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Treatment for gold ores with high content of carbonaceous matter
Tratamiento para menas auríferas con alto contenido de materia carbonosa
DOI:
https://doi.org/10.15446/dyna.v87n215.84282Palabras clave:
Preg-robbing, cyanidation, surfactant, flotation, carbonaceous matter, activated carbon. (en)Preg-robbing, cianuración, surfactante, flotación, materia carbonosa, carbón activado. (es)
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Gold 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.
Las menas de oro asociadas con materia carbonosa presentan varias dificultades en su extracción 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 cianuración directa. Este fenómeno 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 flotación mineral usando el polímero orgánico maltodextrina como un depresor de la materia carbonosa y un pretratamiento con un surfactante catiónico (cloruro de benzalconio) previa cianuración en conjunto con un proceso de carbón activado en lixiviación (CIL). El porcentaje de preg-robbing (% PR) se redujo del 39.5% inicial al 3.96% en los concentrados de flotación y se logró un máximo de 87.26% de extracción de Au durante la cianuración.
Referencias
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1. Carlos Ocampo-López, Leidy Rendón-Castrillón, Margarita Ramírez-Carmona, Federico González-López. (2024). Evaluation of the Preg-Robbing Effect in Gold Recovery Using the Carbon-in-Leach Technique: A Comparative Study of Three Reactor Types. Metals, 14(12), p.1465. https://doi.org/10.3390/met14121465.
2. Marlen Gómez Santiago, Miguel Ángel Martínez-Ponce, Noemí Ortiz Lara, Ramiro Escudero García, Diana Cholico-González. (2025). Ultrafine grinding of a refractory ore and its effect on the gold and silver leaching. MRS Advances, 10(7), p.868. https://doi.org/10.1557/s43580-025-01110-4.
3. Rahim Ahmadi, Sima Mohammadnejad. (2025). Gold loss during ammonia pre-treatment of a preg-robbing gold ore. Canadian Metallurgical Quarterly, 64(4), p.2427. https://doi.org/10.1080/00084433.2025.2461836.
4. Johannes Vind, Kadriann Tamm. (2021). Review of the extraction of key metallic values from black shales in relation to their geological and mineralogical properties. Minerals Engineering, 174, p.107271. https://doi.org/10.1016/j.mineng.2021.107271.
5. A. V. Byvaltsev, G. I. Voiloshnikov, O. D. Khmelnitskaya. (2025). A procedure for preparing carbonaceous cyanidation tailings for gold fire assay. iPolytech Journal, 29(1), p.123. https://doi.org/10.21285/1814-3520-2025-1-123-132.
6. Abdelkhalek Barbouchi, Mehdi Louarrat, Mohcine Mikali, Laila Barfoud, Moulay Abdellah El Alaoui-Chrifi, Hakim Faqir, Intissar Benzakour, Rachid Idouhli, Mohy-eddine Khadiri, Jaouad Benzakour. (2025). Advancements in improving gold recovery from refractory gold ores/concentrates: a review. Canadian Metallurgical Quarterly, 64(4), p.2370. https://doi.org/10.1080/00084433.2024.2441548.
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