Zinc-aluminum-rare earth middle alloy and its use in hot galvanizing alloy production

Abstract

The invention relates to a process for producing a hot dip galvanizing alloy and an interalloy thereof. The technical proposal comprises that the interalloy of zinc, aluminum and rare earth consists of the following components in mass percentage: 3 to 5 percent of Al, 6 to 10 percent of RE, and the balance being Zn. The method of producing the hot dip galvanizing alloy comprises the following steps: mixing the zinc, the aluminum and the rare earth according to the following weight ratio: 3 to 5 percent of the Al, 6 to 10 percent of the RE, and the balance being the Zn; melting the materials in an interalloy smelting furnace with smelting temperature of between 500 and 650 DEG C; stirring the materials evenly and casting the materials into the interalloy of the zinc, the aluminum and the rare earth; adding the solid zinc required for the production of the hot dip galvanizing alloy into the smelting furnace made from the hot dip galvanizing alloy to be melted into zinc liquid; adding a slag former to the zinc liquid, stirring the mixture and forming slag at a temperature of between 470 and 480 DEG C; removing the slag in the furnace; adding the alloy of the zinc, the aluminum and the rare earth required according to the mixture ratio of the produced hot dip galvanizing alloy to the zinc liquid; and stirring the mixture to obtain the hot dip galvanizing alloy. The process reduces the temperature for alloy smelting, shortens the smelting and stirring time, prolongs the service life of a core-type induction furnace and is advantageous to uniform the components of the hot dip galvanizing alloy, and has the advantages of low equipment cost and simple and convenient maintenance.

Description

technical field [0001] The invention relates to an alloy and a production process of the alloy. In particular, it relates to a production process of a hot-dip galvanized alloy. Background technique [0002] The smelting industry has always been an industry with high resource consumption, and the energy saving problem of alloy smelting is particularly prominent. Alloy smelting is generally produced by reverberatory furnaces or induction furnaces that burn gas and heavy oil. Among them, induction furnaces are commonly used smelting equipment. Therefore, induction furnaces The issue of energy saving is particularly important. Hot-dip galvanized alloys generally need to add other elements to the zinc liquid, such as adding aluminum, rare earth, etc. The melting point of these added elements may be higher than that of zinc. In order to melt these substances, the melting temperature needs to be increased, which will inevitably increase energy consumption. . For example, the cur...

AI Technical Summary

Problems solved by technology

For example, the current production method of zinc-aluminum rare earth hot-dip galvanized alloy is to directly add solid aluminum and rare earth to the zinc liquid after melting the zinc, so that the solid aluminum and rare earth can be melted in the zinc liquid. Due to the density of solid aluminum: 2.7g / cm 3 , melting point 660.4°C, boiling point 2467°C; density of rare earth La 6.174g / cm 3 , melting point 921°C, boiling point 3457°C; density of rare earth Ce 8.24g / cm 3 , with a melting point of 799°C and a boiling point of 3426°C; while the density of zinc as a solid is 7.14g / cm at 298K 3 , 6.62g / cm when the liquid is 692K 3 , with a melting point of 419.7°C and a boiling point of 907°C; the melting points of the above metals are higher than that of zinc, so this zinc-aluminum rare earth alloy requires a relatively high melting temperature, generally at a temperature above 550°C, resulting in the energy consumption of zinc alloy smelting raised

And limited by equipment selection, for example, the melting temperature of a cored induction furnace is generally between 500 ° C and 520 ° C. If the temperature is too high, the service life of the equipment will be reduced, but the temperature that this type of equipment can provide can only melt zinc. Instead of melting aluminum, it cannot meet the requirements of the process

On the other hand, in this method of directly adding solid aluminum and rare earth, it is necessary to stir the zinc liquid for a long time after adding solid aluminum and rare earth, so that the aluminum element can be evenly distributed in the zinc alloy. , will inevitably increase the production cost, and it is difficult to achieve the desired effect, and it is easy to cause component segregation due to uneven mixing, which affects the quality of the alloy ingot

[0003] To sum up, in industrial production, the method of directly adding aluminum and rare earth is one of the reasons for the high energy consumption of hot-dip galvanized alloys. To meet its process requirements, the production method of hot-dip galvanized alloy needs to be further improved