Process Enhancement of Bioleaching of Covellite Concentrate through Modification of Solution Potential

2007 ◽  
Vol 20-21 ◽  
pp. 152-155
Author(s):  
E. Zhou ◽  
Jian Kang Wen ◽  
Ren Man Ruan ◽  
Dian Zuo Wang
Keyword(s):  
Environmental Change ◽  
Redox Potential ◽  
Dissolution Rate ◽  
Copper Recovery ◽  
Operating Parameters ◽  
Electrochemical Studies ◽  
Ferric Ions ◽  
Fujian Province ◽  
Copper Mine ◽  
Leaching Process

Based on the bioleaching mechanism and electrochemical studies of covellite, the dissolution rate of covellite mineral is accelerated through increasing the redox potential (Eh) of the leach. In the present work, some methods were adopted to enhance the bioleaching of covellite concentrate (collected from Zijinshan copper mine, Fujian province, China) by adding different oxidants such as pure pyrite, ferric ions and H2O2. The goal of this study was to provide appropriate operating parameters for the industry application and increase the efficiency of the bioleaching of copper mine. The results showed that the optimal way to increase the redox potential (Eh) level was the addition of pure pyrite. This method could effectively raise the Eh of bioleaching process while the effect of environmental change was negligible. It could quicken the leaching process and enhance the final copper recovery through the addition of pyrite by 1:1 or 1:2 ratio of covellite concentrate to pyrite.

Control of the Redox Potential by Oxygen Limitation Inhibits Bioleaching of Pyrite

2009 ◽  
Vol 71-73 ◽  
pp. 401-404 ◽  
Author(s):  
Biao Wu ◽  
Jian Kang Wen ◽  
Gui Ying Zhou ◽  
Ren Man Ruan
Keyword(s):  
Redox Potential ◽  
Dissolution Rate ◽  
Oxygen Limitation ◽  
Metal Sulfides ◽  
Electrochemical Studies ◽  
Redox Potentials ◽  
Nitrogen Gas ◽  
Copper Sulfides ◽  
Fe Content ◽  
Constant Potential

Based on the bioleaching mechanism and electrochemical studies of metal sulfides, the dissolution rate of secondary copper sulfides and pyrite are controlled by redox potentials. Experiment on the bioleaching of the secondary copper sulfides under constant potential by sparging with nitrogen gas demonstrated, by analyzing Cu and Fe content of the bioleaching solution and residues, the pyrite and secondary cooper sulfides dissolution rates have large difference in various redox potential. The pyrite and secondary cooper sulfides have good selection when the redox potential controlled between 700mV and 760mV, we can realize the secondary copper sulfides bioleaching process be controlled, then supply theoretical guide for the iron-acid balance during copper bioleaching process.

The Influence of Pyrite on Galvanic Assisted Bioleaching of Low Grade Chalcopyrite Ores

2017 ◽  
Vol 262 ◽  
pp. 93-98
Author(s):  
Biao Wu ◽  
He Shang ◽  
Min Lin Wu ◽  
Jian Kang Wen
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Redox Potential ◽  
Recovery Rate ◽  
Phylogenetic Analyses ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Rrna Gene ◽  
Low Grade ◽  
Copper Mine

The experiment focused on the effect of pyrite on the dissolution of the ore from Saindak copper mine in Pakistan. The MLA results showed that the ore mainly consisted of chalcopyrite, which was associated closely with pyrite. The bioleaching process and galvanic promotion experiments of pyrite on the copper extraction were investigated. The data revealed that copper recovery rate could be up to 97.8% after the bioleaching process by extreme thermophilic acidophilic organisms for 30 days at 65 OC. The temperature and redox potential were the controlled factors to recover copper from the Saindak mineral. The phylogenetic analyses of 16S rRNA gene fragments revealed that organisms related to Metallosphaera cuprina strain Ar-4 and Sulfolobus sp. HB59 were most dominant. Pyrite could accelerate the dissolution of chalcopyrite as one galvanic assistant substance, which would be strengthened by elevating the temperature or in the presence of microorganisms.

Enhancement of copper recovery by acid leaching of high-mud copper oxides: A case study at Yangla Copper Mine, China

2018 ◽  
Vol 202 ◽  
pp. 321-331 ◽  
Author(s):  
Shenghua Yin ◽  
Leiming Wang ◽  
Aixiang Wu ◽  
Michael L. Free ◽  
Eugie Kabwe
Keyword(s):  
Acid Leaching ◽  
Copper Oxides ◽  
Copper Recovery ◽  
Copper Mine

Enhancing Cu-Zn-Cr-Ni Co-Extraction from Electroplating Sludge in Acid Leaching Process by Optimizing Fe3+ Addition and Redox Potential

2019 ◽  
Vol 36 (9) ◽  
pp. 1244-1257 ◽  
Author(s):  
Ping Wu ◽  
Lijuan Zhang ◽  
Yongdi Liu ◽  
Xinxin Xie ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Redox Potential ◽  
Acid Leaching ◽  
Leaching Process ◽  
Electroplating Sludge

scholarly journals Contributions of Microbial “Contact Leaching” to Pyrite Oxidation under Different Controlled Redox Potentials

