Metal sulfide precipitation coupled with membrane filtration process for recovering copper from acid mine drainage

Menzel, Katherine; Barros, Lorena; Garcia, Amauri; Ruby‒Figueroa, René; Estay, Humberto

doi:10.1016/j.seppur.2021.118721

Cited by 57 publications

(23 citation statements)

References 70 publications

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“…On another note, the application of a chemical source of sulfide has been used to study the selective recovery of metals [10] and the understanding [16] or optimization of solid-liquid separation of precipitates [20]. Selective precipitation of copper and zinc, after a rare earth elements (REEs) recovery stage, was proposed by Zhang and Honaker [10] using a 1 M Na 2 S solution at different pH values.…”

Section: Acid Mine Drainages (Amd)mentioning

confidence: 99%

“…Recent applications of membrane filtration processes, specifically microfiltration (MF), to clarify copper sulfide precipitates produced in cyanide media [53] and AMD [20] have been reported (Figure 9). Furthermore, a mix of copper and zinc sulfide from a real cyanide solution of a gold mine was processed by MF [50].…”

Section: Latest Breakthroughs In Solid-liquid Separationmentioning

confidence: 99%

“…Furthermore, a mix of copper and zinc sulfide from a real cyanide solution of a gold mine was processed by MF [50]. Using feed pressure of slurries slower than 2 bar, flux values of 0.1 to 1.4 L/m 2 s were reached for copper sulfide and Cu/Zn sulfides in cyanide media [50,53] and 0.1 L/m 2 s for copper sulfide in AMD [20]. The lowest flux for cyanide media was reached for a low copper concentration (200 mg/L) or under the presence of Zn, a fact that in both cases can be explained by the small particle size generated in the reactor.…”

Section: Latest Breakthroughs In Solid-liquid Separationmentioning

confidence: 99%

“…The development of alternative unit operations for the conventional gravitational clarifiers could thus be an interesting route to limit the impact of precipitates' behavior, and, consequently, to reduce the equipment size and capital costs [20,50,53].…”

Section: Solid-liquid Separationmentioning

confidence: 99%

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Metal Sulfide Precipitation: Recent Breakthroughs and Future Outlooks

2021

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The interest in metal sulfide precipitation has recently increased given its capacity to efficiently recover several metals and metalloids from different aqueous sources, including wastewaters and hydrometallurgical solutions. This article reviews recent studies about metal sulfide precipitation, considering that the most relevant review article on the topic was published in 2010. Thus, our review emphasizes and focuses on the overall process and its main unit operations. This study follows the flow diagram definition, discussing the recent progress in the application of this process on different aqueous matrices to recover/remove diverse metals/metalloids from them, in addition to kinetic reaction and reactor types, different sulfide sources, precipitate behavior, improvements in solid–liquid separation, and future perspectives. The features included in this review are: operational conditions in terms of pH and Eh to perform a selective recovery of different metals contained in an aqueous source, the aggregation/colloidal behavior of precipitates, new materials for controlling sulfide release, and novel solid–liquid separation processes based on membrane filtration. It is therefore relevant that the direct production of nanoparticles (Nps) from this method could potentially become a future research approach with important implications on unit operations, which could possibly expand to several applications.

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Section: Acid Mine Drainages (Amd)mentioning

confidence: 99%

Section: Latest Breakthroughs In Solid-liquid Separationmentioning

confidence: 99%

Section: Latest Breakthroughs In Solid-liquid Separationmentioning

confidence: 99%

Section: Solid-liquid Separationmentioning

confidence: 99%

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Metal Sulfide Precipitation: Recent Breakthroughs and Future Outlooks

2021

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“…Recently, a membrane filtration process coupled with metal sulfide precipitation was proposed to recover copper from cyanide solutions [9] and from acid mine drainage (AMD) [10], obtaining permeate fluxes (i.e., separation rates) between 0.1 L/m 2 s and 1.4 L/m 2 s for different copper concentrations and operational conditions. These values and the compact design of membrane modules significantly reduce the residence time of the solid-liquid separation stage, from 90-120 min to less than 5 s, compared to a conventional thickener used in the SART process [11].…”

Section: Introductionmentioning

confidence: 99%

Integrated Membrane Process Coupled with Metal Sulfide Precipitation to Recover Zinc and Cyanide

et al. 2022

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In gold cyanidation plants, which include a zinc cementation process, there is a progressive increase in zinc content in the solution and a higher cyanide concentration in leaching tailings. Consequently, there are opportunities to: (i) recover zinc and cyanide from these solutions, (ii) generate a saleable ZnS by-product, and (iii) reduce cyanide consumption and cyanide concentration in leaching tailings. Previous studies have proposed the use of the SART (Sulfidization, Acidification, Recycling, and Thickening) process for this purpose; however, this process has disadvantages that must be addressed. This study presents the results of the experimental assessment of an alternative process, the SuCy process, which uses an integrated membrane process. The SuCy process is composed of a metal sulfide precipitation coupled with a membrane filtration stage, a membrane contactor step to recover and concentrate cyanide, and a final neutralization and ultrafiltration stage. The flux obtained for zinc sulfide separation was around 0.01 L/m2s, with cyanide recovery of 95% at 60 min, whereas flux for ultrafiltration was 0.22 L/m2s. A comparison with an experimental study of the SART process at laboratory scale showed that the SuCy process could obtain a higher zinc recovery and can reduce the solid–liquid separation equipment by around five times. Therefore, the SuCy process could be a promising alternative for zinc and cyanide recovery in gold cyanidation.

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