Horizontal continuous casting graphite crystallizer by aid of nitrogen protection method

Abstract

The invention discloses a horizontal continuous casting graphite crystallizer by the aid of a nitrogen protection method, and belongs to the technical field of metallurgical equipment. The horizontal continuous casting graphite crystallizer is used for copper continuous casting equipment and comprises a tubular graphite sleeve, a crystallizing cavity is formed inside the graphite sleeve, an annular groove is milled at the lower end of the graphite sleeve, through holes which are communicated with the crystallizing cavity are drilled on the annular groove, a communicating hole is drilled at the bottom of the graphite sleeve and communicated with the through holes, and a capillary tube is further disposed in the communicating hole and connected to an external nitrogen tube. After the structure is adopted, oxidation of the graphite crystallizer is effectively stopped, and the service life of the graphite crystallizer is prolonged. Besides, air behind a crystallization point of the graphite crystallizer is isolated by nitrogen, a copper billet is effectively prevented from contacting with the air when in crystallization, oxidation of a tube billet is prevented, and accordingly problems that an existing graphite crystallizer is short in service life, the surface of a copper billet is oxidized and has severe convex marks and a copper crystallization effect is poor are solved.

Description

technical field [0001] The invention relates to a nitrogen protection method horizontal continuous casting graphite crystallizer used in copper continuous casting equipment, belonging to the technical field of metallurgical equipment. Background technique [0002] At present, the graphite crystallizer commonly used in copper horizontal continuous casting equipment has a very short life, and the copper liquid is cooled and crystallized in the graphite crystallizer without any protection. Since the temperature of liquid copper crystallization is about 1150-1165 °C in a high temperature environment, the oxidation of graphite crystallizer is serious; after the surface of graphite is oxidized at high temperature, the surface hardness will decrease accordingly, and at the same time, liquid copper will change from liquid to solid after crystallization. During the pulling process, the inner wall of the graphite crystallizer is directly rubbed, causing scratches on the inner wall of ...

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Problems solved by technology

[0002] At present, the graphite crystallizer commonly used in copper horizontal continuous casting equipment has a very short life, and the copper liquid is cooled and crystallized in the graphite crystallizer without any protection

Because the copper liquid crystallization temperature is about 1150-1165 °C in a high temperature environment, the oxidation of the graphite crystallizer is serious; after the graphite surface is oxidized at high temperature, the surface hardness will decrease, and at the same time, the copper liquid will change from liquid to solid after crystallization. During the pulling process, the inner wall of the graphite crystallizer is directly rubbed, causing scratches on the inner wall of the graphite crystallizer in a short period of time, and the scratches on the inner wall of the graphite crystallizer cause convex marks on the surface of the subsequent crystallized copper billet, and the convex marks increase the scratches on the inner wall of the graphite crystallization Injury, so a vicious circle occurs, which greatly shortens the service life of the graphite crystallizer, so the life of the graphite crystallizer used in the current level of continuous casting is relatively short, generally about 2-3 days

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