Source : Webster's Revised Unabridged Dictionary (1913)

Amalgamator \A*mal"ga*ma`tor\, n.
   One who, or that which, amalgamates. Specifically: A machine
   for separating precious metals from earthy particles by
   bringing them in contact with a body of mercury with which
   they form an amalgam.

Source : WordNet®

amalgamator
     n : a businessman who arranges an amalgamation of two or more
         commerical companies