Production method of float glass

Abstract

The invention provides a production method of float glass. The method comprises the following steps: melting glass to obtain molten glass; adding a tin bath additive to molten tin at a tin bath constriction section at 650-750 DEG C; adding the molten glass to the tin bath to obtain a glass tape; and annealing the glass tape to obtain the float glass, wherein the tin bath additive is an iron-tin monotectic or hypomonotectic alloy with the mass percentage content of tin of 18-48.8% and the melting point of 1130-1400DEG C. The melting point of tin is lower than that of iron, the addition of a proper amount of tin makes the tin bath additive have a low melting point, and the temperature of the molten tin does not violently decrease when the tin bath additive is added to the molten tin in the tin bath, so bubbles are avoided. A ratio of tin to iron is proper, so after the tin bath additive is added to the molten tin, local enrichment of iron is unlikely, and bubbles can also be avoided. The use of the tin bath additive in the invention is helpful to obtain the high-quality float glass with few bubbles and small tin permeability.

Description

technical field [0001] The invention relates to the field of float glass production, in particular to a production method of float glass. Background technique [0002] The production process of float glass is as follows: the molten glass is continuously flowed from the tank kiln and floated on the surface of the relatively dense tin liquid, and under the action of gravity and surface tension, the glass liquid is spread on the surface of the tin liquid, Flatten to form a glass ribbon with flat and hardened upper and lower surfaces, pull the glass ribbon out of the tin bath, anneal and cut to obtain float glass products. [0003] In the above-mentioned float glass production process, the tin bath is a container for storing molten tin, and its function is to form glass with a certain thickness and width by external force at a certain temperature with the molten glass. [0004] After the tin liquid in the tin bath is oxidized by oxygen, the generated tin monoxide easily penetra...

AI Technical Summary

Problems solved by technology

Among them, the iron used must be pure iron. Pure iron melts and absorbs heat, which will cause the tin liquid to cool down too quickly, and the iron will also bring a small amount of iron oxide impurities, and adding iron directly into the tin bath will also cause the local concentration of iron to be too high. The existence of these factors makes the float glass prone to air bubbles

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