US 11,987,861 B2
Method for recovering valuable metal from waste electrode material of lithium secondary battery by using lithium carbonate
Suk Joon Park, Gyeongsangbuk-do (KR); Myung Gyu Lee, Gyeonggi-do (KR); Jeong Sik Hong, Chungcheongbuk-do (KR); So Yeong Byun, Chungcheongbuk-do (KR); Gwang Seok Lee, Gyeongsangbuk-do (KR); Jong Sun Park, Chungcheongbuk-do (KR); Beom Seok Seo, Gyeongsangbuk-do (KR); Min Woo Lee, Chungcheongbuk-do (KR); Da Mo A Kim, Chungcheongbuk-do (KR); Hui Sang Kim, Gyeongsangbuk-do (KR); and A Ram Park, Chungcheongbuk-do (KR)
Assigned to ECOPRO INNOVATION CO., LTD., Chungcheongbuk-Do (KR)
Appl. No. 17/922,644
Filed by ECOPRO INNOVATION CO., LTD., Chungcheongbuk-do (KR)
PCT Filed May 21, 2021, PCT No. PCT/KR2021/006364
§ 371(c)(1), (2) Date Nov. 1, 2022,
PCT Pub. No. WO2021/241944, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 10-2020-0063069 (KR), filed on May 26, 2020.
Prior Publication US 2023/0160036 A1, May 25, 2023
Int. Cl. C22B 3/00 (2006.01); C01G 51/06 (2006.01); C01G 53/06 (2006.01); C22B 1/00 (2006.01); C22B 3/08 (2006.01); C22B 7/00 (2006.01); C22B 26/12 (2006.01); H01M 10/54 (2006.01)
CPC C22B 23/043 (2013.01) [C01G 51/06 (2013.01); C01G 53/06 (2013.01); C22B 1/005 (2013.01); C22B 3/08 (2013.01); C22B 7/007 (2013.01); C22B 23/0453 (2013.01); C22B 26/12 (2013.01); H01M 10/54 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of recovering valuable metals by using a waste electrode material, the method comprising:
a waste electrode material preparation step of preparing a waste electrode material;
a pre-processing step of thermally processing the waste electrode material in a firing furnace in a temperature range of 300° C. to 500° C. for a duration of 30 minutes to 120 minutes;
a sulfuric acid dissolution step of, after the pre-processing step, adding sulfuric acid to the waste electrode material so that the waste electrode material reacts with the sulfuric acid;
a first solid-liquid separation step of separating the resulting product obtained through the sulfuric acid dissolution step into a metal melt and an unreacted residue;
a precipitation step of mixing lithium carbonate (Li2CO3) with the metal melt and stirring the resulting mixture; and
a second solid-liquid separation step of separating the resulting product obtained through the precipitation step into a precipitate and a filtrate,
wherein an aqueous solution of lithium sulfate is recovered from the filtrate, and nickel carbonate and cobalt carbonate are recovered from the precipitate.