Dispersion corundum-spinel air brick and preparation method thereof

Abstract

The invention relates to a dispersion corundum-spinel air brick and a preparation method thereof. According to the technical scheme of the dispersion corundum-spinel air brick, the dispersion corundum-spinel air brick is composed of 60-70 wt% of densely sintered corundum particles or electrically melted white corundum particles, 25-35 wt% of densely sintered corundum fine powder or electrically melted white corundum fine powder and 2-7 wt% of magnesia micro powder or chrome oxide micro powder. The raw materials are mixed, a binding agent, polycarboxylate and water are added, and castable is obtained through stirring; a polymeric sponge is fixed to the bottom of an air brick mold, the castable is added for vibration forming, curing and demolding are conducted, and an air brick blank is obtained; the air brick blank is placed in a high-temperature furnace, subjected to heat preservation for 1-3 h at 600-800 DEG C and subjected to heat preservation for 3-5 h at 1500-1700 DEG C; and the air brick blank is cooled to the room temperature with the furnace, and the dispersion corundum-spinel air brick is obtained. The dispersion corundum-spinel air brick and the preparation method thereof have the characteristics of simple process and low cost, and the prepared dispersion corundum-spinel air brick is even in through hole distribution, good in integrality, high in strength and good in thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of air-permeable bricks. In particular, it relates to a diffused corundum-spinel air brick and a preparation method thereof. Background technique [0002] With the advancement of clean steel smelting technology, especially the increase in the amount of smelting steel varieties, the proportion of out-of-furnace refining in the smelting process is increasing. As an important gas supply element in the refining process outside the furnace, the breathable brick plays a vital role in homogenizing the temperature of molten steel and removing inclusions, and is the key to improving the quality of high-quality steel. Among them, the size and distribution range of the bubble groups generated by the inert gas passing through the permeable brick directly affect the stirring and impurity removal effects of molten steel. Dispersed corundum-spinel permeable brick is used as a gas supply element for ladle bottom blowing g...

AI Technical Summary

Problems solved by technology

However, in the preparation process of dispersed corundum-spinel permeable bricks, non-close packing of particles is usually used to realize diffuse through holes, resulting in poor bonding performance between particles inside the material, which seriously reduces the overall strength and heat resistance of permeable bricks. Shock performance

[0003] In order to solve the problems of poor strength and thermal shock resistance of the dispersed corundum-spinel breathable brick, the patented technology of "a composite breathable brick" (CN201620177U) discloses a machine-pressed dispersion breathable brick with the upper part and a lower part It is a non-dispersive composite breathable brick

Although the breathable bricks prepared by this method can form a large number of small-diameter bubble groups, the physical splicing of the two structures makes the integrity of the breathable bricks poor, and it is easy to cause molten steel to penetrate into the breathable bricks, affecting the performance of the breathable bricks. Airflow and service life