T.T. Chen Honorary Symposium on Hydrometallurgy, Electrometallurgy and Materials Characterization proceedings of a symposium sponsored by the Hydrometallurgy and Electrometallurgy Committee and the Materials Characterization Committee of the Extraction and Processing Division of TMS (The Minerals, Metals & Materials Society), held during the TMS 2012 Annual Meeting & Exhibition, Orlando Florida, USA, March 11-15, 2012 /