Electrochemical Behavior of Ocean Polymetallic Nodules and Low-Grade Nickel Sulfide Ore in Acidithiobacillus Ferrooxidans-Coupled Bio-Leaching

Efficient extraction of Ni, Co, Cu, and Mn from low-grade and refractory ores is a common technical challenge. The present study proposes an Acidithiobacillus ferrooxidans-coupled leaching of Ni, Cu, Co, and Mn from oceanic polymetallic nodules and low-grade nickel sulfide ore, and focuses on the electrochemical behavior of the ores in simulated bio-leaching solutions. In the dissolution of polymetallic nodules, A. ferrooxidans facilitates the diffusion of H+ and accelerates electron transfer, producing a decrease in charge transfer resistance and promoting the Mn(IV)-preceding reaction. The use of A. ferrooxidans is beneficial for lower impedance of sulfur-nickel ore, faster diffusion rate of product layer, and better transformation of the Fe3+/Fe2+ couple and S0/S2− couple. A. ferrooxidans increases the potential difference between the nodule cathode and sulfide anode, and increases electron liberation from the sulfide ore. This motivates a significant increase in the average extraction rates of Ni, Co, Cu, and Mn in the bacterial solution. The bio-leaching efficiencies of Ni, Co, Cu, and Mn were as high as 95.4%, 97.8%, 92.2% and 97.3%, respectively, representing improvements of 17.1%, 11.5%, 14.3% and 12.9% relative to that of the germ- and Fe(III)-free acidic 9 K basic system.

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Acidithiobacillus ferrooxidans: performances on the low-grade polymetallic oxidized-manganese and sulfur-nickel ores redox system

Metallurgical Research & Technology ◽

10.1051/metal/2018019 ◽

2018 ◽

Vol 115 (6) ◽

pp. 601

Author(s):

Kang Jin-xing ◽

Feng Ya-li ◽

Li Hao-ran ◽

Du Zhu-wei ◽

Deng Xiang-yi ◽

...

Keyword(s):

Acidithiobacillus Ferrooxidans ◽

Nickel Sulfide ◽

Redox System ◽

Low Grade ◽

Selective Leaching ◽

Polymetallic Nodule ◽

Sulfide Ore ◽

Nickel Ores ◽

Electron Release ◽

Sulfur Containing

A simultaneous bioleaching process to extract nickel, cobalt, copper and manganese from polymetallic nodule and low-grade nickel sulfide ore by using Acidithiobacillus ferrooxidans is proposed in this study. Thermodynamic investigations and potential analysis showed that the selective leaching of Ni, Co, Cu, Mn is feasible. The electrochemical measurements reveal that A. ferrooxidans increases the potential difference between nodule anode and sulfide cathode. A. ferrooxidans leads to the negative shift of corrosion potential and the increment in electron release of the sulfur-containing substance, and accelerates the electron transfer and exchange current density in the nodule digestion. Under the optimal conditions, in the presence of A. ferrooxidans the final pregnant solution contained 0.86 g Ni/L, 56 mg Co/L, 0.62 g Cu/L, and 5.81 g Mn/L with the improvement of 5.1%, 4.1%, 5.9% and 4.9% referring to operation with sterile solution. The leaching rate of Ni, Cu, Co and Mn increases respectively by a factor of 0.17, 0.48, 0.10, and 0.093 in the A. ferrooxidans and Fe(III) medium relative to the Fe(III) alone, with a mean of 0.91, 0.70, 0.34 and 0.45 to the control.

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Leaching of a low-grade, copper–nickel sulfide ore

Hydrometallurgy ◽

10.1016/j.hydromet.2009.03.016 ◽

2009 ◽

Vol 98 (1-2) ◽

pp. 66-72 ◽

Cited By ~ 13

Author(s):

M. Maley ◽

W. van Bronswijk ◽

H.R. Watling

Keyword(s):

Nickel Sulfide ◽

Low Grade ◽

Copper Nickel ◽

Sulfide Ore

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Investigation of Bioleaching of a Low Grade Nickel-Cobalt-Copper Sulfide Ore with High Magnesium as Olivine and Serpentine from Lao

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.825.396 ◽

2013 ◽

Vol 825 ◽

pp. 396-400 ◽

Cited By ~ 2

Author(s):

Bo Wei Chen ◽

Liu Lu Cai ◽

Biao Wu ◽

Xue Liu ◽

Jian Kang Wen

Keyword(s):

