G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 25/20 (2006.01) C25C 3/04 (2006.01) C25C 7/06 (2006.01) F27D 21/00 (2006.01) G01F 23/22 (2006.01) G01F 23/24 (2006.01)
Patent
CA 2115389
METHOD AND APPARATUS FOR DETECTING THE POSITION OF FLUID-FLUID INTERFACES ABSTRACT OF THE DISCLOSURE Precise information is obtainable concerning the position of a fluid-fluid interface (28, 33), such as between a gas and a liquid or between liquids. Such information is important for the control and automation of molten metal refining processes. Specifically, in an electrolytic process for removing magnesium from molten aluminum, knowledge of the vertical position of an interface (33) between the electrolyte and the magnesium and an interface (28) between the electrolyte and the aluminum facilitates the automatic removal of the purified metals when drained or drawn from the furnace. Heat energy is conducted through a thermocouple-heater assembly 34 to a thermocouple (38) located at its tip (36). The equilibrium temperature at the thermocouple junction is dependent upon the heat loss through tip (36). When the tip comes in contact with a fluid of different thermal conduc- tivity, as between molten matter (29) and electrolyte (30), the equilibrium temperature at tip (36) and, thus, of the thermocouple junction will change. This change in temperature is used to determine the level of the liquid-liquid interface between molten matter (29) and electrolyte (30). This information is used to determine when the drawing of further molten material from the furnace is to be terminated, so that aluminum purified in the refining process and previously drawn through an outlet (26) will not be contaminated.
Hughes Aircraft Company
Sim & Mcburney
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