Eliquation
El`i`qua´tion
n. 1. (Metallurgy) The process of separating a fusible substance from one less fusible, by means of a degree of heat sufficient to melt the one and not the other, as an alloy of copper and lead; liquation.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.