Preparation method for microporous light-weight corundum fireproof aggregate

Abstract

The invention relates to a microporous light-weight corundum fireproof aggregate and a preparation method thereof. According to a technical scheme in the invention, 55 to 100 wt% of industrial alumina fine powder and 0 to 45 wt% of industrial aluminum hydroxide fine powder or alpha-Al2O3 micro powder are used as raw materials, and the raw materials undergo dry grinding on a ball mill for 0.5 to 3 h at first, then balling in a ball forming mill to obtain a ball blank with a size of 20 to 30 mm and finally rapid sintering in a shaft kiln at a temperature of 1700 to 1950 DEG C so as to obtain the microporous light-weight corundum fireproof aggregate. The preparation method for the microporous light-weight corundum fireproof aggregate is simple and easy and is applicable to volume industrial production; the microporous light-weight corundum fireproof aggregate has the advantages of a small bore diameter, high strength, low thermal conductivity, anti-scouring performance, erosion resistance and the like, can be used in a part where the wall of a steel ladle directly contacts with molten steel, is also applicable to production of iron runners, slide plates, ventilating bricks and the like and to other industrial kilns used in petrochemistry, ceramics and the like and can obviously 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.