Lightweight micro closed cell magnesium-containing corundum refractory aggregate and preparation method thereof

A refractory aggregate and micro-closed-cell technology, which is applied in the field of light-weight micro-closed-cell magnesia-corundum refractory aggregate and its preparation, can solve the problem that the apparent porosity and pore diameter of the aggregate cannot meet the production requirements, the volume density of the aggregate is reduced, Problems such as apparent porosity and large pore diameter, to achieve the effect of improving slag resistance performance, small average pore size, and strong slag erosion resistance

Active Publication Date: 2015-03-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the currently prepared lightweight refractory aggregates have the defects of high apparent porosity and large average pore diameter...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A light micro-closed-cell magnesium-corundum-containing refractory aggregate and a preparation method thereof. With 92~95wt% γ-Al 2 o 3 Fine powder, 1~4wt% nano-alumina powder and 1~4wt% magnesia micropowder are raw materials, plus 40~60wt% water of the raw materials, mixed, and wet milled with a planetary ball mill for 1.5~3 hours to obtain a slurry ; then place the slurry in the mold, place it at room temperature for 12-24 hours, and demould; then dry the demoulded green body at 110-160°C for 24-36 hours, and dry it at 1750-1850°C Under the condition of ℃ for 5~8 hours, the light micro-closed cell magnesium corundum refractory aggregate can be obtained.

[0023] The lightweight micro-closed-cell magnesium-corundum-containing refractory aggregate prepared in this example is tested: the bulk density is 3.05~3.15g / cm 3 ; The apparent porosity is 5~9%; the average pore diameter is 0.6~1μm.

Embodiment 2

[0025] A light micro-closed-cell magnesium-corundum-containing refractory aggregate and a preparation method thereof. With 92~95wt% γ-Al 2 o 3 Fine powder, 1~4wt% nano-alumina powder and 1~4wt% magnesia micropowder are raw materials, plus 50~70wt% water of the raw materials, mixed, and wet milled with a planetary ball mill for 0.5~1.5 hours to obtain a slurry ; then place the slurry in the mold, place it at room temperature for 12-24 hours, and demould; then dry the demoulded green body at 150-200°C for 12-24 hours, and dry it at 1800-1900°C Keep warm for 1~5 hours under the condition of ℃ to get light micro-closed cell magnesium corundum refractory aggregate.

[0026] The lightweight micro-closed-cell magnesium-corundum-containing refractory aggregate prepared in this example is tested: the bulk density is 3.0~3.1g / cm 3 ; The apparent porosity is 6~10%; the average pore diameter is 0.5~1μm.

Embodiment 3

[0028] A light micro-closed-cell magnesium-corundum-containing refractory aggregate and a preparation method thereof. With 88~92wt% γ-Al 2 o 3 Fine powder, 3~6wt% nano-alumina powder and 3~6wt% magnesia micropowder are raw materials, plus 40~60wt% water of the raw materials, mixed, and wet milled with a planetary ball mill for 1.5~3 hours to obtain a slurry ; then place the slurry in the mold, place it at room temperature for 12-24 hours, and demould; then dry the demoulded green body at 110-160°C for 24-36 hours, and dry it at 1750-1850°C Under the condition of ℃ for 5~8 hours, the light micro-closed cell magnesium corundum refractory aggregate can be obtained.

[0029] The lightweight micro-closed-cell magnesium-corundum-containing refractory aggregate prepared in this example is tested: the bulk density is 2.9~3.1g / cm 3 ; The apparent porosity is 5~7%; the average pore diameter is 0.6~0.8μm.

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Abstract

The invention relates to lightweight micro closed cell magnesium-containing corundum refractory aggregate and a preparation method of the refractory aggregate. The method comprises the steps of taking 80-95wt% of gamma-Al2O3 fine powder, 1-10wt% of nano alumina powder and 1-10wt% of magnesium oxide micropowder as raw materials, adding water accounting for 40-70wt% of the raw materials, mixing, wet-milling with a planet ball mill for 0.5-3h to form slurry, putting the slurry in a mold, placing under a room temperature condition for 12-24h, removing the mold, drying a demolded green body for 12-36h at 110-200 DEG C, and carrying out heat preservation for 1-8h at 1750-1900 DEG C to form the lightweight micro closed cell magnesium-containing corundum refractory aggregate. The prepared lightweight micro closed cell magnesium-containing corundum refractory aggregate has the characteristics of low apparent porosity, high closed porosity, lower volume density, small mean pore size, lower heat conductivity, and strong washout and slag erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory aggregate. In particular, it relates to a light micro-closed-cell magnesium-corundum-containing refractory aggregate and a preparation method thereof. Background technique [0002] With the development of new metallurgical technology, especially the development of external refining and continuous casting technology, ladles undertake more and more important metallurgical tasks, and more stringent requirements are put forward for the lining materials of ladles. At present, the main requirements for ladle lining materials are: (1) Lightweight and energy-saving, which can effectively reduce the heat loss of the ladle, which is of great significance to the control of molten steel quality; The performance of slag needs to be further improved, especially the slag resistance performance of lining materials is quite different under smelting conditions such as different slag systems and steel ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 顾华志付绿平黄奥白晨
Owner WUHAN UNIV OF SCI & TECH
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