Preparation of precursors for yttrium-containing advanced ceramics
This patent describes a process for extracting a blend of rare earths for components of a ceramics principally comprising at least one of zirconia or hafnium from a rare earth ore containing rare earth values and using the blend or rare earths in preparing a composite for use in fabrication of an ceramics containing oxides of the blend of rare earths. It comprises: feeding at least a portion of the rare earth ore to a fluidized bed chlorinator at 800{degrees}--1250{degrees}C to produce rare earth chlorides from the rare earth values contained in the ore; separating a blend of yttrium-depleted rare earth chlorides from yttrium chloride by-product, with the yttrium chloride by-product being separated by differential condensation from the blend of rare earth chlorides at 725{degrees}--1200{degrees}C; anhydrously reacting the separated blend of rare earth chlorides with at least one of alkoxide reactant selected from the group consisting of the alkali metal alkoxides to produce blend rare earth alkoxides and separating the blended rare earth alkoxides from reaction by-products and excess reagents; mixing the rare earth alkoxide with at least one of zirconium and hafnium alkoxide, to produce an alkoxide composite; and polymerizing and processing the composite into ceramic.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA
- Patent Number(s):
- US 4902655; A
- Application Number:
- PPN: US 7-121012A
- OSTI ID:
- 6862448
- Country of Publication:
- United States
- Language:
- English
Similar Records
Uranium-preextraction in zirconium/hafnium separations processs
Recovery of scandium, yttrium and lanthanides from zircon sand
Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINATION
ELEMENTS
HAFNIUM
HALOGENATION
METALS
ORE PROCESSING
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
PRECURSOR
PROCESSING
PRODUCTION
RARE EARTH COMPOUNDS
RARE EARTHS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM