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Extraction of molybdenite concentrates by leaching
Extracción de concentrados de molibdenita por lixiviación
DOI:
https://doi.org/10.15446/dyna.v91n234.115358Palabras clave:
molibdenita, lixiviación, cloruro férrico (es)molybdenite, leaching, ferric chloride (en)
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El concentrado de molibdenita (MoS2) es obtenido actualmente como un subproducto en el procesamiento de minerales provenientes de un pórfido de cobre, siendo la molibdenita considerada un componente menor. El procedimiento para la extracción comercial de molibdeno desde un sulfuro, la molibdenita, implica tostar el concentrado, purificar el calcinado resultante, ya sea por destilación de tiroxido de molibdeno (MoO3 )o por una ruta hidrometalúrgica, y finalmente reducir el trióxido con hidrógeno para obtener el metal
El objetivo del presente trabajo es estudiar la producción de molibdeno desde concentrados de molibdenita usando una solución acuosa de ácido clorhídrico (HCl) como lixiviante, cloruro de sodio (NaCl) como catalizador, hidróxido de sodio (OHNa) como regulador de pH, y por último cloruro férrico (FeCl3) como un oxidante. Los resultados muestran que trabajando en un pH más grande que 8 temperatura de 50ºC, con una concentración de ácido clorhídrico de 5% y una relación solida / liquido de 10:1, velocidad de agitación de 200- 300 rpm y la adición de un 2% de cloruro férrico, La lixiviación de Mo fue del 70% en condiciones experimentales en un tiempo de 180 minutos, con una remoción completa del hierro.
Molybdenum concentrate, as Molybdenite (MoS2), is nowadays obtained as a byproduct of the processing of porphyry copper ores, being molybdenite considered a minor component. The procedure for the commercial extraction of molybdenum from such a sulfide ore, involves the operations of roasting the concentrate, purifying the resulting calcination, either by distillation of molybdenum trioxide (MoO3) or by a hydrometallurgical pathway, and finally reducing the trioxide of molybdenum with hydrogen to obtain the metal.
The objective of the present work is to study the production of molybdenum from molybdenite concentrates using aqueous solution of hydrochloric acid (HCl) as a lixiviant, sodium chloride (NaCl) as a catalyst, sodium hydroxide (NaOH) as a pH regulator, and lastly ferric chloride (FeCl3) as an oxidant. The results show that working pH greater than 8, temperature of 50 °C, hydrochloric acid concentration of 5%, solid/liquid ratio of 10:1, stirring rate of 200-300 rpm and the addition of 2% ferric chloride. Mo leaching was 70% under experimental conditions at a time of 180 minutes, with a complete removal of iron.
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