Light weight microporous corundum aggregate and preparation method thereof

Abstract

The invention discloses light weight microporous corundum aggregate and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing components of raw materials and balling, wherein the balling water addition is 5-30%; and then, insulating for 0.5-6 hours at 1600-1950 DEG C to obtain the light weight microporous corundum aggregate. The raw materials comprise the following components in parts by weight: 55-99 parts of industrial aluminum oxide fine powder, 0-30 parts of p-Al2O3 micropowder and 1-20% of aluminum micropowder. The light weight microporous corundum aggregate provided by the invention is simple in preparation method, low in apparent porosity, lower than sintered plate corundum in volume density and high in refractoriness.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials, and particularly relates to a lightweight microporous corundum aggregate and a preparation method thereof. Background technique [0002] With the continuous progress of iron and steel smelting technology, especially the smelting of some high-quality steel grades, higher requirements are placed on the purity of refractory materials for smelting furnaces. [0003] The ladle is an important steel container in the steelmaking process. At present, most of the refractory materials used for the ladle wall in the molten pool of the domestic ladle are carbon-free prefabricated blocks or castables. The main raw materials used are sintered tabular corundum, fused white corundum and brown corundum. Corundum. [0004] Because of the high purity of sintered tabular corundum, good thermal shock stability and mature production technology, its usage is also the largest. As the iron and ste...

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Problems solved by technology

[0006] The disadvantages of this method are: 1) The amount of water added in the wet grinding process is large, and the energy consumption in the later drying process is very large; 2) The size and number of pores inside the material are uncontrollable

[0008] The disadvantages of this method are: 1) The purity is low, and substances such as sillimanite and sintering accelerator are added. If it is used as a working lining refractory, the anti-erosion effect is poor and the service life is short; 2) The pores are introduced in the form of adding foam , so that the apparent porosity of the obtained material is too high, and the corrosion resistance and permeability of molten steel and steel slag are poor

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