US 12,351,982 B2
Method for recycling waste aramid-mica composite paper
Zhaoqing Lu, Xi'an (CN); Fengfeng Jia, Xi'an (CN); Li Hua, Xi'an (CN); Songfeng E, Xi'an (CN); Yuanqing Liu, Xi'an (CN); Jiayue Dong, Xi'an (CN); Nan Li, Xi'an (CN); and Bo Geng, Xi'an (CN)
Assigned to Shaanxi University of Science & Technology, xi'an (CN)
Filed by Shaanxi University of Science & Technology, Xi'an (CN)
Filed on Jul. 6, 2022, as Appl. No. 17/858,952.
Prior Publication US 2022/0340730 A1, Oct. 27, 2022
Int. Cl. D21C 5/02 (2006.01); B09B 3/80 (2022.01); C01B 33/20 (2006.01); C08J 11/08 (2006.01); D21C 3/20 (2006.01); D21C 11/10 (2006.01)
CPC D21C 5/02 (2013.01) [B09B 3/80 (2022.01); C01B 33/20 (2013.01); C08J 11/08 (2013.01); D21C 3/20 (2013.01); D21C 5/022 (2013.01); D21C 11/10 (2013.01); C08J 2377/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for recycling waste aramid-mica composite paper, comprising:
(S1) pre-processing the waste aramid-mica composite paper to obtain a dehydrated aramid-mica composite paper scrap;
(S2) dissolving the dehydrated aramid-mica composite paper in a mixture solution to obtain a mixture system A, wherein the mixture solution comprises a dispersing agent, an alkali, and an organic solvent;
(S3) filtering the mixture system A with a primary filter to obtain a mica flake and an aramid fiber solution;
(S4) adding a replacement solvent to the aramid fiber solution for solvent replacement and phase separation to obtain an aramid fiber suspension;
(S5) filtering the aramid fiber suspension with a secondary filter to obtain an aramid fiber gel and a mixture system B composed of the organic solvent and the dispersing agent; and
(S6) subjecting the mixture system B to distillation at a preset temperature to recycle the organic solvent; and drying the aramid fiber gel to collect aramid fiber.