Copper Sulfide ◽

Nickel Sulfide ◽

Low Grade ◽

Nickel Cobalt ◽

Nickel Silicate ◽

Copper Leaching ◽

Sulfide Ore ◽

Initial Ph ◽

Copper Sulfide Ore ◽

Cobalt Copper

Shake flask bioleaching of a low-grade nickel-cobalt-copper sulfide ore from Lao was investigated to test the technical feasibility to recovery metals from this ore. The mineralogical results indicated that the valuable minerals were disseminated finely and the ore had a low content of sulfur and high content of iron and magnesium, which was very harmful for bioleaching. The effects of different parameters such as the amount of acid addition, inoculation volume, initial pH, temperature and leaching time on the bioleaching performance of the ore were evaluated after pre-leaching with dilute acid. The results showed that nickel, cobalt, copper leaching rates reached 81.61%, 80.75%, 70.97% at 33 °C and 83.40%, 82.13%, 70.34% at 45 °C. The mineralogical analysis of the leaching residues revealed that the leaching rate of nickel sulfide was more than 92% and the unleached nickel was mainly present as nickel silicate.

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Effect of soluble sulfur species on the electrochemical behavior of lithium–sulfur batteries with dual-phase electrolytes

Sustainable Energy & Fuels ◽

10.1039/c9se00291j ◽

2019 ◽

Vol 3 (8) ◽

pp. 1966-1970 ◽

Cited By ~ 2

Author(s):

Chengcheng Zhao ◽

Hao Yang ◽

Xiaofei Wang ◽

Huilan Li ◽

Chu Qi ◽

...

Keyword(s):

Charge Transfer ◽

Reaction Kinetics ◽

Electrochemical Behavior ◽

Charge Transfer Resistance ◽

Dual Phase ◽

Transfer Resistance ◽

Sulfur Species ◽

Lithium Sulfur Batteries ◽

Interfacial Charge ◽

Lithium Sulfur

We report a Li–S system with dual-phase electrolytes by taking advantage of the highly soluble lithium polysulfides (Li2Sn, 2 < n ≤ 8), and it shows an improved reaction kinetics associated with a low interfacial charge transfer resistance.

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Effect of dip time on the electrochemical behavior of PPy-Cu(OH)2 hybrid electrodes synthesized using pyrrole and CuSO4

e-Polymers ◽

10.1515/epoly-2016-0160 ◽

2017 ◽

Vol 17 (2) ◽

pp. 167-173 ◽

Cited By ~ 11

Author(s):

Amarsingh V. Thakur ◽

Balkrishna J. Lokhande

Keyword(s):

Specific Capacitance ◽

Electrochemical Behavior ◽

Charge Transfer Resistance ◽

Specific Power ◽

Data Card ◽

Sem Images ◽

Transfer Resistance ◽

X Ray ◽

Hybrid Energy ◽

Warburg Impedance

AbstractThe present work in on the successive ionic layer adsorption and reaction (SILAR) mediated synthesis and study of variations in electrochemical behavior of PPy-Cu(OH)2 hybrid electrodes with dip time. In the aqueous route preparation, 0.1 m pyrrole, 0.1 m CuSO4 dissolved in acidified water (using 0.5 m H2SO4) and H2O2 (30 wt %) were used as initial ingredient sources. The peaks observed in the X-Ray diffraction (XRD) pattern of the electrode at 2θ=21.500 oriented along the <110> planes closely match with the peaks of Cu(OH)2 as per JCPDS data card no. 42-0638 indicating the existence of triclinic Cu(OH)2 in the hybrid. The characteristic peak at 1559 cm−1 in the Fourier transform infrared (FTIR) spectrum due to pyrrole ring vibrations confirms the existence of PPy in the hybrid. Energy-dispersive X-ray (EDX) analysis shows the occurrence of C, N, O and Cu in the electrode material which substantiates the formation of the hybrid. The scanning electron microscopy (SEM) images of electrodes with optimum dip time (20 s) in pyrrole show networks of interconnected nanostructures. The specific capacitance increases with the dip time in the source solutions. The electrode prepared with optimum dip time in pyrrole has produced the maximum values of specific capacitance (SC), specific energy (SE) and specific power (SP) as 127.04 F/g, 44.16 Wh/kg and 30 kW/kg, respectively, when analyzed in 0.5 m H2SO4. Impedance study of the electrode explains the mixed capacitive nature and the maximum values of solution resistance (Rs), charge transfer resistance (Rct) and Warburg impedance (Rw) are 1.35 Ω, 143.4 Ω and 2.05 Ω, respectively.

