As we have previously discussed, the factors that accelerate the formation of zinc ash can be used to identify methods to reduce its production.
(1) Add a certain amount of aluminum to the zinc liquid in the galvanizing pot, allowing aluminum to form a protective oxide film (Al₂O₃) on the surface of the zinc liquid. Experiments have shown that a protective film with a thickness of 10^-5 millimeters is sufficient to prevent the intrusion of oxygen.
(2) Reduce the contact area between the molten zinc and the air. Generally, galvanizing pots are designed with a small opening area and a large depth.
(3) Minimize the frequency of air exchange on the surface of the zinc liquid. Reduce the airflow of the dust collector and use other methods to improve environmental conditions.
(4) Operate the zinc liquid surface under a protective atmosphere. For example, in the "protective gas reduction method," part of the zinc liquid is enclosed within a hood.
(5) Reduce the frequency of scraping ash from the surface of the zinc liquid where galvanized steel tubes are not passing through.
(6) Cover the surface of the zinc liquid with activated carbon treated with boric acid or a mixture of diatomaceous earth and aluminum oxide.
(7) Lower the temperature of the galvanizing pot, subsequently reducing the temperature of the zinc liquid and minimizing the oxidation reaction between the zinc liquid surface and oxygen in the air.
(8) Prevent chemical elements that accelerate the formation of zinc ash from entering the zinc liquid.
