THE ANION-EXCHANGE SEPARATION OF TITANIUM, ZIRCONIUM, NIOBIUM, TANTALUM, MOLYBDENUM AND TUNGSTEN, WITH PARTICULAR REFERENCE TO THE ANALYSIS OF ALLOYS

Journal Article · Sun Mar 01 00:00:00 EST 1964 · Analyst

DOI:https://doi.org/10.1039/an9648900185· OSTI ID:4054616

Dixon, E J; Headridge, J B

A detailed study was made of the adsorption of titanium, zirconium, niobium, tantalum, molybdenum, and tungsten on the anion-exchange resin, De- Acidite FF, from solutions containing mixtures of two or more of hydrofluoric acid, hydrochloric acid, ammonium fluoride, and ammonium chloride, with a view to obtaining a separation scheme for these elements that could be completed within 5 hours. A completely satisfactory separntion scheme was achieved, after determining the weight-distribution coefficients of the elements between aqueous solutions of the above reagents and the resin, and after investigating numerous elution curves for the elements from columns of the resin. Titanium(IV), zirconium, niobium(V), tantalum, molybdenum(VI), and tungsten(VI) were retained on the resin and separated from aluminum, vanadium(IV), chromium(III), manganese(II), iron(III), cobalt(II), nickel, and copper(IIl), by passing a solution of these elements in M hydrofluoric acid, followed by a wash solution of M hydrofluoric acid, through a column of the resin, of 100to 200-mesh size, in the chloride form. Titanium plus zirconium, tungsten, niobium, molybdenum, and tantalum were then quantitatively eluted from the resin with 0.01 M hydrofluoric acid--9 M hydrochloric acid, 3 M hydrofluoric acid-- 10 M hydrochloric acid, 0.2 M hydrofluoric acid-7 M hydrochloric acid, 3 M hydrofluoric acid--3 M hydrochloric acid, and M ammonium fluoride--4 M ammonium chloride mixtures, respectively. Good results were obtained when the scheme was applied to the separation of the elements in synthetic mixtures and alloys, in which instances spectrophotometric or volumetric methods were used for quantitatively determining the separated elements. (auth)

• Research Organization: Sheffield Univ., Eng.
• NSA Number: NSA-18-017941
• OSTI ID: 4054616
• Journal Information: Analyst, Vol. Vol: 89; Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ACIDITY
ADSORPTION
ALLOYS
ALUMINUM
ALUMINUM COMPOUNDS
AMMONIUM COMPOUNDS
CATIONS
CHLORIDES
COBALT COMPOUNDS
COPPER COMPOUNDS
DIAGRAMS
DISTRIBUTION
EFFICIENCY
ERRORS
EXTRACTION COLUMNS
FLUORIDES
GRAIN SIZE
HYDROCHLORIC ACID
HYDROFLUORIC ACID
IMPURITIES
INTERFERING ELEMENTS
ION EXCHANGE
ION EXCHANGE MATERIALS
IRON COMPOUNDS
MANGANESE COMPOUNDS
MEASURED VALUES
MIXING
MOLYBDENUM
MOLYBDENUM COMPOUNDS
NICKEL COMPOUNDS
NIOBIUM
NIOBIUM COMPOUNDS
PERFORMANCE
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
REACTION KINETICS
RESINS
SEPARATION PROCESSES
SOLUTIONS
TANTALUM
TANTALUM COMPOUNDS
TITANIUM
TITANIUM COMPOUNDS