Ion exchange purification of scandium

Patent · Tue Oct 23 04:00:00 EDT 1990

OSTI ID:867568

Herchenroeder, Laurie A ^[1]; Burkholder, Harvey R ^[2]

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1. Noblesville, IN
2. Ames, IA

An improvement in purification of scandium through ion exchange chromatography is disclosed in which the oxidation potential of the eluting solution is altered by the addition of potassium chlorate or ammonium chloride so that removal of contaminants is encouraged. The temperature, pH and concentration of the eluent HEDTA are controlled in order to maintain the scandium in the column while minimizing dilution of the scandium band. Recovery of scandium is improved by pumping dilute scandium over the column prior to stripping the scandium and precipitation. This eliminates the HEDTA ion and other monovalent cations contaminating the scandium band. This method maximizes recovery of scandium while maintaining purity.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
• DOE Contract Number: W-7405-ENG-82
• Assignee: Iowa State University Research Foundation, Inc. (Ames, IA)
• Patent Number(s): US 4965053
• Application Number: 07/310,044
• OSTI ID: 867568
• Country of Publication: United States
• Language: English

Related Subjects

/423/210/
addition
altered
ammonium
ammonium chloride
band
cations
chlorate
chloride
chromatography
column
concentration
contaminants
contaminating
controlled
dilute
dilution
disclosed
eliminates
eluent
eluting
encouraged
exchange
exchange chromatography
hedta
improved
improvement
maintain
maintaining
maximizes
method
minimizing
monovalent
monovalent cation
oxidation
oxidation potential
ph
potassium
potential
precipitation
prior
pumping
purification
purity
recovery
removal
scandium
solution
stripping
temperature