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Method for preparing tabular corundum brick for working lining of carbon-free steel ladle

A carbon-free ladle and corundum brick technology, applied in the field of refractory materials, can solve the problems of hindering life and shortening the service life of corundum spinel prefabricated bricks, etc., to achieve improved stability and strength, good anti-stripping performance, and good volume stability Effect

Active Publication Date: 2014-08-20
ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the integral castables of carbon-free materials mainly use pure calcium aluminate cement as the binder. It is an impurity in high-purity corundum spinel prefabricated bricks, which will shorten the service life of corundum spinel prefabricated bricks and hinder the extension of life to a certain extent

Method used

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  • Method for preparing tabular corundum brick for working lining of carbon-free steel ladle
  • Method for preparing tabular corundum brick for working lining of carbon-free steel ladle
  • Method for preparing tabular corundum brick for working lining of carbon-free steel ladle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mix plate-like corundum and magnesia evenly, then add magnesium-aluminum cement and water in sequence, and finally add mixed powder composed of magnesium-aluminum spinel, activated alumina ultrafine powder and activated silica ultrafine powder, and mix well , to obtain mud; the weight loss of the magnesium-aluminum cement under the condition of 1050 ° C is less than 30%.

[0042] See Table 1 for the proportions by weight of platy corundum, magnesia, magnesia-alumina spinel, activated alumina superfine powder, activated silica superfine powder, magnesia-alumina spinel and water;

[0043] (2) The mud material is pressed into shape, and baked at 180-200° C. for 8 hours to obtain a plate-shaped corundum brick.

[0044] The particle size distribution of tabular alumina in this embodiment is: 8-5mm6wt%; 5-3mm25wt%; 3-1mm38wt%; 1-0mm16wt%; -180 mesh (ie, particle size≤0.088mm) 15wt%;

[0045] The particle size distribution of fused magnesia is: 1~0mm60wt%; -180 mesh 40wt%...

Embodiment 2

[0051] Using the same preparation method as in Example 1, the proportions by weight of tabular corundum, magnesia, magnesia-alumina spinel, activated alumina superfine powder, activated silica superfine powder, magnesia-alumina spinel and water are shown in Table 2 .

[0052] Table 2

[0053]

Embodiment 3

[0055] Using the same preparation method as in Example 1, the proportions by weight of tabular corundum, magnesia, magnesia-alumina spinel, activated alumina superfine powder, activated silica superfine powder, magnesia-alumina spinel and water are shown in Table 3 .

[0056] table 3

[0057]

[0058]

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Abstract

The invention discloses a method for preparing a tabular corundum brick for a working lining of a carbon-free steel ladle. The method comprises the steps of uniformly mixing the raw materials of the tabular corundum brick, and sequentially carrying out compression molding pressing and low-temperature baking to obtain the tabular corundum brick, wherein the tabular corundum brick comprise the following raw materials in parts by weight: 76-91 parts of tabular corundum, 0.5-9 parts of magnesia, 0.5-20 parts of magnesium-aluminum spinel, 1-9 parts of activated aluminum oxide ultrafine powder, 0.1-2 parts of activated silicon oxide ultrafine powder, 1.5-5 parts of a magnesium-aluminum cementing agent and 1.5-2.5 parts of water. The method for preparing the tabular corundum brick for the working lining of the carbon-free steel ladle is simple, the service life of the tabular corundum brick is long and free of carbon, and the tubular corundum brick can satisfy the demands on clean steelmaking.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a method for preparing a plate-shaped corundum brick used for the working lining of a carbon-free ladle. Background technique [0002] With the development of out-of-furnace refining and continuous casting technology, the function of large ladles has gradually changed from a single container for carrying molten steel to complex out-of-furnace molten steel refining equipment. [0003] The prolongation of the residence time of molten steel in the ladle and the increase of tapping temperature make the working environment of the ladle more harsh. In order to adapt to changes in the working environment of ladles, high-quality alumina-magnesia-carbon bricks and alumina-rich spinel carbon bricks are generally used in domestic ladles, but there will be some problems when using alumina-magnesia-carbon bricks and alumina-rich spinel carbon bricks as the working lining of ladles On the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 沈明科方斌祥方义能尹明强张磊
Owner ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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