SYSTEMS AND METHODS FOR RECOVERY OF RARE-EARTH CONSTITUENTS FROM ENVIRONMENTAL BARRIER COATINGS

摘要

Systems and methods for recovery of rare-earth constituents from environmental barrier coatings are provided. One method includes extracting rare-earth (RE) oxide constituents from a feedstock containing RE silicates and non-RE contaminants. The method includes leaching the REs from the feedstock into an acid to form an acid solution, performing an oxalate precipitation on the acid solution to form an RE oxalate hydrate, and separating the RE oxalate hydrate from the acid solution. The method also includes heat treating the RE oxalate hydrate to form an RE oxide containing the RE elements extracted from the feedstock.

主权项

1. A method for extracting rare-earth (RE) oxide constituents from a feedstock containing RE silicates and non-RE contaminants, the method comprising:
leaching the REs from the feedstock into an acid to form an acid solution; performing an oxalate precipitation on the acid solution to form an RE oxalate hydrate; separating the RE oxalate hydrate from the acid solution; and heat treating the RE oxalate hydrate to form an RE oxide containing the RE elements extracted from the feedstock.