A method for removing zinc dross in hot-dip galvanizing bath

A hot-dip galvanizing and zinc slag technology, applied in hot-dip galvanizing process, coating, metal material coating process and other directions, can solve problems such as poor effect, and achieve the effect of low cost, reducing zinc slag and easy adsorption

Active Publication Date: 2020-01-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of the large bubbles generated by the micropores, if it is used to remove zinc slag in the hot-dip galvanizing solution, the effect is not good, and the blowing head needs to be re-improved so that the bubbles generated can better remove the zinc slag in the zinc solution. Zinc dross

Method used

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  • A method for removing zinc dross in hot-dip galvanizing bath
  • A method for removing zinc dross in hot-dip galvanizing bath
  • A method for removing zinc dross in hot-dip galvanizing bath

Examples

Experimental program
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Effect test

Embodiment 1

[0034] For a hot-dip galvanizing process production line, the size of the zinc pot used for hot-dip galvanizing is 15m (length) × 2.5m (width) × 3m (depth), and the temperature of the zinc bath is 450°C. The original zinc liquid sample before purification in the zinc pot is taken and cooled rapidly after pouring, and its microstructure is as follows: Figure 4 As shown, it can be seen that there is more zinc slag in the zinc solution.

[0035] The porous blowing head is prepared by mixing red mud metallurgical residue with a particle size of 100 mesh and 30 mesh with an appropriate amount of silica sol at a mass ratio of 1:1, and then sintering. The placement of the porous blowing head in the zinc liquid adopts image 3 Side-by-side multi-hole blowing heads shown, the shape of the multi-hole blowing head is hemispherical ( figure 2 shown). Turn on the porous blowing head purification device ( figure 1After the nitrogen flow control system (shown), place the side-by-side p...

Embodiment 2

[0037] For a hot-dip galvanizing process production line, the size of the zinc pot used for hot-dip galvanizing is 15m (length) × 2.5m (width) × 3m (depth), and the temperature of the zinc bath is 450°C. In order to better purify the zinc slag in the plating solution, 0.2wt% manganese was added to the plating solution in the form of zinc-5wt% manganese master alloy. Image 6 It is the morphology map of the zinc slag inside the zinc liquid after adding 0.2wt% manganese, compared with Figure 4 and Image 6 , it can be clearly seen that the average particle size of zinc dross inside the zinc bath becomes smaller after adding Mn, and the addition of trace manganese can reduce the aggregation of zinc dross in the bath. Reducing the size of zinc dross particle clusters makes it easier for air bubbles to adsorb zinc dross.

[0038] The preparation of the porous blowing head is made of red mud metallurgical residue with a particle size of 100 mesh and 30 mesh in a mass ratio of 1:3...

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Abstract

The invention relates to a method for removing zinc slag in hot dipping zinc liquid. According to the method, firstly, trace manganese is added into zinc liquid; the gathering of zinc slag particles in the zinc liquid can be reduced, so that the dimension of the zinc slag particle clusters is reduced; then, a porous blowing head connected with a high-pressure nitrogen gas tank is arranged inside the zinc liquid; nitrogen gas forms fine and uniform bubbles in plating liquid after passing through the porous blowing head; by using the adsorption effect of bubbles on suspended zinc slag in the plating liquid, in the bubble floating process, the zinc slag suspended inside the plating liquid is brought to the surface, so that suspended zinc slag inside the zinc liquid is removed. By the method, floating slag in the zinc liquid can be effectively removed; the surface quality of a plating layer can be improved. The method has the advantages that simplicity and convenience are realized; the cost is low; the environment is not polluted; the method is applicable to suspended zinc slag generated by a solvent method hot dipping zinc plating process.

Description

technical field [0001] The invention relates to a purification technology for a hot-dip galvanizing solution, in particular to a method for removing zinc slag in a hot-dip galvanizing solution. Background technique [0002] In the anti-corrosion technology of steel materials, hot-dip galvanizing technology is a common and effective method. Due to its good protection and low cost, it is widely used in electric power, transportation, automobile, construction, chemical and other industries. The surface quality of the coating will affect its corrosion protection to steel. Production practice shows that a coating with excellent performance must be guaranteed by a plating solution with excellent metallurgical quality. Under actual working conditions, some iron will diffuse into the plating solution during hot-dip plating of steel. For example, at a dipping temperature of about 450°C, the saturation solubility of iron in the plating solution is only about 0.05wt%, and excess iron ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C23C2/06C22B9/05C22B19/32
CPCC22B9/05C22B19/32C23C2/003C23C2/06
Inventor曾建民王友彬罗龚罗立张锐
OwnerGUANGXI UNIV