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What does gold in garbage mean?

Refers to some gold-containing waste products. According to the query of Chemical Network, the chemical properties of gold are very stable and plastic, and it is not easy to react with other things, while other metals are easy to be oxidized. The most important circuit system in electronic products contains gold, and the gold content of one ton of gold ore is about 15-20g. In contrast, the gold content of a ton of used mobile phones is much higher than that of gold ore, so the waste contains gold.