Leaching of copper oxide with different acid solutions - ScienceDirect
· This study shows that leaching and dissolution of synthetic digenite or anilite, in acidic ferric sulfate solution, produce metastable polymorphs of geerite, yarrowite, spionkopite, covelline and CuS2; the structures contain the sulfur atoms in cubic close-packing.
leaching a pretreated ore in a mini-column at room temperature, yielded 49% copper dissolution. The data showed that repose time and temperature were the most important variables affecting copper extraction in the pretreatment stage.
· The dissolution behavior of copper and gold from their pure state and from Au/Cu alloys in cyanide solutions has been investigated using a rotating disc. Oxygen was used as an oxidant. The effect of the composition of the alloys, stirring speed of the disc, concentration of lixiviants and temperature on the overall dissolution kinetics has been studied.
dissolution of copper oxide ore. ratio of 10 mL/g is found to be optimal for leaching of copper using H2SO4. This can be explained in a way that the leaching agent is in excess of the calculated amount for the extraction of copper. After 75 min of dissolution, the
exception of chrysocola, leaching behavior of copper-bearing minerals under ferric-iron/sulfuric acid leaching is generally closely modelled by dissolution with sodium cyanide of assay-type samples. Primary sulfide minerals, such as
Copper Cobalt Africa, incorporating the 8th Southern African Base Metals Conference Livingstone, Zambia, 6–8 July 2015 Southern African Institute of Mining and Metallurgy 183 Leaching of Copper Sulphides Marc Nicolle,1 Marko Lampi,2 Kari Valkama, 2 and Janne Karonen ...
· The method for recovery of copper from leach solutions by precipitation with iron has been known for many years, being reported in use by Rio Tinto Mines in Spain as early as 1752. Scrap iron, detinned cans and sponge iron have been used depending on cost and availability.
· In contrast, the reduced dissolution rate of copper at very high mixing may be due to the change in process mechanism from diffusion to surface chemical reaction [42,43,44]. This behavior indicates that the leaching process of copper is affected by a particular
leaching of copper sulphides by ferric ions released during the dissolution of iron-containing gangue species such as clinochlore, and partial oxidation by dissolved oxygen. It is also possible that it originates from acid dissolution of chalcocite. Figure 4 shows the
In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. Fingerprint Dive into the research topics of ''Enhancement of copper dissolution by mechanochemical activation of copper ores: Correlation between leaching experiments and DEM simulations''.
· Abstract. In this study, recovery of copper from solid material (obtained by leaching of chalcopyrite with oxalic acid in the presence of hydrogen peroxide) with a copper oxalate structure was carried out selectively using HCl. The chemical composition of the solid was as 29.3%, 9.7%, and 13.3% for Cu, Fe, and S, respectively.
Results demonstrated that lead and copper leaching was predominant during the first 24 hr of stagnation, but reached an equilibrium state afterwards. Since the soluble fraction of both metals was small (12% for lead, 29% for copper), it is apparent that the non-soluble compounds play a predominant role in the dissolution process.
· When ores containing soluble copper minerals are leached using cyanide to recover the gold, copper also dissolves to form various copper (I) cyanide complexes: CuCN, Cu (CN) 2−, Cu (CN) 32− and Cu (CN) 43−.
Dissolution of copper from smelting slag by leaching in chloride media Dimitrijević M. a, Urošević D. b, Milić S. a, Sokić M. c, Marković R. b a University of Belgrade, Technical Faculty, Bor
Oxidative leaching resulted in complete dissolution of copper and tin after 60 or 90 minutes of thermally treated samples. Pyrolysis and combustion have positive effects on metals dissolution in comparison with samples without thermal pretreatment. Moreover
Bio-leaching of copper (0.3%) from a low grade Indian chalcopyrite ore of Malanjkhand copper mines, using a native mesophilic isolate predominantly Acidithiobacillus ferrooxidans (A.ferrooxidans), is reported. A bio-recovery of 72% Cu was recorded in the which ...
The copper bio-dissolution is facilitated by the presence of Fe(III) ions and higher redox potential generated during the course of leaching. 5. The activation energy acquired in the bio-leaching is found to be 96 and 108 kJ/mol for the un-adapted and the ore …
Increasing leaching pH up to 12 enhances gold dissolution in the copper–cyanide–glycine solutions. How- ever, increasing leaching pH to 13 has an adverse effect on the dissolution of gold.
Comparing the extent of the dissolution of copper-cobalt ores from the DRC Region In the Katanga province of the DRC, cobalt is commonly produced from heterogenite (CoO.2Co2O3.6H2O) as a by- product of copper production. Cobalt in heterogenite occurs in both
· The effects of sericite particle size, rotation speed, and leaching temperature on sericite dissolution and copper extraction in a chalcopyrite bioleaching system were examined. Finer particles, appropriate temperature and rotation speed for Acidithiobacillus ferrooxidans resulted in a higher Al3+ dissolution concentration. The Al3+ dissolution concentration reached its highest concentration ...
these solutions and stirred at 298~353 K. The leaching speed of copper was calculated from the obtained weight loss data. Moreover, influence concentrations of NH3 and NH4Cl were investigated for the dissolution of copper. The dissolution of copper was3
The leaching of lead and copper from plumbing materials is a source of metals in drinking water and is a public health concern. This work investigated the influence of free chlorine (HOCl/OCl-) on the level of copper in water in contact with the solid metal, and proposed an oxidation-dissolution mechanism to explain copper leaching.. Experimental results are presented for the leaching of ...
Leaching can be defined as "the dissolution of metals, solids, and chemicals into drinking water ... Health effects and mitigation techniques related to leaching of lead and copper from lead service lines or plumbing materials are addressed in the Lead ...
The copper leaching rate gradually diminished when its dissolution was around 20 and 25% in the combined and separate reactor, respectively, which may be attributed to a decrease in surface area of copper with leaching time and the formation of CuCl
· Leaching processes of metallic copper or ores containing copper in the divalent state have been the subject of many research works in recent years , , , , . However, no study was found concerning the dissolution kinetics of CuO/Al2O3catalyst in inorganic or …
· COPPER SULFIDES DURING LEACHING AND DISSOLUTION TABLE I. COTTPOSITION OF LEICIIED CRAINS OF DIGENI1E AS A FUIICTIOII OF CO}ICENTBATION OF FERRIC SULFATE LEICHATE AIID DURATION OF THE LEACHINC PNOCESS $11-U
copper precipitation/dissolution occur at the Aitik site, the assumed prevailing type of primary dissolution kinetics does not influence the modelled expected long-term copper leaching nearly as much as it does under homogeneous flow conditions without formation
· The authors found that a DMSO solution containing copper halide can dissolve precious metals more quickly than other leaching methods under mild conditions. Cu 2+ in DMSO acts as a strong oxidant that dissolves many metal elements [ 9 ].
· Although copper oxide and pure copper were first used to recover copper due to high solubility in ammonia, later on ammonia leaching of sulfide ores was also considered. The common method was the use of oxide roasting at high temperatures to convert sulfides to oxides in order to facilitate dissolution in ammonia solutions [ 1 ].
Bio-leaching of copper (0.3%) from a low grade Indian chalcopyrite ore of Malanjkhand copper mines, using a native mesophilic isolate predominantly Acidithiobacillus ferrooxidans (A.ferrooxidans), is reported. A bio-recovery of 72% Cu was recorded in the presence of this culture (not adapted), which increased to 75% with an ore adapted culture after 35 days at 35oC and pH 2.0 with <50fim ...