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US 12,351,982 B2Granted
Method for recycling waste aramid-mica composite paper
AssigneeShaanxi University of Science and Technology
InventorsZhaoqing Lu, Fengfeng Jia, Li Hua, Songfeng E, Yuanqing Liu, Jiayue Dong, Nan Li, Bo Geng
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Abstract
The disclosure relates to resource recycling, and more particularly to a green and efficient method for recycling waste aramid-mica composite paper. The method includes: dissolution of aramid-mica composite paper scraps, separation of mica flakes; phase separation, filtration, recycling of organic solvent and collection of aramid fiber.
Claims10
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.
5 more elements
Dependencies are inferred from the claim text.