Process by which pure copper obtained from smelted copper in a Baltimore refinery.
Baltimore Maryland USA Date:1927 Duration:4 min 35 sec Sound:NO SOUND
Copper impurities remained after smelting removed by melting and electrolysis. Tank room of electrolytic refinery plant at Baltimore. The anodes placed in empty tank. Thin sheets of pure copper, serving as cathodes inserted between the anodes. The tank then filled with a dilute solution of copper sulphate. An electric current flows from the anode, through the solution, to the cathode on which pure copper is deposited. After removing the cathodes from remnants of anodes a sludge, into which the gold, silver and platinum has fallen, flushed out of the tank. Sludge melted by a worker into a bullion bar. The copper cathodes melted.
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