12th INTERNATIONAL CERAMICS CONGRESS PART I Proceedings of the 12 th International Ceramics Congress, part of CIMTEC 2010- 12 th International Ceramics Congress and 5th Forum on New Materials Montecatini Terme, Italy, June 6-11, 2010 PART I including: Symposium CL – Refractories: Recent Developments in Materials, Production and Use