Efecto de la velocidad de agitación en la cinética de lixiviación con tiourea de minerales flotados de oro

Hugo Italo Romero Bonilla; Ricardo Guerrero Rodríguez; María Mora Morocho

doi:10.14482/inde.38.1.531.3

Authors

Hugo Italo Romero Bonilla UNIVERSIDAD TÉCNICA DE MACHALA
Ricardo Guerrero Rodríguez Empresa Hidrometalúrgica Franromec S. A
María Mora Morocho Universidad Técnica de Machala

DOI:

https://doi.org/10.14482/inde.38.1.531.3

Keywords:

Concentrate, Green chemistry, Gold, Kinetics, Leaching, Thiourea

Abstract

In this work, the effect of the agitation speed on the thiourea kinetics with thiourea of gold-floated minerals, the concentration of thiourea (TU) that achieved the greatest recovery of gold from its floated concentrates compared with cyanide was determined, In addition, the kinetic model that controls leaching with thiourea. For this, a “Suction tube” type Baffled reactor is used with mechanical agitation by means of a vane type impeller. The parameters analyzed were: percentage of solids (15 %); TU concentration (1, 3, 6, 9, 12 g/L); stirring speed (420, 490, 560, 700 rpm); reaction time (4 h); effective reactor capacity (27.1 L). An atomic absorption spectrophotometer is estimated to determine the gold concentration. It was determined that the thiourea concentration of 9 g / L was the one that produced the best gold recovery results. The thiourea leaching process adapts to the kinetic diffusion model through the ash layer as a controlling stage. Thiourea, as a leaching agent of the Au concentrate, has a lower percentage (1.74 % less) of recovery of this metal than with cyanide during the leaching process at 240 m of stirring at a stirring speed of 700 rpm.

Author Biography

Hugo Italo Romero Bonilla, UNIVERSIDAD TÉCNICA DE MACHALA

Jefe de laboratorio de Electroanalítica y Bioenergía, Carrera de Ingeniería Química, Universidad Técnica de Machala

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