Preparation method for isostatic pressure calcium-aluminum-silicon tin bath bottom brick

Abstract

Disclosed are a tin bath bottom brick and a method for preparing the same, the tin bath bottom brick consisting, in weight percent, of: Al2O3 66%-80%, CaO 17%-28%, SiO2 1.5%-5%, and the balance being common mineral impurities. The method comprises: formulating, isostatic pressing and firing at a high temperature, the weight percentages for the formulation being 30%-45% of calcium aluminate coarse particles with a particle size of 3-1 mm, 20%-35% of calcium aluminate medium particles with a particle size of 1-0.1 mm, and 25-40% of fine binding powder with a particle size less than 0.088 mm. The product has a good corrosion resistance to alkali metal oxides, a low thermal expansion, a low thermal conductivity and a low hydrogen diffusion rate.

Description

technical field [0001] The invention relates to a tin bath bottom brick and a manufacturing method thereof, belonging to the technical field of refractory materials. technical background [0002] The tin bath is the key equipment of the float flat glass production line. The molten glass flows into the tin bath, floats on the tin bath, and forms smooth plate glass while advancing. The refractory brick used to store the tin bath is called the tin bath. Bottom brick. Most of the clay bricks currently used in the market are silica-alumina clay bricks. During their use, the Na2O contained in the glass slowly penetrates into the bricks through the tin liquid, forming nepheline and producing volume expansion and thermal stress. When the metamorphic layer containing nepheline increases to a certain thickness, the metamorphic layer will flake off in the form of flakes. Since its specific gravity is lower than that of tin liquid, when the peeled fragments float to the surface of tin ...

AI Technical Summary

Problems solved by technology

The disadvantage of this brick is that the coarse particles and fine particles are combined by hydrates. After heat treatment at 1100°C, the calcium aluminate bonded phase still contains a small amount of bound water. During use at temperatures above 1100°C, the bound water will overflow. The porosity of the product will also increase, which will lead to risks in use

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