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How to properly dispose of e-waste?

Time:2022-10-23 14:03:47 Author:Suny Group

"Electronic waste" refers to discarded electrical or electronic equipment that is no longer used, mainly including household appliances such as refrigerators, air conditioners, washing machines, TV sets, and communication electronic products such as computers. E-waste needs to be handled carefully. In developing countries, the phenomenon of electronic waste is very serious, and the environmental pollution caused by it threatens the health of local residents. The types of electronic waste are very complex, and the products of the same function produced by various manufacturers are also different in material selection, design and production. Different discarded CRT monitors and chassis are generally divided into printed circuit boards (pcb), cables and wires, picture tubes, etc., and their recycling has always been a rather complicated issue. The question of proper disposal of electronic waste will be more urgent. There are several ways to dispose of e-waste:

Chemical treatment

The chemical treatment of electronic waste is also called wet treatment. The crushed electronic waste particles are put into acid or alkaline liquid, and the leachate is then subjected to a series of extraction, precipitation, replacement, ion exchange, filtration and distillation. The process culminates in a high-grade metal. However, in the process of chemical treatment, strong acid and highly toxic fluoride are used, which will generate a large amount of waste liquid and discharge toxic gases, which will cause great harm to the environment.

Fire treatment

Pyrolysis is a method of incinerating, smelting, sintering, melting, etc., of electronic waste to remove plastics and other organic components rich in metals. Fire processing can also cause serious harm to the environment. From the perspective of resource recovery and ecological environmental protection, these methods are difficult to promote. Guiyu Town, Guangdong, my country, etc., adopted these two treatment methods that are more harmful to the environment, which have brought serious impact on the local environment and sustainable development.

Mechanical processing

The mechanical treatment of electronic waste is a method of sorting based on the difference in physical properties between components, including disassembly, crushing, sorting and other steps. and other recycled raw materials. This treatment method has the advantages of low cost, simple operation, not easy to cause secondary pollution, and easy to achieve large-scale. Dismantling of electronic waste is usually done manually to recover the tested and useful electronic components. However, due to the large number of electronic components in electronic waste and the complicated combination method, the efficiency of manual processing is very low.

Microbial treatment

The use of microorganisms to leaching precious metals such as gold is a new technology for extracting precious metals from low-content materials that was studied in the 1980s. The activity of microorganisms makes other non-precious metals in precious metal alloys such as gold oxidize into soluble substances and enter the solution, so that the precious metals are exposed. out for easy recycling. The extraction of precious metals such as gold by biotechnology has the advantages of simple process, low cost and simple operation, but the leaching time is long. H.brandl et al. used Thiobacillus ferrooxidans to carry out leaching test on electronic waste pieces that had been crushed and pretreated. Under the selected temperature, ph and dosage, more than 90% of cu, zn and ni could be leached out. PB is stabilized in the precipitate in the form of PBSO4.

recycle and re-use

Some single pieces of electronic original waste can also be simply disassembled and recycled to the unit for reuse.

The e-waste recycling production line developed and manufactured by SUNY GROUP, from e-waste dismantling to PCB crushing, sorting and recycling, to the extraction of precious metals in e-waste, consists of a complete set of program processes. is in a leading position, if you have questions or ideas about e-waste recycling, please feel free to contact us.