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Extracting Gold from Difficult-to-Leach Ores

     

The Method of Simultaneous Leaching with Chloride-Oxidized Complex for Extracting Gold from Difficult-to-Leach Ores: This method falls under wet metallurgical techniques.

First, the ore is shattered into particles and mixed with sodium hydroxide (NaOH), sodium hypochlorite (NaClO), and water to form a slurry. Air is then introduced into the slurry under stirring conditions to enhance leaching efficiency through ultrasonic assistance.

During the enhanced leaching process, hydrogen peroxide (H2O2) is periodically added. The cooperative effect between NaOH and hydrogen peroxide significantly enhances the oxidation-reduction reaction, enabling faster gold extraction while minimizing reagent costs. This method achieves a gold leaching rate of over 98%, eliminates potential environmental impacts from sodium hypochlorite, and shortens the overall leaching process in a single step.

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