1. Process Metallurgy Group; University of Oulu; University of Oulu; PO Box 4300 FI-90014 Finland
2. Department of Industrial Furnaces and Heat Engineering; RWTH Aachen University; Kopernikusstraße 10 D-52074 Aachen Germany
3. Department of Materials Science and Engineering; Aalto University; PO Box 16200 FI-00076 Aalto Finland