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Leaching of a low-grade, copper–nickel sulfide ore. 3. Interactions of Cu with selected sulfide minerals

Hydrometallurgy ◽

10.1016/j.hydromet.2009.03.015 ◽

2009 ◽

Vol 98 (1-2) ◽

pp. 73-80 ◽

Cited By ~ 13

Author(s):

M. Maley ◽

W. van Bronswijk ◽

H.R. Watling

Keyword(s):

Nickel Sulfide ◽

Sulfide Minerals ◽

Low Grade ◽

Copper Nickel ◽

Sulfide Ore

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Nickel Bioleaching at Elevated pH: Research and Application

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.262.197 ◽

2017 ◽

Vol 262 ◽

pp. 197-201 ◽

Cited By ~ 1

Author(s):

Jian Zhi Sun ◽

Bo Wei Chen ◽

Jian Kang Wen ◽

Biao Wu

Keyword(s):

Nickel Sulfide ◽

Industrial Applications ◽

Low Grade ◽

Sulfide Ores ◽

Leaching Rate ◽

Sulfide Deposits ◽

Acid Consumption ◽

Sulfide Ore ◽

The Cost ◽

Experimental Researches

Biohydrometallurgy has broad application prospect in the treatment of low-grade nickel sulfide ore. However, quite a number of nickel sulfide deposits are associated with basic gangue minerals such as contain olivine, serpentine. The high basic gangue minerals will lead to a higher acid consumption and make it difficult to bioleach at pH below 2.5. It is crucial to improve processes and adapt bacteria with this kind of ore. This paper reviews the experimental researches and industrial applications for bioleaching of the high acid consumption nickel sulfide ores. It is suggested that bioleaching at elevated pH will have similar leaching rate compared with pH below 2.5, meanwhile the cost will be decreased remarkably due to a lower acid consumption and less dissolved impurity ions.

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Application of three xanthates collectors on the recovery of nickel and pentlandite in a low-grade nickel sulfide ore using optimum flotation parameters

Particulate Science And Technology ◽

10.1080/02726351.2016.1165324 ◽

2016 ◽

Vol 35 (4) ◽

pp. 462-471 ◽

Cited By ~ 3

Author(s):

B. D. Ikotun ◽

F. V. Adams ◽

A. G. Ikotun

Keyword(s):

Nickel Sulfide ◽

Low Grade ◽

Sulfide Ore

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Electrochemical behavior of hydrogen precipitated Zircaloy-4

Modern Physics Letters B ◽

10.1142/s0217984915502000 ◽

2015 ◽

Vol 29 (32) ◽

pp. 1550200 ◽

Cited By ~ 6

Author(s):

Mohsin Rafique ◽

Naveed Afzal ◽

K. M. Deen ◽

Yong-Soo Kim

Keyword(s):

Hydrogen Concentration ◽

Electrochemical Behavior ◽

Electrochemical Impedance ◽

Charge Transfer Resistance ◽

X Ray Diffraction ◽

Transfer Resistance ◽

Corrosion Kinetics ◽

Before And After ◽

Potentiodynamic Anodic Polarization ◽

Kinetics Of

This work investigates the hydrogen precipitation effects on the electrochemical behavior of Zircaloy-4 in acidic saline media. The specimens of Zircaloy-4 were hydrogen charged at 200, 400 and 600 ppm concentrations for 30 min at 400[Formula: see text]C. X-ray diffraction (XRD) studies confirmed the formation of delta hydrides in the material. Scanning electron microscopy (SEM) results also indicated the presence of elongated hydrides whose density and thickness increased with the increase of hydrogen concentration in the alloy. The corrosion kinetics of the specimens were explored before and after hydrogen precipitation using potentiodynamic anodic polarization (PAP) and electrochemical impedance spectroscopy (EIS) techniques. The results showed that hydrogen precipitation shifts the corrosion potential towards more positive and thus improves the corrosion resistance of the alloy. The charge transfer resistance [Formula: see text] of the alloy was found to increase with increasing hydrogen concentration. This indicates an increased polarization tendency of the Zircaloy-4 surface with a limited dissolution tendency in the presence of delta hydrides.

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