Lixiviación asistida con ultrasonido como método de mayor ecoeficiencia en el procesamiento de minerales: extracción mejorada de plata de un concentrado basado en sulfuros sin consumir más cianuro
DOI:
https://doi.org/10.71701/x4fw7652Keywords:
Leaching, ultrasound, sonication, silver, cyanideAbstract
Improving the efficiency of noble metal extraction without increasing the consumption of the leaching agent is one of the goals in the development of novel hydrometallurgical routes. This is particularly important when dangerous compounds (such as cyanide) are involved in mineral processing. Ultrasound-assisted leaching is presented here as an advantageous process able to increase the amount of silver leached from a polymetallic sulfide-based mineral by ~300%, without increasing cyanide consumption. Our results suggest that sonication removes solid by-products that hinder the leaching process. While in the absence of sonication cyanide consumption rises steadily even though silver leaching has reached a maximum, under sonication both cyanide consumption and silver extraction follow similar trends, indicating that side reactions are decreased. The enhanced efficiency in both silver extraction and cyanide consumption indicate that ultrasound-assisted leaching can be introduced as a greener method in mineral processing.
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