Electronic waste.
Electronic waste, was abandoned no longer use electrical or electronic equipment, mainly including refrigerators, air conditioners, washing machines, televisions and other household appliances and computers and other communications electronics and other electronic technology outgrowths.
There are many types of e-waste, which can be roughly divided into two categories: one is the waste electronic products containing simple materials and less harmful to the environment, such as refrigerators, washing machines, air-conditioners and other household appliances, as well as medical and scientific research appliances, etc., and it is relatively simple to dismantle and dispose of this kind of products.
The other category is the waste electronic products containing more complex materials and more harmful to the environment, such as lead in the picture tubes of computers and TV sets, arsenic, mercury and other harmful substances contained in computer components, and arsenic, cadmium, lead, and a variety of other persistent degradation of raw materials for cell phones, as well as a variety of other bio-accumulative toxic substances, and so on.
Expanded Information
Electrical Waste Treatment Technology
1, chemical treatment and fire treatment
Chemical treatment is the crushed particles of electrical waste in the acid or alkaline leaching conditions, the leachate and then through a series of processes, such as extraction, precipitation, displacement, ion exchange, filtration and distillation. The leachate is then subjected to a series of processes such as extraction, precipitation, replacement, ion exchange, filtration and distillation, etc. The final result is a high-grade metal with high recovery rate.
But in the process of chemical treatment to use strong acid and highly toxic cyanide, etc., resulting in waste liquid on the environment is more harmful, harmless cost is higher. Pyro-processing for the e-waste incineration, smelting, sintering, melting, etc., to remove plastics and other organic components, metal enrichment method.
2, mechanical treatment methods
The use of physical property differences between the components of the mechanical treatment method of sorting exists at low cost, simple operation, not easy to cause secondary pollution, easy to realize the advantages of scale and so on. The mechanical treatment method mainly includes dismantling, crushing, sorting, etc., and the treated material can be obtained after smelting, landfill, incineration and other treatments such as metal, plastic, glass and other renewable raw materials.
Therefore, mechanical treatment can make the valuable substances in the e-waste fully enriched, reduce the difficulty of subsequent processing, and improve the recycling efficiency.
Baidu Encyclopedia - Electrical Waste
Baidu Encyclopedia - Electronic Waste