Attachment: electronic waste is a wide variety of roughly can be divided into two categories: a class of materials contained in relatively simple, less harmful to the environment of waste electronic products, such as refrigerators, washing machines, air conditioning and other household appliances, as well as medical, scientific research appliances, etc., the dismantling and processing of such products is relatively simple; the other is the material contained in the more complex, environmentally hazardous waste electronics, such as computers, television tubes. Lead in the picture tubes of computers and televisions, arsenic, mercury and other hazardous substances contained in computer components, arsenic, cadmium, lead and many other persistent and bioaccumulative toxic substances in the raw materials of cell phones, and so on. Memory cards should belong to the former. The main methods of treating and disposing of e-waste are chemical treatment methods, fire methods, mechanical treatment methods, electrochemical methods or a combination of several methods. Chemical treatment, also known as wet processing, will be crushed e-waste particles into the acid ah or alkaline liquid, the leachate and then through a series of processes such as extraction, precipitation, replacement, ion exchange, filtration, and distillation and ultimately get high-grade metal. But in the process of chemical treatment to use strong acid and highly toxic fluoride, etc., will produce a large amount of waste liquid, and the emission of toxic gases, a greater harm to the environment. Pyro-processing is a method of removing plastics and other organic components enriched with metals by incinerating, smelting, sintering, melting, etc., of electronic waste. From the point of view of resource recovery, ecological and environmental protection, these two methods are difficult to promote. At present, the method of mechanical treatment is recommended. Mechanical processing is the use of physical property differences between the components of the sorting method, including disassembly, crushing, sorting and other steps, sorting and processing of materials and then after subsequent processing can be obtained respectively metal, plastic, glass and other renewable raw materials.
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