2nd International Symposium on High-Temperature Metallurgical Processing proceeding of a symposium sponsored by the Pyrometallurgy Committee of the Extraction and Processing Division and the Energy Committee of the Extraction and Processing Division and the Light Metals Division of TMS (The Minerals, Metals & Materials Society), held during the TMS 2011 Annual Meeting & Exhibition, San Diego, California, USA, February 27-March 3, 2011