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Refractory material for homogeneous skimming ball for continuous casting ladle and method for making skimming ball

A technology of refractory materials and slag blocking balls, which is applied in the field of metallurgy, can solve problems such as uneven density, reduce eddy currents, and insecurity, and achieve good thermal shock resistance, prevent erosion or melting, and prevent cracking or bursting.

Active Publication Date: 2017-04-26
JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, up to the time of this patent application, both the ladle external induction slag blocking technology and the steel ladle internal slag blocking ball technology have the following deficiencies: [1] The structure of the slag blocking ball is complex and unsafe; [2] It is impossible to eliminate and Reduce eddy current; [3] The slag blocking ball contains iron or iron oxide, and the density is not uniform, so it cannot be used for a long time in the high temperature continuous casting ladle without being corroded or melted; [4] The slag blocking ball has thermal shock resistance stability Not enough, can not withstand the ultra-high temperature gradient after being directly put into the high-temperature ladle, resulting in cracking or bursting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After removing iron from various qualified raw materials purchased, the ratio by weight is as follows:

[0025] Raw material name Particle size Weight percentage (wt%)

[0026] Stabilized zirconia 3~8mm 40.0

[0027] 40~70 mesh 14.0

[0028] 100~180 mesh 6.0

[0029] 300~500 mesh 13.0

[0030] Fused corundum 1~3mm 10.0

[0031] 40~70 mesh 3.8

[0032] 100~180 mesh 2.5

[0033] 300~500 mesh 4.0

[0034] Feather polysilicon ≤1μm 3.0

[0035] SiC fine powder ≤5μm 3.2

[0036] Water reducer 0.46

[0037] Explosion-proof fiber 0.04

[0038] Silica sol (additional) 3.8

[0039] During production, the raw materials of stabilized zirconia and fused corundum particles prepared according to the ratio table were premixed for 10 minutes, then various raw materials prepared according to the ratio table were added, mixed for 15 minutes, 3.8wt% silica sol was added and mixed evenly, poured Put it into a mold to make a spherical shape with a diameter of 160mm, leave the mol...

Embodiment 2

[0042] After removing iron by magnetite, the total iron content in the raw material is still 0.79%, and then carry out pickling to remove iron, and put the particles and fine powder of stabilized zirconia and corundum into 45% (w / w) hydrochloric acid solution for 15 hours After taking it out, wash it with water and dry it for later use.

[0043] Each raw material after iron removal is proportioned as follows by weight:

[0044] Raw material name Particle size Weight percentage (wt%)

[0045] Stabilized zirconia 3~8mm 31.0

[0046] 40~70 mesh 14.0

[0047] 100~180 mesh 7.0

[0048] 300~500 mesh 15.2

[0049] Fused corundum 1~3mm 15.5

[0050] 40~70 mesh 4.0

[0051] 100~180 mesh 2.8

[0052] 300~500 mesh 3.0

[0053] Feather polysilicon ≤1μm 4.27

[0054] SiC fine powder ≤5μm 3.0

[0055] Water reducer 0.2

[0056] Explosion-proof fiber 0.03

[0057] Silica sol (additional) 6.5

[0058] During production, the raw materials of stabilized zirconia and fused corundum ...

Embodiment 3

[0061] After removing iron from various qualified raw materials purchased, the ratio by weight is as follows:

[0062] Raw material name Particle size Weight percentage (wt%)

[0063] Stabilized zirconia 3~8mm 34.0

[0064] 40~70 mesh 14.0

[0065] 100~180 mesh 6.2

[0066] 300~500 mesh 16.0

[0067] Fused corundum 1~3mm 12.0

[0068] 40~70 mesh 4.2

[0069] 100~180 mesh 3.0

[0070] 300~500 mesh 3.0

[0071] Feather polysilicon ≤1μm 5.0

[0072] SiC fine powder ≤5μm 2.04

[0073] Water reducer 0.5

[0074] Explosion-proof fiber 0.06

[0075] Silica sol (additional) 3.5

[0076] During production, the raw materials of stabilized zirconia and fused corundum particles prepared according to the ratio table were premixed for 10 minutes, then various raw materials prepared according to the ratio table were added, mixed for 15 minutes, 3.5wt% silica sol was added and mixed evenly, poured Put it into a mold to make a spherical shape with a diameter of 150mm, leave the mol...

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Abstract

Provided is a refractory material for a homogeneous skimming ball for a continuous casting ladle. The refractory material is prepared from, by weight, 62%-80% of ZrO2, 14%-32% of Al2O3, 2%-6% of SiO2, 2%-4% of SiC, 3.0%-6.5% of silica sol and the balance inevitable impurities. The phenomenon that slag in the ladle enters tundish can be effectively prevented, the heat shock resistance stability is good, erosion or melting is prevented, and cracking or busting is effectively prevented.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a homogeneous slag retaining ball for continuous casting ladles. Background technique [0002] In the metallurgical process, it is a well-known technical requirement to prevent metallurgical slag from entering molten steel. At present, during the tapping process of the converter, the slag blocking technology is relatively mature, and many invention patents and utility model patents on the converter slag blocking plug or slag blocking ball have been published, such as: ZL201620229498.3, ZL201620123722.0, ZL201220656139.8, ZL201420812925.1, ZL201220340602.8, ZL201620001804.8, add appropriate metal or metal oxide weight inside the outer body of refractory material, and various designs are made on the shape to enhance the slag blocking effect. Because the tapping time of the converter is only about 3 minutes, and the slag stopper or slag ball can be added into the converter by machinery at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/482C04B35/71C04B35/622B22D41/00
CPCB22D41/00C04B35/481C04B35/482C04B35/622C04B35/71C04B2235/3217C04B2235/3418C04B2235/3826C04B2235/428C04B2235/52C04B2235/5436C04B2235/77C04B2235/94C04B2235/9676
Inventor 吴永来于小方孔凡杰杨政宏李杰汤致奎张兴华姜爱君
Owner JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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