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A protection method for carbon-containing refractories against slag erosion

A technology of refractory materials and slag, which is applied in the field of metallurgical refractories to achieve the effects of easy operation, increased contact angle, and increased viscosity of slag

Active Publication Date: 2019-11-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A protection method for carbon-containing refractories against slag erosion
  • A protection method for carbon-containing refractories against slag erosion
  • A protection method for carbon-containing refractories against slag erosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A slag with an alkalinity of 0.8 was prepared according to the ingredients shown in Table 1, and the slag was placed in a graphite crucible and heated in a high-temperature resistance furnace to melt. When the temperature reaches 1550℃, keep it for 20min to even the slag composition. Aluminium carbon brick (φ10×25mm 2 ) As the anode connected to the positive pole of the DC power supply, another molybdenum rod is connected to the negative pole of the power supply to form the cathode (reversely connected to the DC power supply, that is, the molybdenum rod and refractory material are respectively connected to the positive and negative poles of the DC power supply to form the system The anode and cathode are compared), the cathode molybdenum rod and anode refractory material sample are immersed in the slag for 5mm, the DC power supply is turned on, the voltage of the tank is adjusted to 3V, and the sample is taken out after powering on for 30 minutes. Observe the two conditio...

Embodiment 2

[0037] A slag with an alkalinity of 0.8 was prepared according to the ingredients shown in Table 1, and the slag was placed in a graphite crucible and heated in a high-temperature resistance furnace to melt. When the temperature reaches 1550℃, keep it for 20min to even the slag composition. Will be fixed on the molybdenum rod magnesia carbon brick (φ10×25mm 2 ) As the cathode connected to the negative pole of the DC power supply, 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 sample are immersed in the slag for 5mm, the DC power supply is turned on, and the tank voltage is adjusted to 4V. The sample was taken out after 30 minutes of electrification, and the corrosion condition of the surface of the two magnesia carbon refractories was observed.

[0038] SEM is used to observe the interface corrosion of the cathodic protected MgO-C refractory under the conditions of the present inv...

Embodiment 3

[0040] A slag sample with an alkalinity of 2.3 was prepared according to the ingredients shown in Table 1, and the mixed powder was placed in a graphite crucible and heated in a high-temperature resistance furnace to melt. When the temperature reaches 1650℃, keep it for 20min to even the slag composition. Connect the decarburized aluminum-carbon refractories and molybdenum rods to the positive and negative electrodes of the DC power supply, respectively, immerse the molybdenum rods and refractory samples into the slag for 5mm, turn on the DC power supply, adjust the tank voltage to 2V, and take out the samples after 60 minutes of power on. Observe the corrosion status of the refractory surface.

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

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Abstract

The invention discloses a protection method for a carbon-containing refractory material against slag erosion. By providing a suitable external voltage for the slag system, the penetration depth of the slag in the refractory material is slowed down, and the physical protection of the refractory material is realized. Alumina, silica, and calcium oxide are used as raw materials to prepare slag powder with a basicity of 0.8~2.3, and the mixed powder is heated to 1550~1650°C to melt; the carbon-containing refractory is decarburized and mixed with slag Contact, and then connect the decarburized refractory material and slag to the two poles of the power supply; then energize at 0-4V to realize the protection of the carbon-containing refractory material against slag erosion. It can effectively inhibit the physical penetration of slag in carbon-containing refractories, significantly improve the slag intrusion resistance of carbon-containing refractories, and increase the service life of carbon-containing refractories by more than 3 to 4 times. The invention is simple to operate, applicable to a wide range of slag systems, and has high production practical value.

Description

Technical field [0001] The invention belongs to the technical field of metallurgical refractory materials, and specifically relates to a method for protecting carbon-containing refractories against molten slag erosion, changing the interface contact angle and interfacial tension between carbon-containing refractories and high-temperature molten slag, and reducing the slag in the refractory Medium penetration depth to achieve longevity of carbon-containing refractories. Background technique [0002] Aluminum carbon refractories (Al 2 O 3 -C) or magnesia-carbon refractory material (MgO-C) has excellent slag resistance, high thermal shock resistance and good thermal conductivity, and is widely used in the field of 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 erosion of slag, not only...

Claims

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Application Information

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Patent Type & Authority Patents(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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