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A kind of lightweight aluminum-magnesium castable and preparation method thereof

A castable, aluminum-magnesium technology, applied in the field of aluminum-magnesium castables, can solve the problems of material spalling resistance decline, aluminum-magnesium castable performance defects, ladle lining erosion and other problems, so as to improve thermal spalling resistance and increase high temperature volume. The effect of stability and improving service life

Active Publication Date: 2016-02-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the actual application in steel mills, there are still defects in the performance of the currently prepared aluminum-magnesium castables.
First, during use Al 2 o 3 The spinel produced by the reaction of MgO and MgO can improve the slag resistance of refractory materials, but it is difficult to distribute evenly, resulting in serious local corrosion of the ladle lining; second, the in-situ spinel reaction process brings large permanent lines Expansion leads to a decline in the anti-stripping performance of the material, and the lining material cracks severely in the middle and late stages, and a large area is peeled off; third, the temperature of molten steel drops rapidly inside the ladle, and the heat insulation performance of the lining material needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of the microporous corundum-spinel particles is: using 55-90wt% industrial alumina fine powder, 10-45wt% industrial aluminum hydroxide fine powder, and 3-6wt% magnesium oxide fine powder as raw materials , milled in a ball mill for 0.5-2.5 hours, then formed into balls in a ball-forming machine, and finally fired in a shaft kiln at 1750-1900°C for 2.5-3.5 hours, crushed to a particle size of 0.088-10mm, and obtained Microporous corundum-spinel particles. The MgO content of the microporous corundum-spinel particles is 3~6wt%, the apparent porosity is ≤10%, the closed porosity is ≥10%, and the average pore diameter is ≤1μm.

[0023] The particle diameter of the corundum fine powder is less than 0.088mm.

[0024] The MgO content of the magnesium oxide micropowder is >95wt%, and the particle size is D 50 4~6μm.

[0025] The α-Al 2 o 3 Micronized Al 2 o 3 Content>99wt%, particle size D 50 1~3μm.

[0026] The Al of the alumina-silica gel powder...

Embodiment 1

[0031] A lightweight aluminum-magnesium castable and a preparation method thereof. With 60~63wt% microporous corundum-spinel particles as aggregate, 25~30wt% corundum fine powder, 2~4wt% magnesium oxide fine powder, 3~5wt% α-Al 2 o 3 Micropowder and 3~5wt% aluminum silicate gel powder are base materials; according to the mass percentage of the aggregate and the base material, first mix the base material, and then add the mixed base material In the aggregate, mix evenly, then add 3-10wt% of water accounting for the sum of the aggregate and the base material, stir evenly, vibrate and shape, and maintain at room temperature for 12-24 hours, and finally at 110-200 Under the condition of 12~36 hours, the lightweight aluminum-magnesium castable can be prepared.

[0032] In this embodiment, the corundum fine powder is tabular corundum fine powder.

[0033] The lightweight aluminum-magnesium castable prepared in this example is tested: the line change rate after burning at 1500°C f...

Embodiment 2

[0035] A lightweight aluminum-magnesium castable and a preparation method thereof. Except following base material, all the other are with embodiment 1:

[0036] In this embodiment, the corundum fine powder is white corundum fine powder.

[0037] The lightweight aluminum-magnesium castable prepared in this example is tested: the line change rate after burning at 1500°C for 3 hours is +0.24~+0.28%; the flexural strength retention rate after five times of water cooling at 1100°C is 29~32%; 1500 The erosion index of ℃ static crucible method for slag resistance test is 28~30%, and the penetration index is 56~60%. When applied to 200t refining ladle, the shell temperature decreases by more than 7% on average.

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Abstract

The invention involves a lightweight aluminum -magnesium pouring and its preparation methods.The specific plan is: 60 ~ 75WT%of the micro-hole rigida-spinel granules as aggregate, 10 ~ 30WT%of Gangyu fine powder, 2 ~ 6WT%magnesium pink powder, 3 ~ 8WT%α-Al2O3Micro powder and 3 ~ 8WT%of aluminum silicon gel powder are the matrix; according to the quality of the material and the quality of the substrate, mix itIn the aggregate, mix well, and then occupy the sum of the sum of the material and the content of 3 ~ 10WT%of the material, stir well, and vibrate.In the condition of ° C for 12 ~ 36 hours, lightweight aluminum -magnesium pouring is made.The lightweight aluminum -magnesium pouring materials prepared by the present invention have excellent high temperature volume stability, anti -peeling performance, thermal insulation performance and slag resistance, and can effectively improve the service life of aluminum and magnesium pouring.

Description

technical field [0001] The invention belongs to the technical field of aluminum-magnesium castables. In particular, it relates to a lightweight aluminum-magnesium castable and a preparation method thereof. Background technique [0002] The ladle is an important thermal equipment in the process of iron and steel smelting. The performance of the lining material of the ladle is very important. The length of its life is not only related to the consumption of refractory materials and the cost of steelmaking, but also directly affects the output and quality of steel. Therefore, prolonging the service life of ladle lining has always been the focus of attention in the field of refractory materials. With the development of refining outside the furnace and continuous casting technology, the residence time of molten steel in the ladle is prolonged, and the use conditions of the ladle lining materials are becoming increasingly harsh, and the performance requirements for them are also i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 顾华志付绿平黄奥李正坤张美杰节秀秀
Owner WUHAN UNIV OF SCI & TECH
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