1. 
   electrorefining
   Electrorefining is a method for purifying a metal using electrolysis. An electric current is passed between a sample of the impure metal and a cathode when both are immersed in a solution that contains cations of the metal. Metal is stripped off the impure sample and deposited in pure form on the c...
   Found op http://antoine.frostburg.edu/chem/senese/101/glossary/e.shtml
   
   
2. 
   electrorefining
   (from the article `metallurgy`) ...is brought lower or controlled by pyrometallurgical, electrolytic, or chemical means. Pyrometallurgical refining usually consists of the oxidizing ... This method gives the highest-purity metal product as well as the best recovery of valuable impurities. It is used...
   Found op http://www.britannica.com/eb/a-z/e/20
   
   

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