US 12,384,717 B2
Salt bath compositions and methods for regenerating salt bath compositions
David Eugene Baker, Bath, NY (US); Albert Joseph Fahey, Corning, NY (US); Qiang Fu, Painted Post, NY (US); Yuhui Jin, Painted Post, NY (US); Wei Sun, Painted Post, NY (US); Ljerka Ukrainczyk, Ithaca, NY (US); and Shelby Kerin Wilson, Corning, NY (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Appl. No. 17/642,432
Filed by CORNING INCORPORATED, Corning, NY (US)
PCT Filed Sep. 10, 2020, PCT No. PCT/US2020/050084
§ 371(c)(1), (2) Date Mar. 11, 2022,
PCT Pub. No. WO2021/050652, PCT Pub. Date Mar. 18, 2021.
Claims priority of provisional application 62/899,890, filed on Sep. 13, 2019.
Prior Publication US 2022/0348496 A1, Nov. 3, 2022
Int. Cl. C03C 21/00 (2006.01)
CPC C03C 21/002 (2013.01) 15 Claims
OG exemplary drawing
 
1. A method for regenerating a salt bath composition, the method comprising:
heating the salt bath composition to an ion exchange temperature to form a molten salt bath;
contacting at least a portion of an ion-exchangeable article comprising lithium oxide with the molten salt bath, whereby lithium cations diffuse from the ion-exchangeable article and into the molten salt bath;
adding a first phosphate salt to the molten salt bath, whereby a lithium phosphate salt comprising at least a portion of the lithium cations is formed and precipitates from the molten salt bath; and
adding a multivalent salt comprising a multivalent metal cation to the molten salt bath, whereby a second phosphate salt comprising the multivalent metal cation is formed and precipitates from the molten salt bath.