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E-waste contains many valuable precious metals, such as gold, silver, copper and aluminum. These precious metals can be recovered by the following methods:
Physical separation method: The e-waste is subjected to physical treatment such as crushing, screening and magnetic separation to separate out the parts containing precious metals.
Chemical extraction method: Precious metals are extracted from e-waste using chemical methods. This process requires the use of chemical reagents, such as sodium cyanide, ammonium chloride, sulfuric acid, etc., and requires attention to chemical safety.
Pyrolysis method: The e-waste is treated at high temperature to decompose the organic matter in it so that the precious metals can be recovered.
Bio-extraction method: By using the metabolic properties of certain biological cells, bacteria and other microorganisms, the precious metals in e-waste are transformed into soluble substances, which can then be recovered.
It should be noted that the precious metal content in e-waste is very limited and the cost of recycling is high, so a sustainable recycling approach should be adopted, such as recycling used electronics or making design improvements to electronics to reduce the demand for precious metals.
In addition, methods of recycling precious metals from e-waste also need to consider environmental protection and human health issues. The recycling process may generate toxic waste and emit harmful gases, so measures need to be taken to deal with them, such as the use of environmentally friendly equipment and chemicals, to reduce the impact on the environment.
In addition, the recovery of precious metals also requires technical support and expertise because of the small amount of precious metals in e-waste. The recovery process requires multiple steps such as laboratory testing, equipment operation and data analysis to ensure the quality and safety of precious metal recovery.
Finally, e-waste recycling of precious metals also requires the support and participation of the government and society. The government can regulate and promote the recycling and disposal of e-waste by formulating relevant policies and regulations, while providing financial support and technical support; society can actively participate in the obligations and responsibilities of e-waste recycling and adopt sustainable consumption behaviors to reduce the generation of e-waste and its impact on the environment.
