Preparation method for microporous light-weight corundum fireproof aggregate

Abstract

The invention relates to a microporous lightweight corundum refractory aggregate and a production method thereof. The technical solution is: use 55wt%~100wt% industrial alumina fine powder, 0wt%~45wt% industrial aluminum hydroxide fine powder or α-Al2O3 micropowder as raw materials, dry grind on a ball mill for 0.5~3 hours, and then Balls are formed in the ball forming machine, and the size of the ball blank is 20-30mm. Finally, it is quickly fired in a shaft kiln under the condition of 1700~1950°C to obtain a microporous lightweight corundum refractory aggregate. This kind of microporous lightweight corundum aggregate has a simple production process and is suitable for large-scale industrial production. It has the advantages of small pore size, high strength, low thermal conductivity, erosion resistance and corrosion resistance, and can be used for direct contact between ladle walls and molten steel. The parts in contact can also be used in tapping troughs, slide plates, breathable bricks, etc., as well as other industrial kilns such as petrochemicals and ceramics, which can significantly reduce energy consumption.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials. Specifically relates to a microporous lightweight corundum refractory aggregate and a preparation method thereof. Background technique [0002] The technological progress of refractory materials and the development of high-temperature industry influence and promote each other. Refractory materials are not only consumable materials for modern high-temperature technology, but also functional materials necessary to realize high-temperature new technologies. About 70% of the refractory materials are used for iron and steel smelting, but compared with the international advanced level, the energy consumption per ton of steel for iron and steel smelting in my country is 20-40% higher, and the average consumption of refractory materials per ton of steel is 32Kg, while that of developed countries in the world is below 20Kg. The gap is large. [0003] In the process of iron and stee...

AI Technical Summary

Problems solved by technology

With the development of clean steel and variety steel smelting technology, the adoption of LF, VOD, VD, RH and other refining methods, due to the interaction of long-term high-temperature molten steel frequent erosion and vacuum alloy and refining slag corrosion, etc., resulting in the failure of refined ladles Significantly reduced service life

Therefore, refining ladle refractory materials not only consumes a lot of refractory materials per ton of steel, but also has a huge energy loss, which directly affects the temperature change of tapping and molten steel in the ladle, and the change of molten steel temperature has a great impact on the refining and casting process and the quality of the final product. make an impact

Moreover, the industrial refining ladle working lining is currently basically dense aluminum-magnesium refractory materials, and its main raw material is dense corundum aggregate, so the heat loss of the ladle is further increased

[0004] Traditional thermal insulation refractory materials have excellent thermal insulation effect, but their erosion resistance, strength and wear resistance are poor. Usually, they cannot be directly used as working surfaces, but as insulation layers or permanent layers.