Method for preventing carbon-containing fireproof material from slag erosion

An aluminum-carbon refractory material and a technology for refractory materials are applied in the field of metallurgical refractory materials to achieve the effects of reducing erosion, improving slag erosion resistance and increasing slag viscosity

Active Publication Date: 2017-10-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since different steel types have different requirements for slag composition in the process of iron and steel production, simply relying on changing the slag composition cannot meet the smelting process requirements. It is necessary to find a refractory protection method that breaks through the slag composition and is easy to operate.

Method used

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  • Method for preventing carbon-containing fireproof material from slag erosion
  • Method for preventing carbon-containing fireproof material from slag erosion
  • Method for preventing carbon-containing fireproof material from slag erosion

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Prepare slag with an alkalinity of 0.8 according to the ingredients shown in Table 1, place the slag in a graphite crucible and heat it in a high-temperature resistance furnace to melt it. When the temperature reaches 1550°C, keep it for 20 minutes to homogenize the composition of the slag. Decarburized aluminum-carbon bricks fixed on molybdenum rods (φ10×25mm 2 ) as an anode connected to the positive pole of the DC power supply, and another molybdenum rod connected to the negative pole of the power supply to form a cathode (reversely connected to the DC power supply, that is, the molybdenum rod and the refractory material are respectively connected to the positive pole and negative pole of the DC power supply to form a system. anode and cathode, for comparison), the cathode molybdenum rod, the anode refractory sample is immersed in the slag for 5mm, the DC power supply is turned on, the tank voltage is adjusted to 3V, and the sample is taken out after 30 minutes of pow...

Embodiment 2

[0037] Prepare slag with an alkalinity of 0.8 according to the ingredients shown in Table 1, place the slag in a graphite crucible and heat it in a high-temperature resistance furnace to melt it. When the temperature reaches 1550°C, keep it for 20 minutes to homogenize the composition of the slag. Magnesia carbon bricks (φ10×25mm) will be fixed on molybdenum rods 2 ) is used as the cathode connected to the negative pole of the DC power supply, and another molybdenum rod is connected to the positive pole of the power supply to form the anode. The anode molybdenum rod and the cathode refractory material sample are immersed in the slag for 5mm, the DC power supply is turned on, and the tank voltage is adjusted to 4V. Take out the sample after 30 minutes of electrification, and observe the erosion condition on the surface of the two magnesium-carbon refractory materials.

[0038] Under the conditions of the present invention, the interface erosion of cathodically protected MgO—C ...

Embodiment 3

[0040] Prepare a slag sample with a basicity of 2.3 according to the ingredients shown in Table 1, place the mixed powder in a graphite crucible and heat and melt it in a high-temperature resistance furnace. When the temperature reaches 1650°C, keep it for 20 minutes to homogenize the composition of the slag. Connect the decarburized aluminum-carbon refractory material and molybdenum rod to the positive and negative electrodes of the DC power supply respectively, immerse the molybdenum rod and refractory material sample in the slag for 5mm, turn on the DC power supply, adjust the tank voltage to 2V, and take out the sample after 60 minutes of power on. Observe the erosion condition of the refractory surface.

[0041] After 60 minutes of treatment, the surface shape of the refractory material is relatively regular. Figure 4 shown. Using SEM and EDS to observe the cross-section of the aluminum-carbon refractory, it can be found that the thickness of the dense alumina coating ...

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Abstract

The invention discloses a method for preventing carbon-containing fireproof material from slag erosion. Through providing a suitable external voltage for a slag system, the penetration depth f the slag in a fireproof material is delayed, and the physical protection of the fireproof material is realized. The method includes steps of taking aluminum oxide, silica, and calcium oxide as raw materials, and preparing to be the slag powder with alkalinity of 0.8-2.3; heating the mixed powder to 1550-1650 DEG C to melt down; after decarbonization, contacting the carbon-containing fireproof material with slag, and then connecting the fireproof material after decarbonizing treatment and the slag to both electrodes of the power source respectively; electrifying at 0-4V; realizing the protection of carbon-containing fireproof material from slag erosion. The method can effectively inhibit the physical penetration of slag in the carbon-containing fireproof material, significantly improve the slag erosion resistance of the carbon-containing fireproof material, and prolong 3-4 times of the service life of the carbon-containing fireproof material. The method is simple in operation, wide in applicable slag scale, and high in production practical value.

Description

technical field [0001] The invention belongs to the technical field of metallurgical refractory materials, and in particular relates to a method for protecting carbon-containing refractory materials against slag erosion, changing the interface contact angle and interfacial tension between carbon-containing refractory materials and high-temperature slag, and reducing the slag in the refractory materials. Medium penetration depth to achieve longevity of carbon-containing refractories. Background technique [0002] Aluminum carbon refractories (Al 2 o 3 -C) or magnesium carbon refractory (MgO-C) has excellent slag resistance, high thermal shock resistance and good thermal conductivity, and is widely used in the field of iron and steel metallurgy, such as ladle lining, intrusive nozzle and Continuous casting machine lining, etc. As a ladle lining material, in the process of clean steel smelting, due to the physical erosion of high-temperature molten steel and the chemical ero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/00C04B35/66B22D41/02
CPCB22D41/02C04B35/66C04B41/00C04B41/009C04B2235/3206C04B2235/3217C04B2235/422
Inventor 王慧华王德永蒋坤徐英君屈天鹏田俊苏丽娟
Owner SUZHOU UNIV
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