Method for removing bottom slag and dross in zinc pot

A technology of zinc pot and scum, applied in the direction of coating, metal material coating process, hot-dip galvanizing process, etc., can solve the problem of clear explanation of the principle of zinc slag removal, general effect of zinc slag removal, no mention of the temperature of the zinc solution, etc. question

Inactive Publication Date: 2019-12-20
SD STEEL RIZHAO CO LTD
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AI Technical Summary

Problems solved by technology

This invention has the following shortcoming: (1) this invention does not set forth clearly the principle of removing zinc slag; (2) the zinc liquid aluminum content mentioned in this invention is raised to 0.25~0.30% and is not enough to completely make the Fe in the zinc liquid Reaction forms zinc slag; (3) this invention does not mention strip steel is extracted out from zinc liquid, while Fe element constantly reacts to form zinc slag in zinc liquid, still has Fe element to be dissolved in zinc liquid constantly, removes The effect of zinc slag is general; (4) the invention does not mention the temperature of molten zinc

Method used

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  • Method for removing bottom slag and dross in zinc pot

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Effect test

Embodiment 1

[0018] For a hot-dip galvanizing production line, the size of the zinc pot used for hot-dip galvanizing is 4.1m (length) × 3.9m (width) × 2.5m (depth). The zinc pot is fixed, and the design process layout is as follows figure 1 .

[0019] (1) Utilize downtime maintenance time, the strip steel soaked in the zinc solution is extracted out, reduce the dissolving of Fe in the strip steel in the zinc solution; (2) the zinc solution aluminum content is brought up to 0.32%, the zinc solution aluminum content is by 0.18% was increased to 0.32%; (3) the temperature of the zinc solution was reduced to 448°C, and the temperature of the zinc solution was reduced from 462°C to 448°C. (4) The argon injection pipeline is arranged diagonally in the zinc pot, the diameter of the pipeline is 18mm, the depth is 4 / 5 of the depth of the zinc pot, and the argon injection pressure is controlled at 2bar. (5) Control the time of one diagonal spraying at 60 minutes, and then switch to the other side f...

Embodiment 2

[0021] For a hot-dip galvanizing production line, the size of the zinc pot used for hot-dip galvanizing is 4.1m (length) × 3.9m (width) × 2.5m (depth). The zinc pot is fixed, and the design process layout is as follows figure 1 .

[0022] (1) Utilize downtime maintenance time, the strip steel soaked in the zinc solution is extracted out, reduce the dissolving of Fe in the strip steel in the zinc solution; (2) the zinc solution aluminum content is brought up to 0.40%, the zinc solution aluminum content is by 0.24% is increased to 0.40%; (3) The temperature of the zinc solution is reduced to 452°C, and the temperature of the zinc solution is reduced from 458°C to 452°C. (4) The argon injection pipeline is arranged diagonally in the zinc pot, the diameter of the pipeline is 20mm, the depth is 4 / 5 of the depth of the zinc pot, and the argon injection pressure is controlled at 5bar. (5) Control the time of one diagonal spraying at 100 minutes, and then switch to the other side for...

Embodiment 3

[0024] For a hot-dip galvanizing production line, the size of the zinc pot used for hot-dip galvanizing is 4.1m (length) × 3.9m (width) × 2.5m (depth). The zinc pot is fixed, and the design process layout is as follows figure 1 .

[0025] (1) Utilize downtime maintenance time, the strip steel soaked in the zinc solution is extracted out, reduce the dissolving of Fe in the strip steel in the zinc solution; (2) the zinc solution aluminum content is brought up to 0.34%, the zinc solution aluminum content is by 0.20% is increased to 0.34%; (3) The temperature of the zinc solution is reduced to 450°C, and the temperature of the zinc solution is reduced from 460°C to 450°C. (4) The argon injection pipeline is arranged diagonally in the zinc pot, the diameter of the pipeline is 19mm, the depth is 4 / 5 of the depth of the zinc pot, and the argon injection pressure is controlled at 3bar. (5) Control the time of one diagonal spraying at 90 minutes, and then switch to the other side for ...

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Abstract

The invention relates to a method for removing bottom slag and dross in a zinc pot. According to the method, strip steel soaked in zinc liquid is extracted, and the dissolution of Fe in the strip steel in the zinc liquid is reduced; and the aluminum content is increased to 0.32-0.40%, the temperature of the zinc liquid is decreased to 450+/-2 DEG C, the solubility of iron in the zinc liquid is reduced, blowing is carried out on the bottom of the zinc pot by using argon, the zinc liquid is stirred and circulated, the bottom slag fully reacts with the dross to form surface slag, then the floating surface slag is timely removed by using a slag fishing ladle, at the moment, the Fe content in the zinc liquid can be practically controlled to be very low and is generally 0.004%-0.008%, the usageamount of transitional materials in the production process is decreased, the production period of a panel is prolonged, the bottom slag and the dross in the zinc pot can be removed, the iron content of the zinc liquid is decreased, and the requirements of high strength and high surface in industries such as automobiles are met.

Description

technical field [0001] The invention belongs to the technical field of metal surface anticorrosion treatment, in particular to a method for quickly removing bottom slag and scum in a zinc pot. Background technique [0002] The total aluminum content of the traditional galvanizing process is generally controlled at about 0.18-0.24%. The iron powder remaining on the surface of the steel plate and the iron in the strip steel continue to dissolve into the zinc liquid, so that the iron content in the zinc liquid continues to rise. The iron content is generally 0.008-0.020 %, the dissolution of iron in the zinc solution has a certain degree of saturation, so when the concentration of iron in the zinc solution exceeds the saturation, it will precipitate to form a metal compound (zinc slag), and the zinc slag is mainly composed of FeZn 7 , FeZn 13 , Fe 2 al 5 The zinc liquid is in a dynamic equilibrium process of iron dissolution and zinc dross precipitation. Both iron dissolutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/26C23C2/40
CPCC23C2/06C23C2/26C23C2/40
Inventor 胡华东李洪翠亢业峰王乐梁亚王鹏陈庆军查凯刘闯董立华
Owner SD STEEL RIZHAO CO LTD
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