| 摘要 |
Precise information about the position of a liquid-liquid interface (28, 32) is often important for the control and automation of molten metal refining processes. For example, in an electrolytic process for removing magnesium from molten aluminum, knowledge of the vertical position of an interface (32) between the electrolyte and the magnesium and an interface (28) between the electrolyte and the aluminum facilitates the automatic removal of the purified metals. Differences in surface tension in the fluid layers of a molten electrolytic salt (30) and a molten metal (29) produce different pressures as bubbles (57) evolved from vertically displaced tips (52) of tubes (34, 36) press against the liquid layers on either side of their interfaces (28, 32). These different pressures are detected by a differential pressure transducer (42) to limit the amount of purified molten aluminum from molten aluminum-magnesium scrap, when drawn through a port (26) in a reaction furnace (10) without risk of also contaminating the purified aluminum with the electrolyte (30) above the interface.
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