Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores

Nava‐Alonso, F.; Elorza-Rodríguez, E.; Uribe‐Salas, A.; Pérez‐Garibay, R.

doi:10.1080/01919510601186410

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…Then, the fine gold particles can be recovered in the subsequent leaching process. This pretreatment process can also eliminate the organic carbon from ore and improve the recovery rate of gold [4][5][6]. At present, the pretreatment technologies used in industrial production mainly include roasting oxidation, pressure oxidation, and biological oxidation [7].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Gold-Bearing Pyrite by Ammonium Persulfate

Tang

Yong

et al. 2021

J. Sustain. Metall.

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Advanced oxidation processes (AOPs) are widely used in water treatment. Thus, we applied an FeSO 4 -S 2 O 8 2− system to the oxidation pretreatment of Carlin-type primary gold ore. Based on this research, we have continued to explore the initiator (nZVI/FeO/FeSO 4 ) in the ammonium persulfate (APS) system. In this study, when the concentration of nano-zero-valent iron (nZVI) was 0.0895 mol/L, the APS concentration was 0.088 mol/L, and the leaching time was 1 h, the oxidation of pyrite reached 92.69%. A quantitative analysis method was established for intermediate SO 4 − •, and it was determined that the concentration of SO 4 − • during the oxidation of pyrite in the nZVI-APS system rapidly increased to 7.533 mmol/L within 7 min, was maintained above 6.5 mmol/L for 7 to 15 min, and then rapidly decreased to 0 mmol/L. Within a certain period of time, the stable concentration of SO 4 − • ensured a rapid increase in the pyrite oxidation rate. The analysis of the oxidized leaching residue shows that the surface of the pyrite in the nZVI(FeO)-APS system had a large specific surface area and a fine particle structure of iron hydroxide oxide (FeOOH), the leaching residue formed depressions and cracks, and the surface area of the pyrite increased, which was conducive to the subsequent contact between leachant and gold. In conclusion, the nZVI(FeO)-APS system can effectively and rapidly oxidize pyrite at room temperature and form a good pulp environment, thereby creating favorable conditions for the subsequent improvement of the gold leaching rate.

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Section: Introductionmentioning

confidence: 99%