Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1990-10-31
1992-07-21
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210634, 210511, 423 70, B01D 1104
Patent
active
051320169
ABSTRACT:
A process for producing nuclear grade zirconium and a liquid-liquid separation circuit for separating zirconium from hafnium are provided. The process employs an aqueous feed of ZrOCl.sub.2 in the presence of thiocyanate, an organic solvent and acid and a series of high mass transfer efficiency pulse columns in which are conducted the iron extraction, hafnium extraction, zirconium stripping, hafnium scrubbing and zirconium and hafnium thiocyanate recovery processes required to produce substantially hafnium-free nuclear grade zirconium. A feed zone mixer-settler separates thiocyanate and zirconium injection points and permits the prestripping of zirconium prior to the main stripping operation. All of the scrubbed solvent and the thiocyanate are regenerated. Higher concentrations, smaller flows, and compact equipment result in the present process requiring substantially reduced in-process inventories as compared to previously known Zr/Hf separation processes. The Zr/Hf separation process described herein also achieves further processing efficiencies not produced by the prior art.
REFERENCES:
patent: 3006719 (1961-10-01), Miller
Spear Frank
Valentine J. C.
Westinghouse Electric Corp.
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