On the optimization of sphalerite bioleaching; the inspection of intermittent irrigation, type of agglomeration, feed formulation and their interactions on the bioleaching of low-grade zinc sulfide ores

2012 ◽  
Vol 187 ◽  
pp. 217-221 ◽  
Author(s):  
Taghiyeh Saririchi ◽  
Reza Roosta Azad ◽  
Daryush Arabian ◽  
Asghar Molaie ◽  
Fahimeh Nemati
Keyword(s):  
Zinc Sulfide ◽  
Low Grade ◽  
Sulfide Ores ◽  
Feed Formulation ◽  
Intermittent Irrigation

scholarly journals Distinct Roles of Acidophiles in Complete Oxidation of High-Sulfur Ferric Leach Product of Zinc Sulfide Concentrate

2020 ◽  
Vol 8 (3) ◽  
pp. 386 ◽  
Author(s):  
Maxim Muravyov ◽  
Anna Panyushkina
Keyword(s):  
Microbial Community ◽  
Zinc Sulfide ◽  
Elemental Sulfur ◽  
Waste Product ◽  
Sulfur Oxidation ◽  
Low Grade ◽  
Sulfide Concentrates ◽  
Sulfide Concentrate ◽  
Elemental Sulfur Oxidation ◽  
Ferric Leaching

A two-step process, which involved ferric leaching with biologically generated solution and subsequent biooxidation with the microbial community, has been previously proposed for the processing of low-grade zinc sulfide concentrates. In this study, we carried out the process of complete biological oxidation of the product of ferric leaching of the zinc concentrate, which contained 9% of sphalerite, 5% of chalcopyrite, and 29.7% of elemental sulfur. After 21 days of biooxidation at 40 °C, sphalerite and chalcopyrite oxidation reached 99 and 69%, respectively, while the level of elemental sulfur oxidation was 97%. The biooxidation residue could be considered a waste product that is inert under aerobic conditions. The results of this study showed that zinc sulfide concentrate processing using a two-step treatment is efficient and promising. The microbial community, which developed during biooxidation, was dominated by Acidithiobacillus caldus, Leptospirillum ferriphilum, Ferroplasma acidiphilum, Sulfobacillus thermotolerans, S. thermosulfidooxidans, and Cuniculiplasma sp. At the same time, F. acidiphilum and A. caldus played crucial roles in the oxidation of sulfide minerals and elemental sulfur, respectively. The addition of L. ferriphilum to A. caldus during biooxidation of the ferric leach product proved to inhibit elemental sulfur oxidation.

scholarly journals Oxidative Roasting of Low Grade Zinc Sulfide Concentrate from Gagok Mine in Korea

2010 ◽  
Vol 51 (8) ◽  
pp. 1481-1485 ◽  
Author(s):  
Byung-Su Kim ◽  
Soo-Bock Jeong ◽  
Young-hun Kim ◽  
Hyung-Seok Kim
Keyword(s):  
Zinc Sulfide ◽  
Low Grade ◽  
Oxidative Roasting ◽  
Sulfide Concentrate

scholarly journals Fluidized Roasting of Low Grade Sulfide Ores

1960 ◽  
Vol 63 (6) ◽  
pp. 912-918
Author(s):  
Kazutoyo Hirose ◽  
Isamu Yano ◽  
Shogo Mikami
Keyword(s):  
Low Grade ◽  
Sulfide Ores

scholarly journals Effect of Magnesium on the Hydrophobicity of Sphalerite

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1359
Author(s):  
Gloria I. Dávila-Pulido ◽  
Adrián A. González-Ibarra ◽  
Mitzué Garza-García ◽  
Danay A. Charles
Keyword(s):  
Contact Angle ◽  
Zeta Potential ◽  
Zinc Sulfide ◽  
Sodium Carbonate ◽  
Thermodynamic Simulation ◽  
Bulk Solution ◽  
Sulfide Ores ◽  
Recycled Water ◽  
Negative Effects ◽  
Dissolved Species

