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Studies Tan et al. 2017 have shown that 1 ton of waste mobile phone printed circuit boards WMPCBs contain 0.86–1.6 kg of gold 0.14–5.8 kg of silver and 259–550 kg of copper and the amount of gold recovered from waste mobile phones can meet nearly 10 of the global electronics manufacturing industry s demand for gold.
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You use thin solder for detailed work like putting resistors onto circuit boards and thicker solder for joining larger materials like speaker wire. I use solder around .025 for most jobs. Most solder is made from a combination of tin and leadit s about a 60 tin 40 lead mix depending on what solder your using.
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