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Leaching refractory gold ores

     

Method for Synergistic Chlorination-Oxidation Leaching of Gold from Refractory Gold Ore:

This method for synergistic chlorination-oxidation leaching of gold from refractory gold ore belongs to the field of hydrometallurgy.

First, crush the gold ore into ore powder; fully mix the ore powder, sodium hydroxide, sodium hypochlorite and water to obtain ore slurry; introduce air into the slurry, and perform ultrasonic-enhanced leaching under stirring conditions.

During the enhanced leaching process, hydrogen peroxide is added periodically. The synergistic effect of hydrogen peroxide and sodium hydroxide is utilized to carry out redox reactions—their combined oxidation effect far exceeds that of either agent alone. 

This not only shortens the reaction time but also improves gold leaching efficiency, saving reagent costs while boosting overall ore leaching performance. The leaching rate can reach over 98% using this method. Using sodium hypochlorite as the leaching agent does not impose environmental pressure; additionally, this invention adopts a one-step enhanced leaching process, simplifying the leaching workflow.

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