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.

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 Bioleaching of copper from old flotation tailings samples (Copper Mine Bor, Serbia)

2015 ◽  
Vol 80 (3) ◽  
pp. 391-405 ◽  
Author(s):  
Srdjan Stankovic ◽  
Ivana Moric ◽  
Aleksandar Pavic ◽  
Sandra Vojnovic ◽  
Branka Vasiljevic ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Acid Leaching ◽  
Free Water ◽  
Copper Extraction ◽  
Acidic Water ◽  
Acidic Lake ◽  
Flotation Tailings ◽  
Copper Mine

Bioleaching of samples taken from depths of 10, 15, and 20 meters from old flotation tailings of the Copper Mine Bor was conducted in shaken flasks using extremely acidic water of Lake Robuleas lixiviant. Yield of copper after five weeks of the bioleaching experiment was 68.34?1.21% for 15 m sample, 72.57?0.57% for 20 m sample and 97.78?5.50% for 10 m sample. The obtained results were compared to the results of acid leaching of the same samples and it was concluded that bioleaching was generally more efficient for the treatment of samples taken from depths of 10 m and 20 m. The content of pyrite in the 20 m sample, which contained the highest amount of this mineral, was reduced after bioleaching. Benefits of this approach are: recovery of substantial amounts of copper, reducing the environmental impact of flotation tailings and the application of abundant and free water from the Robule acidic lake as lixiviant. Results of the experiment showed that bioleaching can be more efficient than acid leaching for copper extraction from flotation tailings with higher sulfide contents.

scholarly journals Cobalt and copper recovery from the ancient flotation tailings by selective sulfation roast - leaching process

2019 ◽  
Vol 55 (3) ◽  
pp. 315-324
Author(s):  
M. Ozer
Keyword(s):  
Iron Concentration ◽  
Copper Recovery ◽  
Atmospheric Conditions ◽  
Iron Extraction ◽  
Flotation Tailings ◽  
Valuable Metals ◽  
Sulfation Roasting ◽  
Long Time ◽  
Direct Leaching

The ancient flotation tailings from Lefke, Cyprus, have a potential for non-ferrous metals such as cobalt and copper from more than 9.5 million tons of reserves containing 0.38% Cu, 0.032% Co, and 22.6% Fe. Recovery of cobalt and copper from these tailings can provide great benefits from economic and environmental perspectives. While the ancient tailings were kept long time in storage in dumps, the characteristics of the material has become different from the common Co and Cu bearing ores. In order to extract these valuable metals, a process involving combination of roasting and leaching was applied in this study. Since this process responded to recovery to some extent, an innovative technique of using Na2SO4 as a promoter during roasting was proposed. Utilizing of Na2SO4 did not provide only higher metal extractions, but also resulted in high selectivity. In the scope of the study, following the determination of the mineralogy and chemical composition of the tailings, certain processes such as direct leaching and sulfation roasting with/without additives before leaching were applied. Since low metal extractions were obtained from direct leaching, a selective sulfation process was applied on the tailings before leaching in order to produce a pregnant solution containing higher amounts of Co and Cu metals by reducing the iron concentration. When sulfation roasting was performed without any additive, the desired selectivity could not be provided, since the sample was considerably oxidized under the atmospheric conditions in the past. Therefore, the usage of Na2SO4 as an additive with the amount of 25% at a roasting temperature of 700?C was tested. Consequently, Na2SO4 improved the sulfation and resulted in higher cobalt (90.1%) and copper (71.2%) recovery during leaching. Beside this, an improvement with a selective sulfation was obtained by combined effect of Na2SO4 addition and temperature, and the iron extraction decreased from 26.1% to 3.9%.

