| 摘要 |
A device limits the oxidation of the surface of hot metallic dross by preventing access of oxygen to the dross. The device includes a metal bell which is open at the bottom and can be moved vertically, a concrete base standing in a tank containing water and a shallow container for holding the dross. The bell includes a number of metallic supports projecting from its lower edge to support the bell as it rests in the water filled tank. This arrangement provides an air-tight seal for the space inside the bell and allows for compensation of any pressure change inside the bell as the hot dross consumes the limited amount of oxygen in the air
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