Study on process mineralogical characteristics and optimization measures for silver during leaching of a high-copper gold concentrate
During the leaching process of silver from a high-copper gold concentrate at a gold smelting company,the issue of"reprecipitation"of silver arises.To investigate the mechanism,process mineralogical characteristics such as silver distribution and dissociation in the high-copper gold concentrate and leach samples were analyzed using scanning electron microscopy and X-ray energy-dispersive spectroscopy.Results indicate that silver primarily exists in acanthite(40.37％)and gold-silver minerals(32.05％),with lower contents in other minerals.During leaching,all silver-bearing minerals except acanthite gradually dissolve,while acanthite appears in the form of"reprecipitation".Silver minerals are mostly associated with sulfide minerals,and sulfoarsenite copper minerals and sulfates form during leaching,with newly formed silver sulfides often associated with them.To address this issue,alkaline pre-leaching tests were conducted.Results show that when lime dosage is 7％,the leaching rates of gold and silver significantly increase,indicating that alkaline leaching effectively reduces interference from sulfur ions on silver leaching and mitigates adverse effects from some mineral impurities on gold leaching.These findings provide robust support for process optimization of similar ores.
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