US 11,987,862 B2
Method for liquefying niobium and tantalum, and method for producing niobium solution and tantalum solution
Hironari Kubo, Fukuoka (JP); Takuto Nishida, Fukuoka (JP); and Sayaka Masuda, Fukuoka (JP)
Assigned to Fukuoka Institute of Technology, Fukuoka (JP)
Appl. No. 18/278,826
Filed by Fukuoka Institute of Technology, Fukuoka (JP)
PCT Filed Feb. 9, 2022, PCT No. PCT/JP2022/005190
§ 371(c)(1), (2) Date Aug. 24, 2023,
PCT Pub. No. WO2022/196197, PCT Pub. Date Sep. 22, 2022.
Claims priority of application No. 2021-041753 (JP), filed on Mar. 15, 2021.
Prior Publication US 2024/0084417 A1, Mar. 14, 2024
Int. Cl. C22B 3/00 (2006.01); C22B 3/06 (2006.01); C22B 3/22 (2006.01); C22B 34/24 (2006.01)
CPC C22B 3/06 (2013.01) [C22B 3/22 (2013.01); C22B 34/24 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for liquefying niobium or tantalum comprising the steps of:
forming a molten substance by making a mixture of an ammonium salt and a powdered substance containing at least one element of niobium or tantalum;
dissolving the molten substance, which has been solidified, in a predetermined amount of solvent to form a suspension;
subjecting the suspension to solid-liquid separation into a precipitate and a liquid; and
dissolving the precipitate by reaction with an acid solution.