Effect of Particle Size on the Column Bioleaching of Tibet Yulong Copper Ore

2015 ◽  
Vol 1130 ◽  
pp. 375-378 ◽  
Author(s):  
Li Kai ◽  
Yu Guang Wang ◽  
Li Juan Zhang ◽  
Chen Zhu ◽  
Mao Feng ◽  
...  
Keyword(s):  
Particle Size ◽  
Acid Leaching ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Particle Sizes ◽  
Control Test ◽  
Copper Ore ◽  
Thermophilic Microorganisms ◽  
Column Reactor ◽  
Moderately Thermophilic

This study aimed to investigate the effect of ore particle size on the bioleaching of Yulong copper ore in the bench-scale columns using the mixed culture of moderately thermophilic microorganisms. Bioleaching experiments were carried out on particle sizes of 5-10, 10-15 and 15-25mm in the same kind of column reactors. In the control test of acid leaching, the column reactor was charged with the middle particle size (10-15mm). The results indicated that copper extraction in the column reactor with particle size of 5-10 mm was highest among the three particle sizes. After 110-days leaching, 89% of copper was leached at 5-10 mm particle size while 57% was extracted at 15-25 mm particle size and 80% at 10-15 mm. Under the same particle size (10-15 mm), copper recovery in the column reactor with inoculation of microorganisms was 25% higher in comparison to the control test of acid leaching, while sulfuric acid consumption was 33% less than that.

Investigation of the Effect of pH Operating Conditions on Bioleaching of Low-Grade Chalcopyrite in Column Reactors

2013 ◽  
Vol 825 ◽  
pp. 401-405
Author(s):  
Odilon M. Tshilombo ◽  
Tunde V. Ojumu
Keyword(s):  
Redox Potential ◽  
Iron Concentration ◽  
Leach Solution ◽  
Operating Conditions ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Low Grade ◽  
Effect Of Ph ◽  
Dissolved Ions ◽  
High Concentrations

Bioleaching of low-grade sulphide minerals is now an established process, with much interest in chalcopyrite. However few studies have been carried out on ores containing silicates gangue materials. Chalcopyrite has been reported to be refractory at ambient temperature. Several factors that influence bioleaching kinetics are well documented such as particle size, pH, temperature, galvanic interaction and microbial activity. The purpose of this research was to investigated the effect of pH as well as pre-leaching on bioleaching of silicate rich and low-grade chalcopyrite using mixed thermophilic cultures, with a view to maximize copper solubilization rate in a column reactor operated at 70°C. The column was packed with low-grade chalcopyrite of the size range -20+15 mm. Leaching was monitored at specific time intervals (3 days) by measuring the pH, the redox potential, the copper and iron concentration in the solution. The results of the investigation have shown that copper extracted was highest at pH 1.3 and at moderately low redox potential (410 – 430 mV) using Ag/AgCl electrode, and that pre-leaching contributed insignificantly to the leaching rate. At pH 2.5, the copper extraction was low due to the jarosite. Furthermore, the analysis XRD of leached residues has indicated that the main passivating products were gypsum, jarosite, hexahydrite, and silica. However, although low pH resulted to high copper recovery, the results also showed that the pregnant leach solution (PLS) contained high concentrations of dissolved ions which might have inhibited the microbial activities.

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

Copper recovery improvement in an industrial flotation circuit: A case study of Sarcheshmeh copper mine

2018 ◽  
Vol 41 (6) ◽  
pp. 761-778 ◽  
Author(s):  
Mehrshad Asghari ◽  
Fardis Nakhaei ◽  
Omid VandGhorbany
Keyword(s):  
Copper Recovery ◽  
Copper Mine ◽  
Sarcheshmeh Copper Mine

Investigation of the possibility of copper recovery from the flotation tailings by acid leaching

2008 ◽  
Vol 158 (1) ◽  
pp. 23-34 ◽  
Author(s):  
M.M. Antonijević ◽  
M.D. Dimitrijević ◽  
Z.O. Stevanović ◽  
S.M. Serbula ◽  
G.D. Bogdanovic
Keyword(s):  
Acid Leaching ◽  
Copper Recovery ◽  
Flotation Tailings
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