THE GRAVIMETRIC AND VOLUMETRIC DETERMINATIONS OF TOTAL RARE EARTH OXIDES, CERIUM OXIDE, SILICA AND THORIA IN MONAZITE SAND

Technical Report · Tue Mar 31 00:00:00 EST 1959

OSTI ID:4221617

The rare earths and thorium are extracted with concentrated sulfuric acid and separated by precipitation as hydroxide and then as oxalat. The oxalates are ignited to oxides and weighed as such. The oxides are dissolved in sulfuric acid. The cerium is oxidized with ammonium persulfate and determined by titration with ferrous ammonium sulfate solution and standard potassium dichromate solution. The insoluble material from the initial sulfuric acid attack contains all the silica. It is ignited and fused with potassium hydrogen sulfate. The cooled melt is leached with dilute nitric acid and the insoluble matter, containing all the silica, separated by filtration. The residues are ignited in a platinum crucible and the silica determined by the hydrofluoric acid procedure. Thoria is determined by extracting the thorium from monazite sand with sulfuric acid, and after double precipitation as iodate, the thorium is precipitated as oxalate using oxalic acid. The filtered precipitate is ignited and weighed as thoria. The residue after extraction with sulfuric acid, is fused with potassium hydrogen sulfate and is treated in a sinailar manner. (auth)

• Research Organization: United Kingdom Atomic Energy Authority. Industrial Group. Springfields Works, Springfields, Lancs, England
• NSA Number: NSA-13-020887
• OSTI ID: 4221617
• Report Number(s): IGO-AM/S-195
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-59
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ACIDITY
AMMONIUM COMPOUNDS
CERIUM OXIDES
CHROMATES
HYDROFLUORIC ACID
HYDROXIDES
IODATES
IRON SULFATES
LEACHING
MINERALS
MOHR SALT
MONAZITES
OXALATES
OXIDATION
OXIDES
POTASSIUM OXIDES
POTASSIUM SULFATES
PRECIPITATION
PYROLYSIS
QUALITATIVE ANALYSIS
RARE EARTHS
REDUCTION
SAND
SEPARATION PROCESSES
SILICON OXIDES
SOLUBILITY
SOLUTIONS
STANDARDS
SULFATES
SULFURIC ACID
THORIUM COMPOUNDS
THORIUM OXIDES
TITRATION
VOLATILITY