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Treatment for gold ores with high content of carbonaceous matter

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espanolLas menas de oro asociadas con materia carbonosa presentan varias dificultades en su extraccion debido a la capacidad de esta materia para adsorber el complejo aurocianuro de las soluciones ricas… Click to show full abstract

espanolLas menas de oro asociadas con materia carbonosa presentan varias dificultades en su extraccion debido a la capacidad de esta materia para adsorber el complejo aurocianuro de las soluciones ricas en oro, lo que resulta en bajas extracciones de oro por cianuracion directa. Este fenomeno se conoce como preg-robbing. En el presente estudio, se propone un proceso para recuperar efectivamente oro de un mineral altamente carbonoso de Colombia, combinando la flotacion mineral usando el polimero organico maltodextrina como un depresor de la materia carbonosa y un pretratamiento con un surfactante cationico (cloruro de benzalconio) previa cianuracion en conjunto con un proceso de carbon activado en lixiviacion (CIL). El porcentaje de preg-robbing (% PR) se redujo del 39.5% inicial al 3.96% en los concentrados de flotacion y se logro un maximo de 87.26% de extraccion de Au durante la cianuracion. EnglishGold ores associated with carbonaceous matter present several difficulties in their extraction due to the ability of this matter to adsorb the aurocyanide complex from gold pregnant solutions, resulting in low extractions by direct cyanidation. This phenomenon is known as preg-robbing. In the present work, a process to effectively recover Au from a highly carbonaceous ore from Colombia is proposed, combining froth flotation using the organic polymer maltodextrin as a depressant of the carbonaceous matter and a pretreatment with a cationic surfactant (benzalkonium chloride) prior cyanidation in conjunction with activated carbon (CIL). The preg-robbing % (PR%) was reduced from the initial 39.5 % to 3.96 % in the flotation concentrates and a maximum of 87.26 % extraction of Au was achieved during cyanidation.

Keywords: carbonaceous matter; gold ores; treatment gold; matter; preg robbing

Journal Title: Dyna
Year Published: 2020

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