Method for dredging bottom slag in 55% Al-Zn liquid

Abstract

The present invention relates to a method for dredging bottom slag in 55% Al-Zn liquid. The method comprises the following steps: 1) hanging out a sank roller furnace nose zinc pot equipment, and taking out of the strip steel; 2) cooling an aluminum-zinc liquid in a zinc pot from 600 + / - 3 DEG C to 591 DEG C at a rate of 5 DEG C / h; 3) after slag dredging, rising the temperature of the aluminum-zinc liquid from 591 DEG C to 785 DEG C at an average heating rate of 40 DEG C / h; 4) reducing the temperature of aluminum-zinc liquid from 785 DEG C to 650 DEG C at an average cooling rate of 13 DEG C / h; 5) rising the temperature of the aluminum-zinc liquid to 785 DEG C at an average rate of 35 DEG C / h; 6) reducing the temperature of the aluminum-zinc liquid from 785 DEG C to 645 DEG C at an average cooling rate of 10 DEG C / h; 7) repeating the steps 5) and 6) according to data obtained from exploration slag; 8) cooling at an average rate of 15-20 DEG C / h, and 9) raising the temperature of the aluminum-zinc liquid to 600 + / - 3 DEG C with 80% of zinc the pot power, and naturally cooling to 590 DEG C; and repeating this process 3-5 times, wherein the number of times can be increased depending on the circumstances of dredging.

Description

technical field [0001] The invention relates to a method for picking up liquid zinc slag, in particular to a method for picking up 55% aluminum-zinc liquid bottom slag, and belongs to the technical field of hot-dip galvanizing. Background technique [0002] Hot-dip aluminum-zinc is a new product developed on the basis of hot-dip galvanized products. Its good anti-rust ability has been welcomed by the market. The ratio of aluminum-zinc solution of 55% aluminum-43.5% zinc-1.5% silicon It is the most widely used one at present. However, this kind of ratio will produce a variety of zinc-iron compounds in the production. Since its density is higher than that of the aluminum-zinc liquid, it will precipitate at the bottom of the zinc pot. Over time, the zinc The iron compound will become thicker and thicker, so that it will touch the sinking roller, resulting in the failure of production. In actual production, in order to prevent the increase of bottom dross, every time a sinking r...

AI Technical Summary

Problems solved by technology

[0002] Hot-dip aluminum-zinc is a new product developed on the basis of hot-dip galvanized products. Its good anti-rust ability has been welcomed by the market. The ratio of aluminum-zinc solution of 55% aluminum-43.5% zinc-1.5% silicon It is the most widely used one at present. However, this kind of ratio will produce a variety of zinc-iron compounds in the production. Since its density is higher than that of the aluminum-zinc liquid, it will precipitate at the bottom of the zinc pot. Over time, the zinc The iron compound will become thicker and thicker, so that it will touch the sinking roller, resulting in the failure of production. In actual production, in order to prevent the increase of bottom dross, every time a sinking roller cycle occurs, generally about 8 days, the bottom dross needs to be cleaned. Clean up and carry out slag removal operations. However, in the fishing process, often only a small amount of bottom slag can be fished out, and a large amount of bottom slag forms a piece on the bottom plate of the pot. The main component of the bottom slag is FeZn7, with high hardness, HD=454, plastic OK, make the slag grab bucket unable to grab

The use of tools such as steel brazing has little effect on breaking it. Excessive force will cause damage to the body of the zinc pot to varying degrees, and there are great safety hazards for the staff during the operation.

Those skilled in the art are also constantly trying new methods, but this problem has not been well resolved

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