High-pressure Distillation of Crude Zrcl4.
Skaggs-RL; Younghans-J; Rogers-DT; Hunter-DB
U.S. BoM, Albany Research Center, Albany, Oregon, NTIS: PB/86-158078 :41 pages
A high-pressure fractionation column for separation of hfcl4 and zrcl4 was built to evaluate the claims of a 1976 Japanese patent (76 65,093). A 35.5-In by 3/4-in-id stainless steel 316 column packed with inconel 600 helices was operated at 40 kg/cm2 (39 atm) pressure with reboiler and overhead condenser temperatures of 471 deg and 455 deg c, respectively. The total reflux operation produced zrcl4, with 800 mol ppm hfcl4 in the reboiler and with 5.2 Mol pct hfcl4 in the overhead. A 4.7-In height equivalent to a theoretical plate was determined using a variable separation factor. Although column corrosion partially obscured the redistribution tendencies of impurities, uranium clearly stayed in the reboiler. Of the potential construction metals exposed during distillation, inconel 625 and hastelloy c-276 showed the least corrosion.
NTIS Accession No.
U.S. Bureau of Mines Albany Research Center, Albany, Oregon, NTIS: PB/86-158078