As we have previously discussed, factors that accelerate the formation of zinc ash are known. Therefore, based on this understanding, we can identify methods to reduce its production.
(1) Add a certain amount of aluminum to the molten zinc in the galvanizing pot to form a protective alumina (Al₂O₃) film on the surface of the molten zinc. Experiments have shown that a protective film with a thickness of 10^-5 millimeters is sufficient to prevent oxygen intrusion.
(2) Reduce the contact area between the molten metallic zinc and the air. Typically, 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 molten zinc. Reduce the airflow of dust collectors and use other methods to improve environmental conditions.
(4) Operate the molten zinc surface under a protective atmosphere. For example, in the "protective gas reduction method," part of the molten zinc is enclosed within a hood.
(5) Reduce the frequency of scraping ash on the surface of the molten zinc where galvanized steel pipes are not passing through.
(6) Cover the surface of the molten zinc with activated carbon treated with boric acid or a mixture of diatomaceous earth and alumina.
(7) Lower the temperature of the galvanizing pot, which will subsequently reduce the temperature of the molten zinc, thereby decreasing the oxidation reaction between the surface of the molten zinc and oxygen in the air.
(8) Prevent chemical elements that accelerate the formation of zinc ash from entering the molten zinc.
