Abstract
ABSTRACT This study investigates the gold leaching potential of amino acids, focusing on glycine, alanine, and histidine, under various conditions. Results reveal that under alkaline environments, amino acids exhibit gold solubility, with glycine demonstrating superior efficacy compared to alanine and histidine. Strong oxidants like potassium permanganate enhance glycine-induced gold leaching, albeit with partial glycine decomposition. Notably, increasing glycine concentration beyond 0.05 M proves counterproductive. Electrochemical tests affirm that strong alkalinity fosters gold dissolution, with glycine’s dissolution capability peaking at 0.05 M concentration. Conversely, at 0.1 M, glycine’s dissolution efficacy diminishes. At a pH of 13, glycine achieved a gold leaching rate of 84.36% from gold-containing electronic waste. These findings underscore the importance of controlling amino acid concentrations in optimizing gold leaching processes, particularly favoring heap leaching over agitated methods.
Published Version
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