METHOD FOR SEPARATING HAFNIUM FROM ZIRCONIUM Russian patent published in 2007 - IPC C22B34/14 C22B3/26

Abstract RU 2296172 C2

FIELD: inorganic chemistry, hydrometallurgy, chemical technology.

SUBSTANCE: invention relates to a method for separation of hafnium and zirconium. Method involves extraction step of the parent aqueous mixture containing zirconium oxychloride, hafnium oxychloride and thiocyanate salt with a thiocyanate-containing organic solvent for preparing zirconium-containing aqueous raffinate flow and hafnium-containing organic raffinate flow, separation of organic raffinate flow from aqueous raffinate flow. In the aqueous parent mixture the ratio value of total acidity to the total sum of zirconium and hafnium oxides (TA/MO₂) in maintained in the range from about above 2.55 to about less 3.5. Method provides optimization process for separating zirconium from hafnium by extraction procedure.

EFFECT: improved separating method.

21 cl, 2 dwg, 1 ex

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RU 2 296 172 C2

Authors

Sommerz Dzhejms A.

Perrin Dzheff Dzh.

Dates

2007-03-27—Published

2003-01-28—Filed