In the hydrochloric acid solution, chlorine is used as an oxidant, and the method of oxidizing and dissolving gold is called liquid chlorine extraction, which is also called aqueous solution chlorination.
The chlorination principle is that under the action of the oxidant chlorine gas, gold oxidizes and complexes with chloride ions to form AuCl4- ions into the solution, and the chemical reaction occurs as follows:
2Au+3Cl 2 +2HCl → 2HAuCl 4
Gold chloride solution can be employed in reducing sulfite, ferrous sulfate, sulfur dioxide, oxalic acid and the like gold reduction precipitation, the resulting product up to 99.5% gold.
The liquid chlorine method was used to raise gold long before the cyanidation method was introduced, but it was replaced by the successful application of the cyanidation method. In the past decade or so, due to the rise in gold prices and strict environmental protection requirements, we have reconsidered the use of this method to extract gold and silver .
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