Foreword, 1. KARL JOSEF BAYER (1847-1904): A Pioneer in Hydrometallurgy and Pressure Technology, 2. FLUIDIZATION IN EXTRACTIVE METALLURGY, 3. SEPARATION OF NICKEL AND COPPER FROM MATTE BY FLOTATION AND HYDROMETALLURGICAL Treatment, 4. SEGREGATION PROCESS FOR COPPER AND NICKEL Ores, 5. THE REDUCTION OF OXIDES BY METALS, 6. THE REDUCTION OF HALIDES - Electrolytic, Gaseous, and Metallothermic