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4-inch glass columns 40 gallons 7-molar Albany ammonia ammonium sulfate ammonium thiocyanate average batch Bureau of Mines concentration contained corrosion Diammonium phthalate diethyl ether extraction columns extraction system extractor feed makeup feed pump filter cake filter press flow rate gal./hr gallons per hour hafnium oxide hafnium product Hastelloy HCNS hexone hydrochloric acid IbVhr installed Itx/hr lb./gal methyl isobutyl ketone Milton Roy moIar NH4CNS NH4OH organic phase organic stream Overholser percent ammonium hydroxide Phthalic anhydride plant operation pound of zirconium pound per gallon ratio recovered recovery column regenerated solvent repulper rotary Scrubbed solvent Separation of Hafnium separation plant shown in table slop solvent extract Solvent Regeneration specific gravity storage tank stripper Stripping acid stripping column stripping system sulfuric acid Teflon Thio thiocyanate recovery thiocyanic acid Tygon zirconium and hafnium zirconium hydroxide zirconium oxide zirconium per gallon zirconium raffinate zirconium tetrachloride ZIRCONIUM-HAFNIUM SEPARATION zirconyl chloride solution ZrCl