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In this tutorial, the speaker discusses the process of extracting gold from old mobile phones. Each mobile phone contains gold connectors, which are valuable for transmitting digital data efficiently. By using sulfuric acid and nitric acid-water mixture, the gold can be extracted from the devices. The remaining metals can be stripped away using the nitric acid-water mixture, and the precious metals can be separated using a flux like cyanide of potash. The process requires careful handling and washing of the residue with hot water.
