Refractory castable of nanocomposite oxide ceramic combining alumina-spinelle and preparation method thereof

Abstract

The invention relates to a nanometer composite oxide ceramics binding aluminium-spinel fireproof casting material and a manufacturing method thereof. The composition of ingredients thereof is that various grades of special-class bauxite clinker, brown fused alumina, secondary white fused alumina, white fused alumina and aluminum-magnesium spinel are adopted as skeletal material; and the base material comprises plate-shaped corundum powder, calcinatory alpha-Al2O3 powder, active Al2O3 powder, aluminum-magnesium spinel powder, pure calcium aluminate cement, nanometer Al2O3-MgO composite ceramics binding agent hydrate colloid suspension bonding agent as well as various addition agents. The ingredients are mixed and stirred for making the nanometer Al2O3-MgO composite ceramics binding aluminium-spinel fireproof casting material. The fireproof casting material of the invention has excellent microstructure and mechanics performance, and also has the performances such as special slag corrosion resistance, stability of high temperature structure and high temperature resistance, and the like, is used in the entirely casting LF finery, and the service life thereof is prolonged obviously, and the development demands for effective operation of secondary refining equipment, thus providing the best service for the steal industry.

Description

technical field [0001] The invention belongs to a refractory castable for secondary refining of steel ladles, in particular to a nanocomposite oxide ceramic bonded aluminum-spinel refractory castable that uses nanocomposite oxide ceramics as a binder and can form a nanostructure matrix . Background technique [0002] The development trend of modern steelmaking production is that the proportion of continuous casting is increasing, and the refining technology outside the furnace is widely used to reduce inclusions in steel, increase special varieties of steel, and improve the quality of variety steel. Therefore, the function of the ladle has changed significantly, from a container for molten steel to a new smelting process equipment. Due to the increase of refining temperature, the residence time of molten steel is prolonged, the addition of alloy elements and slagging for refining, and the blowing of argon from the bottom of the ladle for strong stirring lead to worsening co...

AI Technical Summary

Problems solved by technology

However, with the increase of refined steel types, the application of secondary refined steel is becoming more and more common. This type of castable which is widely used at present still has some defects in its performance, such as aluminum-magnesium castables for body cladding. The chemical erosion and structural spalling damage of the castable due to poor slag permeability; the cracks and spalling damage of the aluminum-spinel castable for the furnace bottom due to thermal shock resistance not meeting the requirements are the main reasons that seriously affect the service life of the refining ladle , so in terms of materials, it still shows that the service life of the ladle does not match the development requirements of refining technology

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