The use of untreated recycled water has negative effects in the flotation of zinc sulfide ores due to the presence of dissolved species, such as magnesium and calcium. Although it has been found that magnesium is a more potent depressant than calcium, it has not been investigated in this role or for the effect of adding sodium carbonate. The results of an investigation to evaluate the effect of magnesium on the hydrophobicity of Cu-activated sphalerite conditioned with Sodium Isopropyl Xanthate (SIPX) are presented. Zeta potential of natural and Cu-activated sphalerite as a function of the conditioning pH and Cu(II) concentration, respectively, was first evaluated. Later, the effect of pH and presence of magnesium on the contact angle of Cu-activated sphalerite conditioned with SIPX was studied; it was also evaluated the effect of sodium carbonate to counteract the effect of magnesium. Cu-activation enhances the zeta potential of sphalerite up to a concentration of 5 mg/L. Contact angle tests, thermodynamic simulation, and surface analysis showed that magnesium hydroxide precipitates on the sphalerite surface at pH 9.6, decreasing its hydrophobicity. Addition of sodium carbonate as alkalinizing agent precipitates the magnesium in the form of a species that remained dispersed in the bulk solution, favoring the contact angle of Cu-activated sphalerite and, consequently, its hydrophobicity. It is concluded that the use of sodium carbonate as alkalinizing agent favors the precipitation of magnesium as hydromagnesite (Mg5(OH)2(CO3)4∙4H2O) instead of hydroxide allowing the recovery of sphalerite.

Biomining Microorganisms' Molecular Aspects and Applications in Biotechnology and Bioremediation

2018 ◽  
pp. 1-18
Author(s):  
Jyoti Srivastava ◽  
Pradeep Srivastava
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Low Grade ◽  
Sulfide Ores ◽  
Genomics And Proteomics ◽  
Industrial Operations ◽  
Biotechnological Processes ◽  
Acidic Environments ◽  
Molecular Aspects ◽  
Extraction Of Metals

The effective dissolution of metals is widely known with the help of microorganisms called bioleaching or biomining used for the extraction of metals from their ores. Usually the microorganisms involved in biomining are chemolithoautotrophic and extremophilic in nature, since they are living in highly acidic environments (pH 1-3.0) containing heavy concentrations of metals. The commonly found genera of archea are Sulfolobus, Acidianus, Metallosphaera, and Sulfurisphaera. Throughput microbial genomics and proteomics analysis provides novel insights of metabolism mechanisms of bioleaching microbes. These microbes are having significant impact on the bioremediation of acid mine drainage (AMD) resulted from many industrial operations. Using these microbes, various metals including Ni, Cd, Cu, Fe, As, Pb, Hg, Cr, Mn, Zn, etc. are removed from the environment. Biomining microorganisms are having significant applications in the biotechnological processes including extraction of gold from ores, extraction of nickel from low-grade sulfide ores, extraction of copper from chalcopyrite, etc.

Bioleaching of zinc from low-grade complex sulfide ores in an airlift by isolated Leptospirillum ferrooxidans

2007 ◽  
Vol 89 (1-2) ◽  
pp. 117-126 ◽  
Author(s):  
A. Giaveno ◽  
L. Lavalle ◽  
P. Chiacchiarini ◽  
E. Donati
Keyword(s):  
Low Grade ◽  
Sulfide Ores ◽  
Leptospirillum Ferrooxidans ◽  
Complex Sulfide

The Enhancing Effect of Microwave Irradiation and Ultrasonic Wave on the Recovery of Zinc Sulfide Ores

2017 ◽  
Vol 36 (6) ◽  
pp. 587-591
Author(s):  
Kun Yang ◽  
Libo Zhang ◽  
Chao Lv ◽  
Shiwei Li ◽  
Jinhui Peng ◽  
...  
Keyword(s):  
Zinc Sulfide ◽  
Ultrasonic Wave ◽  
Molar Ratio ◽  
Wave Power ◽  
Sulfide Ores ◽  
Reaction Energy ◽  
Liquid Ratio ◽  
Before And After ◽  
Total Ammonium ◽  
Xrd Patterns

AbstractA novel process for the treatment of zinc sulfide ores is discussed in this paper, which consists of two procedures: microwave roasting pretreatment and synergistic chelation. What’s more, the reaction mechanism also has been studied. By comparing XRD patterns before and after roasting, it can be concluded that microwave truly alleviates the reaction energy, and adding Na2O2 avoids the emission of SO2. % recovery of zinc can reaches 72.47 % on conditions of adding Na2O2 25 %, microwave activating temperature 500 °C, holding time 10 min, leaching temperature 40 °C, ultrasonic wave power 1,800 W, leaching time 4.5 h and solid to liquid ratio 10:1 in ammonium chloride solution whose total ammonium concentrate is 7.5 mol/L (c(NH3)T=7.5 mol/L). The molar ratio of NH4Cl and NH3·H2O is 1:1 (c(NH4Cl): c(NH3·H2O)=1:1). The effect of ultrasonic wave power in this process is to shorten reaction time.

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