Low-porosity chrome corundum brick and preparation method thereof

Abstract

The invention discloses a low-porosity chrome corundum brick and a preparation method thereof. The low-porosity chrome corundum brick is prepared from the following raw materials in percentage by mass: 18-28 percent of corundum with the raw material granularity being 5-3mm, 30-40 percent of corundum with the raw material granularity being 3-1mm, 10-20 percent of corundum with the raw material granularity being 1-0mm, 10-20 percent of corundum with the raw material granularity being smaller than 0.088mm, 1-15 percent of high-content chromium ore or fused chrome oxide with the raw material granularity being 1-0mm and 2-15 percent of high-purity chromium oxide with the raw material granularity being smaller than 0.088mm; and in addition, a phosphate binder accounting 2-5 percent for the total mass of all the raw materials is added. According to the low-porosity chrome corundum brick and the preparation method, a product is prepared by material mixing, forming, sintering, impregnating with a nanometer oxide suspension and microwave drying according to burdening of the low-porosity chrome corundum brick, can lower the apparent porosity and the porosity aperture of a chrome corundum material, and reacts with permeated molten slag to form a high melting point substance, increases the viscosity of the molten slag, and slows down permeation of the molten slag.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to low-porosity chromium corundum bricks such as chromium corundum bricks used in the field of nonferrous smelting and a preparation method thereof. Background technique [0002] During the non-ferrous smelting process, the furnace lining material is subjected to high temperature and erosion of liquid slag at the same time. Although the melting temperature of the molten slag encountered is much lower than that encountered by the steel industry, the slag has low viscosity, good fluidity, strong permeability, and serious erosion of lining materials. Chrome corundum bricks are mainly composed of Al 2 o 3 and Cr 2 o 3 Composed of two components, it is characterized by high load softening temperature, good wear resistance, and can resist high-temperature air erosion; strong chemical stability, and strong resistance to neutral to weakly acidic slag. It has been widely us...