	US 12,378,640 B2
	Composition and method or recovering rare-earth elements
Bradley Stockmann, St. Louis, MO (US)
Filed by Bradley Stockmann, St. Louis, MO (US)
Filed on Oct. 11, 2021, as Appl. No. 17/498,597.
Claims priority of provisional application 63/090,605, filed on Oct. 12, 2020.
Prior Publication US 2022/0112577 A1, Apr. 14, 2022
Int. Cl. C22B 59/00 (2006.01); C22B 3/26 (2006.01); C22B 7/00 (2006.01)

CPC C22B 59/00 (2013.01) [C22B 3/306 (2021.05); C22B 7/007 (2013.01)]

15 Claims

1. A method of separating a metal of gadolinium from a chelate, the method comprising:

a. pooling residual amounts of a solution from two or more containers to form a residual solution, wherein said residual solution comprises a (i) compound comprising gadolinium or gadolinium ion and a chelate or polyol, (ii) an excipient, and (iii) water for injection; and

b. extracting said gadolinium or gadolinium ion from said residual solution comprising a step of forming a gadolinium salt precipitate by reducing the pH of the residual solution to pH<1.