Small-molecule auxiliary electronic waste recycling method based on ester bond exchange reaction

Abstract

The invention discloses a small-molecule auxiliary electronic waste recycling method based on an ester bond exchange reaction. The small-molecule auxiliary electronic waste recycling method includes the following steps that waste electronic waste is immersed into small molecule treatment liquid, and the mixture is placed into a heatable vessel; the small molecule treatment liquid is slowly heatedto 120 DEG C to 200 DEG C, and heat preservation is conducted for 0.5 hours to 8 hours; then substrate resin containing ester bond functional groups is degraded, electronic components and substrates are separated, and full recovery and recycling of various materials in the electronic waste are achieved. According to the small-molecule auxiliary electronic waste recycling method, it is realized that the substrate resin containing the ester bond functional groups is degraded at a low temperature, the electronic components and the substrates are separated, and therefore complete recovery and recycling of various materials including the electronic components, the resin, glass fibers and the like can be achieved accordingly.

Description

technical field [0001] The invention belongs to the technical field of electronic waste treatment, and in particular relates to a method for recycling electronic waste assisted by small molecules based on transesterification reaction. Background technique [0002] With the rapid development of the electronics industry, there are various types and huge quantities of electronic waste generated around the world every year. Electronic waste represented by industrial circuit boards is rich in various organic substances (such as bromide, etc.) and high-purity metal elements (such as gold, silver, copper, platinum, etc.), which not only cause serious environmental pollution, but also It will cause a great waste of resources [1,2]. Therefore, e-waste recycling has become an important part of the development of a green circular economy. [0003] In the process of electronic waste recycling, removing organic matter and separating electronic components and substrates is a very critic...

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Problems solved by technology

[0005] 1. The mechanical recycling method is low in cost, has little negative impact on the environment, and is widely used. However, the method is not efficient and the process is cumbersome. The crushing and grinding will cause damage to the glass fiber and other materials in the plate, so that it can only be downgraded and reused. (such as filling particles), and there is also an inevitable material loss problem during the separation process

[0006] 2. In the heat treatment method, the equipment is expensive, and the reaction temperature of high-temperature pyrolysis of resin is far above 200°C. Resin and glass fiber cannot be recycled and reused. In addition, the toxic waste gas generated during the pyrolysis process will seriously pollute the air, and special treatment must be carried out. Purification and protection

[0007] 3. The chemical treatment method requires expensive equipment and requires harsh high temperature and high pressure conditions. The strong acid and strong alkali treatment solution will corrode the surface of resin and glass fiber, making it difficult to recycle and reuse. In addition, the waste liquid will seriously threaten environmental safety and human health.

[0008] To sum up, how to efficiently and environmentally friendly recycle e-waste is still a major challenge for the development of the recycling industry

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