The use of physical methods for the crushing-dissociation-sorting of municipal solid waste has the characteristics of low investment and low environmental pollution, and is the current development trend of electronic waste disposal.
In fact, electronic waste contains many non-ferrous metals, ferrous metals, glass and other materials that can be recycled. According to the results of research and analysis, 286 lb of copper, 11b of gold, and 441b of tin can be separated from the 1t electronic boards that is random collection , of which only llb gold is worth 6,000 US dollars (1 lb = 0.45359 kg). It can be said that there are significant business opportunities in "e-waste". If the "metal waste" contains precious metals such as gold, silver, copper, tin, chromium, platinum and palladium, it will be incalculable wealth.
The metals contained in electronic waste, especially precious metals, are ten or even hundreds of times higher than natural minerals, and the recovery cost is generally lower than that of natural mineral deposits. For example, 1t old mobile phone waste battery can extract 100g of gold from it, while ordinary gold-bearing ore can only extract 6g per ton, but many are only a few dozen grams. It can be said that the old mobile phone is a kind of gold ore with a fairly high grade. In printed circuit boards, the most metal is copper, in addition to gold, aluminum, nickel, lead, silicon metal, etc., of which there are many rare metals. Statistics show that the gold content per ton of waste circuit board reaches about 1000g. With the improvement of the technological level, 300g of gold has been extracted per ton of waste circuit board, and the market price is about 30,000 yuan.
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