Sphalerite bioleaching comparison in shake flasks and percolators

Schippers, Axel; Tanne, Christoph; Stummeyer, Jens; Graupner, Torsten

doi:10.1016/j.mineng.2018.12.007

Cited by 25 publications

(8 citation statements)

References 27 publications

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“…The pH was adjusted to ≤ 2.0 with H 2 SO 4 (95.0-98.0%) at the beginning of the experiments, but only in conditions where the pH was higher than 2.0. This pH adjustment makes the system comparable with bioleaching processes, where this procedure is commonly reported [28,29]. Solid-liquid separation was carried out using vacuum filtration.…”

Section: Experimental Methodsmentioning

confidence: 99%

Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the Use of Sulfuric Acid and Chloride Solutions

Schueler

Aguiar

Vera

et al. 2021

J. Sustain. Metall.

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The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to evaluate three variables over a 4-h testing period: sulfuric acid concentration (0.01–1.0 mol/L H2SO4), sodium chloride (10–60 g/L NaCl), and temperature (20–70 °C). The design showed two optimum working regions: a combination of a high NaCl level, low H2SO4 level, and medium temperature level for lead leaching, while for copper and zinc, a combination of a medium–high H2SO4 level and a high temperature level. The concentration of NaCl had only a slight impact on their leaching. Based on these results, two-stage leaching was performed. The first stage was carried out under an experimental condition that favored the leaching of lead (60 g/L NaCl, 0.01 mol/L H2SO4, 45 °C, 1 h, 10:1 liquid-to-solid ratio), whereas the second stage maximized the leaching of copper and zinc (60 g/L NaCl, 0.5 mol/L H2SO4, 70 °C, 24 h, 10:1 liquid-to-solid ratio). The global leaching rate was 66.8 ± 3.0% copper, 84.1 ± 5.2% zinc, and 93.9 ± 3.2% lead. The iron and arsenic content were also leached by about 20 and 50% at the end of the second stage. The study demonstrated that the use of sulfate–chloride media in a two-stage leaching considerably improved the extraction of the desired metals and was, therefore, suitable for their recovery. Graphical Abstract

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Section: Experimental Methodsmentioning

confidence: 99%

Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the Use of Sulfuric Acid and Chloride Solutions

Schueler

Aguiar

Vera

et al. 2021

J. Sustain. Metall.

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show abstract

“…The results showed that the zinc bioleaching rate was about 97.38% after 50 days at 10% pulp density, which obeyed the shrinking core model [16]. Bioleaching experiments using mixed acidic Thiobacillus found that the redox potential was higher than that of the chemical control method [17]. It can be seen that the bioleaching method is suitable for the treatment of zinc sulfide ores.…”

Section: Introductionmentioning

confidence: 80%

Analysis of bioleaching characteristics and multi-element dissolution behavior of complex zinc ores

Li,

Qiu,

Qiu

et al. 2024

J. Phys.: Conf. Ser.

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In order to recover low-grade complex zinc ore in a reasonable way, this study adopts bioleaching method to study it. The ore samples contain 1.52%, 2.03% and 14.4% zinc, respectively, which occurs in the form of sphalerite. Other major minerals include pyrite, galena, quartz and mica. The inoculation of the domesticated strain was basically free of adaptation period, and the cell concentration could be rapidly increased after a short decrease. The leaching extent of zinc increased continuously, while the leaching rate decreased gradually. After the bioleaching process, sliver, lead and iron were mainly present in the residue phase. X-ray diffraction spectroscopy analysis showed that sphalerite, galena and pyrite were dissolved, and the latter two further precipitated to produce PbSO4 and jarosite. In addition, the dissolution of calcium compounds can lead to the formation of gypsum precipitation. These precipitates covered the fresh ore surface may hinder the further bioleaching process. The Exponential model was used to simulate the bioleaching process, and it was found that the fit coefficients were all greater than 0.98, and a reasonable leaching cycle was further discussed. The results provide a good basis for the economic and environmentally friendly recovery of low-grade complex zinc ores.

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“…Genuses in bioleaching unacclimated acclimated Microbe adhere on the mineral particles by the extracellular polymeric substance (EPS) to oxidize the sulfides in zinc-bearing lead concentrate [11]. There are many substrates on which Acidiphilium strains act, including S 2in sulfides, element S, ferrous iron and other materials [12][13][14].…”

Section: Elemental Analysis By Xrf and Icp-oesmentioning

confidence: 99%

Study on bioleaching behavior of sphalerite from lead concentrate in agitator tank

Xue,

Jianzhi,

Shuang

et al. 2024

J. Phys.: Conf. Ser.

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Sphalerite which is highly continuous with galena cannot be effectively separated by flotation, the extraction of zinc from sphalerite in bioleaching process has become an alternative method. By testing the initial iron concentration, pulp density, grinding fineness and other parameters as well as monitoring pH, potential and dissolved oxygen, the zinc content of the lead concentrate decreased from 8.41% to less than 1% after bioleaching in 8L agitator tank. The initial concentration of ferric is the most significant factor affecting the zinc extraction efficiency of sphalerite, and when the concentration of ferric ions reaches 9g/L, acceptable leaching yield can be achieved.

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Sphalerite bioleaching comparison in shake flasks and percolators

Cited by 25 publications

References 27 publications

Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the Use of Sulfuric Acid and Chloride Solutions

Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the Use of Sulfuric Acid and Chloride Solutions

Analysis of bioleaching characteristics and multi-element dissolution behavior of complex zinc ores

Study on bioleaching behavior of sphalerite from lead concentrate in agitator tank

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