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 856
Author(s):  
Bingxu Dong ◽  
Yan Jia ◽  
Qiaoyi Tan ◽  
Heyun Sun ◽  
Renman Ruan
Keyword(s):  
Redox Potential ◽  
Dissolution Rate ◽  
Elemental Sulfur ◽  
Microbial Consortium ◽  
Pyrite Oxidation ◽  
Microbial Consortia ◽  
Redox Potentials ◽  
Sulfur Passivation ◽  
Sulfur Oxidizing ◽  
Contact Oxidation

The function of microbial contact leaching to pyrite oxidation was investigated by analyzing the differences of residue morphologies, leaching rates, surface products, and microbial consortia under different conditions in this study. This was achieved by novel equipment that can control the redox potential of the solution and isolate pyrite from microbial contact oxidation. The morphology of residues showed that the corrosions were a little bit severer in the presence of attached microbes under 750 mV and 850 mV (vs. SHE). At 650 mV, the oxidation of pyrite was undetectable even in the presence of attached microbes. The pyrite dissolution rate was higher with attached microbes than that without attached microbes at 750 mV and 850 mV. The elemental sulfur on the surface of pyrite residues with sessile microorganisms was much less than that without attached microbes at 750 mV and 850 mV, showing that sessile acidophiles may accelerate pyrite leaching by reducing the elemental sulfur inhibition. Many more sulfur-oxidizers were found in the sessile microbial consortium which also supported the idea. The results suggest that the microbial “contact leaching” to pyrite oxidation is limited and relies on the elimination of elemental sulfur passivation by attached sulfur-oxidizing microbes rather than the contact oxidation by EPS-Fe.

A Study of the Optimal Model of the Flotation Kinetics of Copper Slag from Copper Mine BOR

2014 ◽  
Vol 59 (3) ◽  
pp. 821-834 ◽  
Author(s):  
Rodoljub D. Stanojlović ◽  
Jovica M. Sokolović
Keyword(s):  
Pure Copper ◽  
Copper Slag ◽  
Copper Recovery ◽  
Optimal Model ◽  
Flotation Kinetics ◽  
Kinetics Parameters ◽  
Flotation Tailings ◽  
Copper Mine ◽  
Flotation Cell ◽  
Kinetics Of

Abstract In this study the effect of mixtures of copper slag and flotation tailings from copper mine Bor, Serbia on the flotation results of copper recovery and flotation kinetics parameters in a batch flotation cell has been investigated. By simultaneous adding old flotation tailings in the ball mill at the rate of 9%, it is possible to increase copper recovery for about 20%. These results are compared with obtained copper recovery of pure copper slag. The results of batch flotation test were fitted by MatLab software for modeling the first-order flotation kinetics in order to determine kinetics parameters and define an optimal model of the flotation kinetics. Six kinetic models are tested on the batch flotation copper recovery against flotation time. All models showed good correlation, however the modified Kelsall model provided the best fit.

scholarly journals Investigation of the optimal technology for copper leaching from old flotation tailings of the copper mine bor (Serbia)

10.30544/514 ◽  
2020 ◽  
Vol 26 (2) ◽  
pp. 209-222 ◽  
Author(s):  
Vesna Conić ◽  
Srđan Stanković ◽  
Branislav Marković ◽  
Dragana Božić ◽  
Jovica Stojanović ◽  
...  
Keyword(s):  
Iron Concentration ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Efficient Technology ◽  
Flotation Tailings ◽  
Copper Mine ◽  
Moderately Thermophilic ◽  
Acidophilic Bacteria ◽  
Leaching Experiment ◽  
Optimal Technology

This work aimed to investigate optimal leaching technology for copper extraction from old flotation tailings of the Copper Mine Bor. The leaching degree of copper after leaching with sulphuric acid at 80 °C was 50%, the maximal leaching degree was achieved after 30 minutes. Then, old flotation tailings were leached with adapted moderately thermophilic acidophilic bacteria in a bioreactor at 40 °C. Maximal leaching degree of 84% was achieved after nine days of the experiment. The third leaching experiment was conducted with biogenic lixiviant obtained by bacterial oxidation of the ferrous iron (concentration of Fe3+ 1300 mgL-1, pH 2.14). Biogenic lixiviant with ferric sulphate was then used in the leaching experiment at 80 °C. Maximal leaching degree was 78%, and it was achieved after five minutes. Results of the leaching experiments show that the most efficient technology for copper recovery from the old flotation tailings of the Copper Mine Bor was leaching with biogenic lixiviant.

Modelling the process of kaolinite leaching from a copper mine flotation waste

Clay Minerals ◽  
2010 ◽  
Vol 45 (1) ◽  
pp. 107-114 ◽  
Author(s):  
I. Djurić ◽  
I. Mihajlović ◽  
D. Bogdanović ◽  
Ž. Živković
Keyword(s):  
Activation Energies ◽  
Effective Management ◽  
Fractional Conversion ◽  
Kinetic Function ◽  
Copper Mine ◽  
Leaching Process ◽  
Kinetic Investigations

AbstractThis paper presents the results of acidic leaching of kaolinite from the flotation waste of the RTB Bor copper mine, Serbia. The kaolinitic concentrate from the flotation waste contains 32% Al2O3. Kinetic investigations were conducted on the leaching of kaolinite roasted at 750°C for 60 min under air using H2SO4, HNO3 and HCl. Activation energies for the process were 74, 63 and 63.2 kJ mol–1 for sulphuric, nitric and hydrochloric acids, respectively. The kinetic function D3: [1 – (1 – α)1/3]2 = kt was chosen to describe the fractional conversion dependence on time and temperature. This enabled effective management of the leaching process to be carried out.

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