Naslov (eng)

Combination of chemical and bioleaching process for Cu and Zn recovery from the Sedex type ore

Autor

Conić, Vesna
Dragulović, Suzana
Božić, Dragana
Milanović, Dragan
Jovanović, Ivana
Stanković, Srđan
Avdalović, Jelena

Opis (eng)

Abstract: The “Two Stage Leaching Process” described in this paper consists of the classic acid leaching followed by a bioleaching step. Acid leaching serves to leach the oxide minerals, but when O2 is introduced as an oxidant, a partial oxidation of sulfide minerals is expected. Bioleaching serves to leach the sulfide minerals. The use of the two-stage leaching process could increase the metal recoveries of partially exploited or un-exploited ore, such as: standard and polymetallic ore containing sulfide, mixed sulfide and oxide minerals; the Sedex ore, such as the sulfide types of ore with very fine impregnated mineral structures; ore containing harmful elements such us As, Hg and Cd. To ensure the maximum metal recovery from minerals such as chalcopyrite during the tank bioleaching processes, fine grinding of sample to the particle sizes between 10 and 20 μm is often required. Acid leaching in combination with bioleaching could result in the improved exposure of mineral surfaces to the leaching reagents resulting in deeper and easer bacterial attack on sulfide minerals. Due to this reason, the good metal recoveries could be achieved for a grain size of 80% < 30 μm. The ability to operate at a larger particle size could lead to the energy saving and lower consumption of balls during the milling step. It was shown that a combination of acid leaching and bioleaching “Bobija” polymetallic type of ore resulted in the higher Cu and Zn recoveries than what could be achieved using either the bioleaching or bioleaching followed by the acid leaching. Since the Fe extraction is significantly lower using this process, the Cu and Zn losses will be substantially lower as a result of Fe co-precipitation. Solutions, obtained by the chemical leaching and bioleaching, can be combined and after iron precipitation be treated by the solvent extraction and electrowinning.

Jezik

engleski

Datum

2022

Licenca

© All rights reserved

Predmet

Keywords: polymetallic ore, Sedex type ore, acid leaching, bioleaching, At. ferrooxidans.

Deo kolekcije (1)

o:179

Institut za rudarstvo i metalurgiju Bor