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Micropore high-strength corundum-calcium hexaluminate composite refractory raw material and preparation method thereof

A technology of calcium hexaaluminate and refractory raw materials, which is applied in the field of corundum-calcium hexaaluminate refractory materials, which can solve the problems of large voids, high porosity, and inability to resist erosion and erosion, and achieve small volume density and small pore size , Excellent thermal shock resistance

Active Publication Date: 2012-10-10
JIANGSU JINGXIN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the energy-saving effect of lightweight materials produced at home and abroad is better, but most of them have high porosity and large gaps, which cannot resist erosion and erosion, and are difficult to be used in ladle lining materials with harsh service conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A microporous high-strength corundum-calcium hexaaluminate composite refractory material and a preparation method thereof. 94~96wt% alumina fine powder is used as aluminum source, 3~6wt% calcium carbonate fine powder is used as calcium source, and 30~40wt% water is added to the total amount of the above raw materials, mixed, and wet milled on a ball mill for 0.5~1 Hours, when the wet abrasive slurry is solidified, heat it at 110-160°C for 24-48 hours, then keep it at 1750-1800°C for 3-4 hours, after the fired product is broken, you can get microporous high-strength corundum-hexaaluminate Calcium composite refractory raw material.

[0018] The bulk density of the microporous corundum-calcium hexaaluminate composite refractory material prepared in this example is 2.9-3.0 g / cm 3 , the apparent porosity is 6-8%, and the average pore diameter is 7-10 μm.

Embodiment 2

[0020] A microporous high-strength corundum-calcium hexaaluminate composite refractory material and a preparation method thereof. Use 96~98wt% alumina fine powder as the aluminum source, 1~4wt% calcium carbonate fine powder as the calcium source, and add 40~50wt% water of the above raw materials, mix and wet grind on a ball mill for 1~1.5 Hours, when the wet abrasive slurry is solidified, keep it at 150-200°C for 12-24 hours, then keep it at 1800-1850°C for 4-5 hours, after the fired product is broken, you can get microporous high-strength corundum-hexaaluminate Calcium composite refractory raw material.

[0021] The bulk density of the microporous corundum-calcium hexaaluminate composite refractory material prepared in this example is 3.0-3.1 g / cm 3 , the apparent porosity is 5-7%, and the average pore diameter is 4-7μm.

Embodiment 3

[0023] A microporous high-strength corundum-calcium hexaaluminate composite refractory material and a preparation method thereof. 94~96wt% alumina fine powder is used as aluminum source, 3~6wt% calcium hydroxide fine powder is used as calcium source, and 50~60wt% water is added to the total amount of the above raw materials, mixed, and wet milled on a ball mill for 1.5~ After 2 hours, when the wet abrasive slurry is solidified, heat it at 110-160°C for 24-48 hours, and then keep it at 1850-1900°C for 3-4 hours. After the fired product is broken, you can get microporous high-strength corundum-hexaluminum Calcium acid composite refractory raw material.

[0024] The bulk density of the microporous corundum-calcium hexaaluminate composite refractory material prepared in this example is 3.1-3.2 g / cm 3 , the apparent porosity is 4 to 6%, and the average pore diameter is 2 to 4 μm.

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Abstract

The invention relates to a micropore high-strength corundum-calcium hexaluminate composite refractory raw material and a preparation method of the material. The technical scheme adopted by the invention is as follows: 94-98wt% of aluminum oxide fine powder or aluminium hydroxide fine powder is taken as an aluminium source; 1-6wt% of calcium carbonate fine powder or calcium hydroxide fine powder is taken as a calcium source; water is added into the raw materials, and the quantity of the water is 30-60wt% of the total quantity of the raw materials; the raw materials are mixed in the water; wet grinding is carried out on the mixture by virtue of a ball grinding mill for 0.5-2 hours; after being solidified, the slurry processed by wet grinding is subjected to heat preservation for 12-48 hours at the temperature of 110-200 DEG C; then, heat preservation is carried out at 1750-1900 DEG C for 3-5 hours; and finally, after the product is burnt and crushed, the micropore high-strength corundum-calcium hexaluminate composite refractory raw material can be obtained. The micropore high-strength corundum-calcium hexaluminate composite refractory raw material prepared by the method has the characteristics of being high in slag resistance, excellent in thermal shock resistance and heat-insulating property and the like, and can be used at the parts such as a steel ladle and the like contacted with molten steel and used for replacing corundum in other refractory material taking the corundum as a raw material, so that the service life of the material is prolonged, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of corundum-calcium hexaaluminate refractory materials. In particular, it relates to a microporous high-strength corundum-calcium hexaaluminate composite refractory raw material and a preparation method thereof. Background technique [0002] With the development of out-of-furnace refining and continuous casting technology, the ladle has gradually changed from a single-function molten steel container to an out-of-furnace molten steel refining equipment with complex functions. In order to meet the actual production requirements, alumina-magnesia-carbon bricks and alumina-rich spinel carbon bricks are generally used as lining materials for domestic ladles. Using aluminum-magnesium-carbon bricks and aluminum-rich spinel carbon bricks as lining materials, on the one hand, it has a significant effect on increasing the carbon content of molten steel, which is not conducive to the production of clean steel and low...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 李正坤顾华志张家勤黄奥杜博
Owner JIANGSU JINGXIN NEW MATERIAL
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