal to 97%, particle size ≤ 5 mesh, magnesia-alumina spinel particle size ≤ 4 mesh, zirconia particle size ≤ 800 mesh, the above-mentioned high-grade magnesia, magnesia-alumina spinel, oxide Zirconium and sodium tripolyphosphate are mixed and stirred evenly in proportion to obtain a finished product.

[0026] The ramming material is mixed with an appropriate amount of water to make a billet, and the compressive strength and permanent linear change rate test after burning are carried out. The results are shown in Table 1. As can be seen from Table 1, the ramming material has very high bonding strength. After being calcined at a temperature not less than 1200°C for 3 hours, the compressive strength can still r...

Embodiment 3

[0027] Embodiment 3 A kind of magnesium-zirconium spinel furnace bottom ramming material

[0028] The raw materials adopted are formulated according to the following parts by weight:

[0029]

[0030] High-grade magnesia is aggregate magnesium content greater than or equal to 97%, particle size ≤ 5 mesh, magnesia-alumina spinel particle size ≤ 4 mesh, zirconia particle size ≤ 800 mesh, the above-mentioned high-grade magnesia, magnesia-alumina spinel, oxide Zirconium, sodium hexametaphosphate and uropintor are mixed and stirred evenly in proportion to obtain a finished product.

[0031] The ramming material is mixed with an appropriate amount of water to make a billet, and the compressive strength and permanent linear change rate test after burning are carried out. The results are shown in Table 1. As can be seen from Table 1, the ramming material has very high bonding strength. After being calcined at a temperature of not less than 1200°C for 3 hours, the compressive stren...

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Abstract

The invention discloses a magnesium-zirconium spinel ramming material for a furnace bottom. The ramming material is prepared from the following raw materials in parts by weight: 50-80 parts of high-grade magnesia, 10-35 parts of magnesium aluminate spinel, 2-8 parts of zirconium oxide and 7-15 parts of carbon-contained binding agent. The ramming material can be used for improving the filling condition of a triangle area part at the furnace bottom and providing a certain protection for a furnace shell in a high-temperature state, so that the furnace life is prolonged, and the working safety is favorably realized.

Description

technical field [0001] The invention relates to a zirconium spinel furnace bottom ramming material for a steelmaking converter, in particular to a magnesium-zirconium spinel furnace bottom ramming material. Background technique [0002] At present, domestic iron and steel enterprises have more than 10,000 times of converter steelmaking furnace life, and the problem of steel infiltration in the triangle area of ​​the converter bottom affecting the furnace life is also reflected. Since the joint between the converter lining and the spherical furnace bottom is mostly filled with ordinary magnesia, in Cavities appear during use, which can also cause the overall subsidence of the furnace lining; with the erosion and erosion of molten steel during use, the triangular area where the spherical furnace bottom and the furnace lining are combined is gradually corroded, and to a certain extent, molten steel seeps in from the joint, greatly It will affect the life of the furnace and caus...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 刘冲霍斌杨毅
Owner LIAONING ZHONGMEI HLDG
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