US 11,870,095 B2
Method for treating waste diaphragm paper of lithium battery
Haibing Cai, Changsha (CN); Qiang Li, Changsha (CN); Changdong Li, Changsha (CN); Ruokui Chen, Changsha (CN); and Song Chen, Changsha (CN)
Assigned to HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Changsha (CN); GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Foshan (CN); and HUNAN BRUNP EV REYCLING CO., LTD., Changsha (CN)
Appl. No. 18/043,881
Filed by HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Changsha (CN); GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Foshan (CN); and HUNAN BRUNP EV RECYCLING CO., LTD., Changsha (CN)
PCT Filed May 12, 2021, PCT No. PCT/CN2021/093183
§ 371(c)(1), (2) Date Mar. 2, 2023,
PCT Pub. No. WO2022/052497, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 202010938775.9 (CN), filed on Sep. 9, 2020.
Prior Publication US 2023/0246294 A1, Aug. 3, 2023
Int. Cl. H01M 50/403 (2021.01); H01M 6/52 (2006.01); H01M 10/0525 (2010.01); H01M 10/54 (2006.01); B09B 3/35 (2022.01); B09B 3/70 (2022.01); B09B 3/30 (2022.01); B09B 101/16 (2022.01)
CPC H01M 50/403 (2021.01) [B09B 3/30 (2022.01); B09B 3/35 (2022.01); B09B 3/70 (2022.01); H01M 6/52 (2013.01); H01M 10/0525 (2013.01); H01M 10/54 (2013.01); B09B 2101/16 (2022.01); Y02W 30/84 (2015.05)] 5 Claims
OG exemplary drawing
 
1. A method for treating waste diaphragm paper of a lithium battery, comprising the following steps of:
(1) shearing and crushing waste diaphragm paper, and then carrying out pneumatic separation to obtain a light material and a copper-aluminum mixture;
(2) putting the light material into a flotation machine for separation to obtain diaphragm paper and battery powder; and
(3) pulping the battery powder, and then carrying out leaching of hydrometallurgy, pickling the diaphragm paper, and then filtering and spin-drying to obtain the diaphragm paper;
wherein, in step (1), the method further comprises a step of putting the copper-aluminum mixture into an eddy-current separator for separation to obtain metallic copper and metallic aluminum; a rotor speed of the eddy-current separator ranges from 20 Hz to 40 Hz and a belt speed of the eddy-current separator ranges from 10 Hz to 15 Hz;
in step (3), the specific operation of the leaching of hydrometallurgy is: after pulping the battery powder into a slurry, adding the slurry into a pickling solution for pickling, then adding a reducing agent for reductive leaching, and adjusting a pH to be acidic to obtain leachate; and
in step (3), in the process of pickling the diaphragm paper, the pickling solution used in the pickling is sulfuric acid with a concentration of 0.5 mol/L to 1.5 mol/L; the pickling is carried out at a rotating speed ranging from 200 r/min to 400 r/min, and the pickling lasts for 10 minutes to 30 minutes; and
a mass ratio of the diaphragm paper to the pickling solution is 1:(5 to 10).