Lightweight aluminum-magnesium castable and preparation method of lightweight aluminum-magnesium castable

A castable, magnesium-based technology, applied in the field of refractory castables, can solve the problems of slag erosion resistance to be improved, the matrix is ​​not dense enough, and the apparent porosity is high, and achieves strong erosion resistance, small average pore size, and obvious porosity. low rate effect

Inactive Publication Date: 2013-04-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous ceramic aggregate used in this invention still has the problems of large pore size (10 μm) and high apparent porosi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A light aluminum-magnesium castable and a preparation method thereof. With 60~75wt% microporous corundum particles as aggregate, 15~30wt% corundum fine powder, 6~10wt% magnesium oxide micropowder and 4~7wt% active α-alumina micropowder as base materials; The polycarboxylate water reducer is premixed with the base material, the polycarboxylate water reducer is 0.05~0.15wt% of the sum of the aggregate and the base material, and then the premixed base material is added to the aggregate, and then Add 7-10wt% of binder, stir evenly, and prepare aluminum-magnesium light-weight castable.

[0027] In this embodiment, the preparation method of the microporous corundum particles is: use industrial alumina fine powder as raw material, add 40-50wt% water of the raw material, mix, wet mill on a ball mill for 2-3 hours, wait for The wet abrasive slurry is solidified, kept at 110-1600°C for 24-48 hours, and then kept at 1700-1820°C for 5-8 hours to obtain microporous corundum particl...

Embodiment 2

[0031] A light aluminum-magnesium castable and a preparation method thereof. Except following aggregate and binding agent, all the other are the same as embodiment 1.

[0032] In this embodiment, the preparation method of the microporous corundum particles is: using 55-99wt% industrial alumina fine powder and 1-45wt% industrial aluminum hydroxide fine powder as raw materials, and then adding 70-80wt% of the raw materials % water, mixed, and wet milled on a ball mill for 0.5-1 hour. After the wet abrasive slurry is solidified, it is kept at 150-200°C for 12-24 hours, and then at 1780-1870°C for 1-3 hours. Microporous corundum particles were obtained.

[0033] The binder described in this embodiment is a mixture of cement and silica powder.

[0034] The aluminum-magnesium lightweight castable prepared in this example is tested: the bulk density is 2.4~2.5g / cm 3, The apparent porosity is 25~28%, the flexural strength after burning at 1500℃×3h is 17-18Mpa, and the compressi...

Embodiment 3

[0036] A light aluminum-magnesium castable and a preparation method thereof. Except following corundum fine powder, aggregate and bonding agent, all the other are the same as embodiment 1.

[0037] In this embodiment, the preparation method of the microporous corundum particles is: 55~99wt% industrial alumina fine powder and 1~45wt% α-Al 2 o 3 Micropowder is used as the raw material, and 60~70wt% of the raw material is added to the water, mixed, and wet milled on a ball mill for 2~3 hours. After the wet abrasive slurry is solidified, it is kept at 150~200°C for 12~24 hours, and then heated at 1790 Microporous corundum particles were prepared by incubating at ~1900°C for 3 to 5 hours.

[0038] In this embodiment: the corundum fine powder is tabular corundum fine powder; the binder is silicon micropowder.

[0039] The aluminum-magnesium lightweight castable prepared in this example is tested: the bulk density is 2.6~2.7g / cm 3 , The apparent porosity is 20~22%, the flexural s...

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Abstract

The invention relates to a lightweight aluminum-magnesium castable and a preparation method of the lightweight aluminum-magnesium castable. The technical scheme is as follows: using 60-85wt% of microporous corundum granules as an aggregate, and using 5-30wt% of fine corundum powder, 2-10wt% of magnesium oxide micropowder and 4-9wt% of alpha-aluminum micropowder as matrix materials; premixing a polycarboxylate-type water reducer and the matrix materials firstly, wherein the polycarboxylate-type water reducer is 0.05-0.3wt% of the sum of the aggregate and the matrix materials; adding the premixed matrix materials into the aggregate; and then additionally adding a binding agent which is 3-10wt% of the sum of the aggregate and the matrix materials, and stirring uniformly to obtain the lightweight aluminum-magnesium castable. The lightweight aluminum-magnesium castable prepared by the method has the characteristics of small volume density, low apparent porosity, large high-temperature strength, good volume stability, low thermal conductivity and strong capability of resisting the corrosion of media such as steel slag; and the prepared lightweight aluminum-magnesium castable is applied to a working lining of a high-temperature industrial furnace, the energy consumption can be reduced, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of refractory castables. Specifically relates to a light aluminum-magnesium castable and a preparation method thereof. Background technique [0002] The ladle is an important equipment for storing, transporting and refining molten steel, and many new steel types are completed in the ladle. Its lining refractory material has been in contact with molten steel for a long time, and it has been subjected to frequent erosion by molten steel at high temperature for a long time, and corrosion of alloys and refining slag under vacuum, etc., resulting in a significant reduction in the service life of the refining ladle. [0003] A batch of materials with lower thermal conductivity have been developed to solve the problems of large energy loss in the ladle and the influence of the cooling of molten steel on the quality of finished products. Such as vermiculite, perlite, ceramsite and fiber castables, etc., but thei...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 白晨顾华志黄奥张美杰邹阳
Owner WUHAN UNIV OF SCI & TECH
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