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Carbon-free unburned brick and production method thereof

A technology of non-burning bricks and refractory aggregates, which is applied in the direction of casting molten material containers, manufacturing tools, metal processing equipment, etc., can solve the problems of affecting the overall stability of use, increased heat loss of ladle, poor anti-stripping performance, etc., and achieves Use stability and slag erosion resistance are improved, the service life is improved, and the compressive strength is high.

Inactive Publication Date: 2010-08-18
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The thermal conductivity of carbon is large, which leads to an increase in the thermal conductivity of magnesia-carbon bricks and aluminum-magnesia-carbon bricks, an increase in the heat loss of the ladle, and an increase in the temperature drop of molten steel, which is not conducive to the subsequent smelting process
[0004] 2. Using magnesia-carbon bricks and aluminum-magnesia-carbon bricks as the working layer of the ladle, the carbon will diffuse into the molten steel and affect the quality of the molten steel
[0005] 3. Magnesia-carbon bricks and aluminum-magnesia-carbon bricks are used as the working layer of the ladle. After the ladle is used, with the oxidation of carbon, the magnesia-carbon bricks and aluminum-magnesia-carbon bricks will disintegrate due to loose structure, and the service life is limited.
[0006] The patent application with application number 02117370.2 discloses a carbon-free ladle working lining prefabricated block, but the carbon-free ladle working lining prefabricated block has the following disadvantages: (1) The prefabricated block has a small volume density, which affects the overall stability of use, Poor peeling resistance
(2) The porosity of the prefabricated block is too large, which affects the slag resistance performance

Method used

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  • Carbon-free unburned brick and production method thereof
  • Carbon-free unburned brick and production method thereof
  • Carbon-free unburned brick and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Production of carbon-free unfired bricks of the present invention

[0026] 1. Weighing

[0027] Weigh each material according to the proportioning in Table 1. Among them, brown corundum, α-Al 2 o 3 The source of raw materials for micropowder and sintered magnesia powder is commercially available products, and the saturated magnesium chloride solution is self-prepared.

[0028] Table 1 Ratio of each material

[0029]

[0030] 2. Mixing (mixing by rolling method)

[0031] Before production, the residual material in the mud mill should be cleaned up, and there must be no impurities or agglomerates. 600-1200kg of mud for each milling should be ensured to be evenly milled without lumps of raw material. The feeding order of mud milling is: the aggregate is first mixed for 5 minutes, then 1 / 3 of the binder is added and mixed for 5 minutes, and then α-Al 2 o 3 The micropowder, sintered magnesia powder and the remaining 2 / 3 binder are mixed and milled for 8 ...

Embodiment 2

[0036] Example 2 Production of carbon-free unfired bricks of the present invention

[0037] 1. Weighing

[0038] Weigh each material according to the proportioning in Table 2. Among them, white corundum, α-Al 2 o 3 The source of raw materials for micropowder and sintered magnesia powder is commercially available products, and the saturated magnesium chloride solution is self-prepared.

[0039] Table 2 Ratio of each material

[0040]

[0041] 2. Mixing (mixing by rolling method)

[0042] Before production, the residual material in the mud mill should be cleaned up, and there must be no impurities or agglomerates. 600-1200kg of mud for each milling should be ensured to be evenly milled without lumps of raw material. The feeding order of mud milling is: the aggregate is first mixed for 5 minutes, then 1 / 3 of the binder is added and mixed for 5 minutes, and then α-Al 2 o 3 The micropowder, sintered magnesia powder and the remaining 2 / 3 binder are mixed and milled for 8 ...

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Abstract

The invention relates to a carbon-free unburned brick and a production method thereof, belonging to the field of inorganic materials. The invention aims to provide the carbon-free unburned brick with longer service life. The carbon-free unburned brick is prepared by the following raw materials in parts by weight: 60-80 parts of refractory aggregates, 13-32 parts of refractory powder, 7-15 parts of active alpha-Al2O3 powder and a proper quantity of bonding agents, wherein the refractory aggregates are corundum; the refractory powder is the mixture of 3-7 parts of magnesia powder and 10-25 parts of corundum powder; and the bonding agents are MgCl2 solution. Compared with the existing products, the carbon-free unburned brick has higher compression strength and bulk density, reduces the porosity and improves the integral use stability and corrosion resistance to slag of the products, thereby prolonging the service lives of the products.

Description

technical field [0001] The invention relates to a carbon-free burn-free brick and a production method thereof, belonging to the field of inorganic materials. Background technique [0002] Ladle is an important transshipment and refining container in the steelmaking production process. With the progress of smelting technology (mainly refining) and the increase of steel output, steel mills are urgently required to improve the service life of ladle lining. Initially, high-alumina bricks were used as the lining material of the ladle. Since the steel slag is alkaline slag and the high-alumina brick is an acid refractory material, the steel slag severely corrodes the high-alumina brick, resulting in a low service life of the lining of the ladle. In order to improve the service life of the ladle lining, the ladle lining is developed in the direction of comprehensive masonry, magnesia-carbon bricks are used for the slag line, aluminum-magnesia-carbon bricks are used below the slag ...

Claims

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Application Information

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IPC IPC(8): B22D41/02C04B35/66C04B35/622
Inventor 李亮姚牧
Owner PANZHIHUA UNIV
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