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Treatment method for purifying zinc pot in hot galvanizing production

A purification treatment and hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve problems such as excessive Fe content in zinc pot, slag belt defects, and zinc slag adhered to the surface of the strip steel , to achieve the effect of improving quality, improving purity, improving adhesion and gloss of zinc layer

Active Publication Date: 2014-02-12
HEBEI IRON AND STEEL
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AI Technical Summary

Problems solved by technology

Since the hot-dip galvanizing production line itself is not equipped with a cleaning section, the Fe content in the zinc pot often exceeds the standard, and a large amount of zinc slag often adheres to the surface of the strip, and in severe cases, a slag band defect is formed

Method used

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  • Treatment method for purifying zinc pot in hot galvanizing production
  • Treatment method for purifying zinc pot in hot galvanizing production

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Embodiment Construction

[0015] The purification treatment method of the zinc pot in the hot-dip galvanizing production is illustrated by taking the 2# galvanizing line of a cold rolling plant in Hebei as an example. Since the production line itself is not equipped with a cleaning section, the Fe content in the zinc pot often exceeds the standard, and the surface of the strip often A large amount of zinc slag is adhered, and in severe cases, slag belt defects are formed. Using this purification treatment method, the zinc pot purification treatment is carried out every other week (7 days). The specific operation process is as follows:

[0016] 1) Increase the aluminum content to 0.25-0.3%, and the staff on duty will increase the number of samples sent to 5-7 times to control the aluminum content in the zinc pot; maintain at least one shift production time (8-12h).

[0017] 2) figure 1 As shown, utilize the high-pressure nitrogen cylinder and the blowing pipeline 2 that is arranged in the zinc pot 1, n...

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Abstract

The invention discloses a treatment method for purifying a zinc pot in hot galvanizing production. A purification treatment process comprises the steps that hot galvanizing production is carried out while aluminium content of molten zinc is maintained to be 0.025-0.030wt% and scummings in the zinc pot are cleaned in a hot galvanizing production process. The treatment method for purifying the zinc pot in the hot galvanizing production has the advantages that generation of iron in the zinc pot is inhibited by increasing the aluminium content in the molten zinc from 0.18-0.20% at ordinary times to 0.025-0.030%, so as to improve zinc layer adhesiveness and glossiness of a galvanized plate, and quality of the galvanized plate is effectively improved; iron content in the zinc pot after being purified by adopting the treatment method is obviously reduced, and thus a foundation is laid for follow-up generation.

Description

technical field [0001] The invention relates to a galvanizing technology, in particular to a method for purifying zinc pots in hot-dip galvanizing production. Background technique [0002] As hot-dip galvanized products are widely used in construction, light industry, household appliances and automobile industries, people have stricter requirements on the surface quality of hot-dip galvanized sheets. Hot-dip galvanizing generally adopts a device with a structure of three rolls, six arms, and a furnace nose, which is composed of a zinc pot, a furnace nose, a sinking roll, a front stabilizing roll, a rear stabilizing roll, an air knife and its adjustment device; its working process is: the steel strip is passed through The furnace nose enters the zinc liquid in the zinc pot for immersion plating, and then goes out of the zinc pot after bypassing the sinking roll, and then enters the alloying furnace or cooling stage through the front and rear stabilizing rolls and air knife. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06
Inventor 孙力刘大亮李一栋于世川谭文振张洪波刘小川王迎春
Owner HEBEI IRON AND STEEL
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