scholarly journals Effect of iron powder on copper extraction by acid leaching of chalcopyrite concentrate.

1996 ◽  
Vol 29 (4) ◽  
pp. 720-722 ◽  
Author(s):  
Ezequiel Cruz Sanchez ◽  
Yoshiaki Umetsu ◽  
Fumio Saito
Keyword(s):  
Iron Powder ◽  
Acid Leaching ◽  
Copper Extraction ◽  
Chalcopyrite Concentrate

Investigating and Optimization of Copper Extraction from Chalcopyrite Concentrate with Hydrogen Peroxide in Presence of Acetic Acid

2017 ◽  
Vol 7 (4) ◽  
Author(s):  
Mehmat Deniz Turan ◽  
Musa Sarikaya ◽  
Z. Abidin Sari ◽  
Ahmet Haxhiaj ◽  
Tolga Depci ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Copper Extraction ◽  
Chalcopyrite Concentrate

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 Dissolution of Black Copper Oxides from a Leaching Residue

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1012
Author(s):  
Víctor Quezada ◽  
Oscar Benavente ◽  
Cristopher Beltrán ◽  
Danny Díaz ◽  
Evelyn Melo ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Acid Leaching ◽  
Atomic Emission ◽  
Copper Oxides ◽  
Leach Residue ◽  
Copper Extraction ◽  
Original Sample ◽  
Hydrogen Electrode ◽  
Inductively Coupled ◽  
Leaching Residue

This article presents the behavior of black copper minerals in reducing acid leaching using FeSO4 as reducing agent. The original sample, which was a blend of green and black copper minerals, was treated first by an oxidizing acid leach using O3 to dissolve the soluble phase (green copper oxides). The residue (mainly black copper) was evaluated by agitated leaching under three different solution potentials, with respect to the standard hydrogen electrode (SHE) (450, 500, and 600 mV (SHE)) at 25 °C. The original sample and the leach residue were characterized by scanning electron microscope (SEM) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The O3 leach residue was 1.43% copper, with 50% of the insoluble phase associated with copper pitch, copper limonites, and unreacted chrysocolla. The results of leaching using FeSO4 demonstrate that it is possible to obtain 90% copper extraction using a solution with a potential of 450 mV, while leaching at 600 mV resulted in 65% copper extraction. Acid consumption was 40 kg/t in the test at 450 mV, followed by 30 kg/t in the 500 mV test, and finally 25 kg/t in the 600 mV test, showing that reactivity decreases with increased solution potential. The results show that retreatment of a leaching residue is possible, considering the presence of copper pitch, copper limonites, and chrysocolla as the main copper contributing minerals. Modeling of copper extraction with nonlinear regression is proposed. The retreatment of residues resulting from conventional acid leaching can be an alternative to make use of the treatment capacity of hydrometallurgical plants.

Substrate Utilisation and Chalcopyrite Concentrate Bioleaching at 60°C in the Presence of Nitrate

2013 ◽  
Vol 825 ◽  
pp. 435-438
Author(s):  
Denis W. Shiers ◽  
David E. Ralph ◽  
Helen R. Watling
Keyword(s):  
Cell Lines ◽  
Copper Extraction ◽  
Batch Cultures ◽  
Cell Numbers ◽  
Substrate Utilisation ◽  
Chalcopyrite Concentrate ◽  
Tetrathionate Oxidation

In batch cultures, the presence of nitrate inhibited iron (II) oxidation by iron (II)- or tetrathionate-adapted Acidianus (A.) brierleyi and Sulfolobus (S.) metallicus cells and tetrathionate oxidation by iron (II)-adapted A. brierleyi cells. Tetrathionate-adapted cell lines of A. brierleyi and S. metallicus oxidised tetrathionate in the presence of up to 40 mM nitrate but cell numbers were lower than those in uncontaminated tests. The results of the bioleaching tests indicated a possible window of enhanced copper extraction in the presence of 2030 mM nitrate that might be exploited in tank bioleaching. The build up of nitrate above 40 mM in bioleaching solutions must be avoided

Dilute sulphuric-acid leaching of garnierite ore after magnetic-roasting the ore mixed with iron powder

1987 ◽  
Vol 19 (1-4) ◽  
pp. 285-296 ◽  
Author(s):  
Masayasu Kawahara ◽  
Toshiharu Mitsuo ◽  
Yoshinori Shirane ◽  
Yutaka Mitsune
Keyword(s):  
Iron Powder ◽  
Sulphuric Acid ◽  
Acid Leaching

Effect of Sulfuric Acid Concentration on Chalcopyrite Concentrate Chemical Leaching

2009 ◽  
Vol 71-73 ◽  
pp. 353-356
Author(s):  
Seong Jin Joe ◽  
Tadashi Chida ◽  
Masatoshi Sakoda ◽  
Hidekatsu Nakamura ◽  
Muneyuki Tamura ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Concentration ◽  
Sulfuric Acid Concentration ◽  
Copper Extraction ◽  
H2so4 Solution ◽  
Chemical Leaching ◽  
X Ray ◽  
Electron Probe Microanalyzer ◽  
Chalcopyrite Concentrate ◽  
Leaching Reaction

This study reports the effect of sulfuric acid concentration on chalcopyrite chemical leaching in very simple H2SO4 solution systems ranging from 23g/L to 30g/L, with 2.5% chalcopyrite concentrate at 30°C. Copper extraction from chalcopyrite increases with an increase in sulfuric acid concentration, e.g. 86%, 90% and 92% after 96 days at 23g/L, 25/L and 27g/L H2SO4 solution respectively. Sulfur element formed on the surface of chalcopyrite was very porous as the result of an electron probe microanalyzer (EPMA). Copper extraction, however, leveled out at 35% after 20 days when the sulfuric acid concentration was higher than 28g/L on 25g/L of chalcopyrite concentrate. Sulfur element was detected by X-ray analysis as only a leaching reaction product. The passivation may be caused by thick elemental surface formed on the surface of chalcopyrite.

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.

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