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zirconiumhafnium oxides from furnace products
Fractional crystallization studies
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1-hour periods 1.4 vol pct 100 Hf Hf+Zr acid concentration ammonium hydroxide analyses bench-type furnace Bureau of Mines carbonate or potassium concentration and solution-to-solid concentration of salts cooled leach liquor corrosion countercurrent leach tests crucible double leach electrical resistance electrode extractabilities from fused Extraction of Zirconium-Hafnium filtrate First-stage liquor fluorine fused charge fused material containing fusion furnaces graphite hafnium contents hafnium hexafluoride hafnium was recovered Hf/(Hf+Zr hydrofluoric acid Hydrous hydrous oxide liquors with suitable Lloyd H material were leached pet acid 1.4 potassium carbonate potassium chloride potassium hydroxide potassium silicofluoride potassium zirconium hexafluoride primary crystals PRODUCING HAFNIUM-ENRICHED FEED proportion of zirconium recrystallization Regression analysis salt concentrations salts from fused Selective leaching sintering SOLIDS RATIO soluble salts SOLUTION-TO solution-to-solids ratios stage liquor subsequent crystallization operation TABLE Test results tilting-type furnace vol pet acid weight-percent zircon zirconium and hafnium zirconium salt zirconium tetrachloride zirconium-hafnium extraction zirconium-hafnium fluoride zirconium-hafnium oxides zirconium-hafnium salts Zr+Hf)0 content