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Low-cost environment-friendly tundish fire clay, preparation method and construction method

A tundish, low-cost technology, applied in the field of refractory materials, can solve the problems of human body and environmental damage and pollution, inconvenient application, low cost performance, etc., and achieve the effect of significant economic benefits, easy on-site construction, and lower production costs.

Inactive Publication Date: 2021-10-08
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional tundish fire clay is mostly made of aluminum chrome, and chromium oxide is added to the fire clay. After the tundish is used, the chromium trioxide in the fire clay is transformed into toxic chromium trioxide. If the waste refractories are not recycled properly, it will easily It will cause harm and pollution to the human body and the environment. At the same time, the viscosity of aluminum chrome fire mud is relatively high, so it is inconvenient to apply on site.
In addition, at present, aluminum-chromium fireclay is mostly used after being stirred with water or liquid water glass when used on the construction site. There are also refractory manufacturers who use fireclay and aluminum dihydrogen phosphate solution to mix evenly and then send it to the steel mill for use in barrels. However, due to the large amount of the above-mentioned solution added, the volume of the fire cement will shrink greatly after construction, resulting in a gap between the fire cement and the nozzle. When pouring steel in the tundish, molten steel will easily penetrate through the gap between the fire cement and the nozzle, resulting in steel penetration. There are security risks
In addition, the raw material cost of chromium oxide, corundum or high alumina bauxite used in aluminum chrome fire clay is relatively high, and the cost performance is low

Method used

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  • Low-cost environment-friendly tundish fire clay, preparation method and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A low-cost environment-friendly tundish fire clay described in this embodiment, calculated according to the mass parts, its preparation raw materials include the following components:

[0035] 34 parts of recycled alumina-magnesia brick waste with a particle size of 0.074-0.083mm, 60.6 parts of magnesite with a particle size of 0.074-0.083mm, 2.1 parts of silicon micropowder with a particle size of 3-10μm, and 1.8 parts of clay with a particle size of 0.044-0.074mm, 1.2 parts of aluminate cement with a particle size of 0.04-0.09 mm, 0.2 parts of water reducer KF21, and 0.1 part of polypropylene fiber.

[0036] Among them, in recycled alumina-magnesia brick waste, Al 2 o 3 Content ≥ 50wt%, C content ≥ 4wt%;

[0037] In magnesite, MgO content ≥ 40wt%;

[0038] Silica powder, SiO 2 Content ≥ 92wt%;

[0039] In clay, Al 2 o 3 Content≥30wt%, SiO 2 Content≤55wt%, Fe 2 o 3 Content≤2.0wt%;

[0040] In aluminate cement, Al 2 o 3 The content is 66wt%-74wt%, and the C...

Embodiment 2

[0046] A low-cost environment-friendly tundish fire clay described in this embodiment, calculated according to the mass parts, its preparation raw materials include the following components:

[0047] 31 parts of recycled alumina-magnesia brick waste with a particle size of 0.074-0.083mm, 63.4 parts of magnesite with a particle size of 0.074-0.083mm, 2.9 parts of silicon micropowder with a particle size of 3-10μm, and 0.9 parts of clay with a particle size of 0.044-0.074mm, 1.38 parts of aluminate cement with a particle size of 0.04-0.09 mm, 0.3 parts of water reducer KF21, and 0.12 parts of polypropylene fiber.

[0048] Among them, in recycled alumina-magnesia brick waste, Al 2 o 3 Content ≥ 50%, C content ≥ 4%;

[0049] In magnesite, MgO content ≥ 40%;

[0050] Silica powder, SiO 2 Content ≥ 92%;

[0051] In clay, Al 2 o 3 Content ≥ 30%, SiO 2 Content≤55%, Fe 2 o 3 Content≤2.0%;

[0052] In aluminate cement, Al 2 o 3 The content is 66-74wt%, and the CaO content i...

Embodiment 3

[0058] A low-cost environment-friendly tundish fire clay described in this embodiment, calculated according to the mass parts, its preparation raw materials include the following components:

[0059] 28 parts of recycled alumina-magnesia brick waste with a particle size of 0.074-0.083mm, 66 parts of magnesite with a particle size of 0.074-0.083mm, 2.4 parts of silicon micropowder with a particle size of 3-10μm, and 1.5 parts of clay with a particle size of 0.044-0.074mm, 1.39 parts of aluminate cement with a particle size of 0.04-0.09 mm, 0.6 parts of water reducer KF21, and 0.11 parts of polypropylene fiber.

[0060] Among them, in recycled alumina-magnesia brick waste, Al 2 o 3 Content ≥ 50%, C content ≥ 4%;

[0061] In magnesite, MgO content ≥ 40%;

[0062] Silica powder, SiO 2 Content ≥ 92%;

[0063] In clay, Al 2 o 3 Content ≥ 30%, SiO 2 Content≤55%, Fe 2 o 3 Content≤2.0%;

[0064] In aluminate cement, Al 2 o 3 The content is 66-74wt%, and the CaO content is ...

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Abstract

The invention provides low-cost environment-friendly tundish fire clay, a preparation method and a construction method. The low-cost environment-friendly tundish fire clay is prepared from the following raw materials in parts by mass: 5-40 parts of regenerated alumina-magnesia brick waste, 35-80 parts of magnesite, 0.5-5 parts of silica powder, 0.1-5 parts of clay, 0-4 parts of aluminate cement, 0.1-1 part of a water reducing agent and 0.1-0.3 part of organic fibers. The tundish fire clay does not contain chromium, so that chromium pollution can be avoided; and the regenerated alumina-magnesia brick waste material is adopted as the raw material, the waste material is completely utilized, the production cost is reduced, the regenerated alumina-magnesia brick waste material generates the magnesium aluminate spinel at the high temperature, and the contained Al2O3 reacts with the MgO generated after the magnesite decomposition to generate the magnesium aluminate spinel, so that the volume shrinkage caused by the magnesite decomposition can be made up, the gap between the fire clay and a tundish nozzle is avoided, and the problem of steel seepage is solved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a low-cost environment-friendly tundish fire clay, a preparation method and a construction method. Background technique [0002] The fire clay for the tundish is used to inlay the nozzle of the tundish, and is applied between the nozzle of the tundish and the seat brick. The traditional tundish fire clay is mostly made of aluminum chrome, and chromium oxide is added to the fire clay. After the tundish is used, the chromium trioxide in the fire clay is transformed into toxic chromium trioxide. If the waste refractories are not recycled properly, it will easily It will cause harm and pollution to the human body and the environment, and at the same time, the aluminum-chrome mortar has a high viscosity, which is inconvenient for on-site construction and application. In addition, at present, aluminum-chromium fireclay is mostly used after being stirred with w...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/622
CPCC04B35/043C04B35/62204C04B2235/3418C04B2235/349C04B2235/5212C04B35/6303C04B2235/5436C04B2235/96
Inventor 胡玲军颜浩邓伟于九利赵伟任林刘靖轩史佳朋付朝阳王团收
Owner 北京利尔高温材料股份有限公司
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