The aqueous solution chlorination method is the earliest applied chemical gold extraction method, and is gradually replaced by a cyanide leaching- zinc replacement precipitation gold extraction process. Due to the high voice of environmental protection in recent years, people have begun to reconsider using this method to extract gold. The principle of this method is to use chlorine as an oxidant in a hydrochloric acid solution to oxidize gold and complex with chloride ions to form AuCl 4 - into the solution. The reaction formula is as follows:
2Au+3Cl 2 +2HCl ==== 2H[AuCl 4 ]
     The gold chloride solution with a reducing agent may be sodium sulfite, ferrous sulfate, sulfur dioxide, and oxalic acid reduction precipitation.
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