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Baddeleyite Belgian rolls briquetted in Belgian Bureau of Mines Byproduct magnesium chloride calcine is fed carbon Chlorinator unit cleaning the sponge condenser conium cooled calcine crucible direct chlorination distillation furnace distillation step electrodes element 72 filled with helium floating top fluoride forged and rolled furnace is bled Georg von Hevesy hafnium chloride hafnium compounds hafnium hydroxide hafnium metal hafnium oxide hafnium production hafnium sponge hafnium tetrachloride hafnyl chloride hammer mill helium-atmosphere box HfOCl2 hydrolysis impurities inches inert atmosphere iodide-dissociation Kroll process LOWER ZONE HEATING material MgCl2 mixture moisture molten magnesium muffle furnace oxide and sucrose oxide residue percent hafnia pilot-plant pound of product PRODUCTION OF HAFNIUM purification furnace pyrophoric raw chloride reaction reduction furnace removed retort rolled to sheet Self-locking table sponge metal stoichiometric sublimation sucrose are ribbon-mixed thorium tion top with dense vacuum distillation volts zircon zirconia zirconium oxide zirconium tetrachloride ZONE HEATING ELEMENT zone temperature