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20-inch-diameter furnace atmosphere baffle bimetallic reduction bimetallic-reduced sponge bimetallic-reduced zirconium Brinell hardness 3,000-kg Bureau of Mines byproduct salts chemical analyses chloride charge chromium coalesced contained excess magnesium extrusion Hafnium hardness testing heated helium hygroscopic impurity content Inconel ingots Kroll process lowering of retort magnesium chloride magnesium-reduced sponge melting middle zone temperature mixture of sodium percent procedure QUALITY OF ZIRCONIUM quantity of sodium reaction crucible reaction of zirconium reaction products reaction temperature reduced sponge reduction crucible reduction furnace reduction of zirconium reduction runs reduction tests remove residual salt content retort gases retort pressure samples sodium and magnesium sodium chloride Sodium line Sodium-reduced sponge sponge was crushed stainless steel TABLE temperature setting tetrachloride was purified Thermocouple three types tion types of sponges vacuum distillation furnace valve vapor phase vapor pressure vented volatile impurities water-cooled Zirconium chloride Zirconium metal zirconium oxide zirconium sponge zirconium tetra zirconium tetrachlo zirconium tetrachloride vapors ZrCl4