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Slag-stopping wall brick for slag-free tapping of quantum electric arc furnace and preparation method of slag-stopping wall brick

A slag-retaining wall brick and electric arc furnace technology, which is applied in the field of refractory materials, can solve the problems affecting the consumption of refractory materials per ton of steel and production efficiency of quantum electric furnaces, the inability of quantum electric furnaces to implement siphon slag-free tapping, low-temperature mechanical properties and low mechanical strength, etc. problems, to achieve the effect of solving excessive melting loss, improving thermal shock stability, improving high temperature strength and thermal shock resistance

Inactive Publication Date: 2022-01-28
SHANGHAI LIER REFRACTORY MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although magnesia-carbon bricks have excellent slag erosion resistance, their high-temperature mechanical properties and mechanical strength are low, and their resistance to molten steel erosion is poor. At present, the service life of magnesia-carbon slag-retaining wall bricks for quantum electric furnaces is low (about 300 furnaces) , resulting in the inability of the quantum electric furnace to implement siphon slag-free tapping, and forced to go offline to replace the slag-retaining wall bricks, seriously affecting the consumption of refractory materials per ton of steel and production efficiency of the quantum electric furnace

Method used

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preparation example Construction

[0026] A method for preparing a slag-retaining wall brick for slag-free tapping of a quantum electric arc furnace, the specific steps are as follows:

[0027] S1, take large crystalline magnesia, flaky graphite, metallic aluminum powder, activated alumina micropowder, carbon-containing resin powder, thermosetting phenolic resin and silicon micropowder, and set aside;

[0028] S2, grinding the large crystalline magnesia to fineness, grading it into four kinds of granular raw materials with different particle sizes: 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0029] S3, grinding metal aluminum powder and carbon-containing resin into fine powder with a particle size of ≤200 mesh, and grinding activated alumina fine powder into fine powder with a median diameter of 1 μm to obtain metallic aluminum powder, carbon-containing resin powder and activated alumina fine powder ,spare;

[0030] S4, take 68-80% of large crystalline magnesia, 10-18% of flake graphite, 1-3% of metal a...

Embodiment 1

[0035] Step 1, get large crystalline magnesia, flaky graphite, metallic aluminum powder, activated alumina micropowder, carbon-containing resin powder, thermosetting phenolic resin and silicon micropowder, and set aside;

[0036] Step 2: Grinding the large crystalline magnesia, and grading it into 5-3mm, 3-1mm, 1-0mm and 200 mesh four kinds of granular raw materials with different particle sizes, for later use;

[0037] Step 3: Grinding the metal aluminum powder and the carbon-containing resin into a fine powder with a particle size of ≤200 mesh, and grinding the activated alumina micropowder into a fine powder with a median diameter of 1 μm to obtain the metal aluminum powder, carbon-containing resin powder and activated alumina Micropowder, spare;

[0038] Step 4, take 75% of large crystalline magnesia, 15% of flake graphite, 2% of metal aluminum powder, 5% of additives, 3% of thermosetting phenolic resin and 2% of silicon micropowder by weight percentage, wherein the partic...

Embodiment 2

[0042] Step 1, get large crystalline magnesia, flaky graphite, metallic aluminum powder, activated alumina micropowder, carbon-containing resin powder, thermosetting phenolic resin and silicon micropowder, and set aside;

[0043] Step 2: Grinding the large crystalline magnesia, and grading it into 5-3mm, 3-1mm, 1-0mm and 200 mesh four kinds of granular raw materials with different particle sizes, for later use;

[0044] Step 3: Grinding the metal aluminum powder and the carbon-containing resin into a fine powder with a particle size of ≤200 mesh, and grinding the activated alumina micropowder into a fine powder with a median diameter of 1 μm to obtain the metal aluminum powder, carbon-containing resin powder and activated alumina Micropowder, spare;

[0045] Step 4, take 76% of large crystal magnesia, 16% of flake graphite, 2% of metal aluminum powder, 3% of additive, 3% of thermosetting phenolic resin and 2.5% of silicon micropowder by weight percentage, wherein the particle ...

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Abstract

The invention relates to the technical field of refractory materials, in particular to a slag-stopping wall brick for slag-free tapping of a quantum electric arc furnace. The slag-stopping wall brick is prepared from the following raw materials in percentage by weight: 68-80% of macrocrystalline magnesia, 10-18% of crystalline flake graphite, 1-3% of metal aluminum powder, 1-5% of an additive, 2-8% of thermosetting phenolic resin and 2-3% of silica powder. By designing the slag-stopping wall brick for slag-free tapping of the quantum electric arc furnace, the problem that an existing slag-stopping wall brick is too fast in melting loss due to slag erosion and molten steel scouring is effectively solved, so that the melting loss rate of the slag-stopping wall brick of the quantum electric furnace built by the slag-stopping wall brick is low, the consumption of refractory materials per ton of steel of the slag-stopping wall brick can be obviously reduced, and then the overall service life of the quantum electric furnace is longer.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a slag-retaining wall brick for slag-free tapping of a quantum electric arc furnace and a preparation method thereof. Background technique [0002] Quantum electric arc furnace is a new type of electric arc furnace steelmaking technology introduced from abroad in recent years, referred to as EAF-Quan tum. EAF-Quantum combines many mature technology applications. It is characterized by waste gas recycling and preheating scrap steel technology. It creatively adopts the FAST (advanced slag-free tapping) tapping system. The tapping hole and the molten pool are separated by a siphon device. This system has The following advantages: slag-free tapping is realized through the siphon device. [0003] At present, the service life of electronic arc furnaces put into production in China has not reached expectations, mainly due to slag erosion of slag retaining wall bricks and s...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/634F27D1/04
CPCF27D1/045C04B35/043C04B35/63476C04B35/634C04B2235/425C04B2235/402C04B2235/3418C04B2235/5427C04B2235/5436C04B2235/3217C04B2235/9676
Inventor 李维锋李洪波马四凯李勇伟魏振国
Owner SHANGHAI LIER REFRACTORY MATERIAL
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