Crushed and agglomerated chalcopyrite ore was subjected to bacterially-assisted leaching at ambient temperature in columns that ranged in height from 1 ... be it dissolved or in concentrate, than either process used individually. There are two obvious advantages to processing chalcopyrite ore with such a combined leach/float approach. …
Chalcopyrite (CuFeS2) is one of the most abundant copper-bearing minerals, which accounts for approximately 70 percent of the world's known copper reserves. For more than 30 years, a significant number of processes have been developed to leach copper from chalcopyrite concentrates. These processes recover copper via hydrometallurgical …
The attachment of Acidithiobacillus ferrooxidans and Leptospirillum ferriphilum spp. grown on ferrous medium or adapted to a pyrite mineral concentrate to four mineral substrata, namely, chalcopyrite and pyrite concentrates, a low-grade chalcopyrite ore (0.5 wt%) and quartzite, was investigated. The quartzite represented a …
Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and …
A related process pioneered by BHP at ndida in the 1990s used a mix of NH 3 and (NH 4) 2 SO 4 to leach chalcocite concentrates at atmospheric pressure …
We report the investigation of a chalcopyrite leaching process that implements millimeter-sized glass beads that are stirred in the leach reactor to combine particle grinding, mechanical activation, and surface removal of reaction products. The paper focuses on demonstrating the impact of the so-called attrition-leaching phenomenon on the leaching …
A detailed review of chalcopyrite deposits, production and consumption, mining, ore processing, steps involved in the pyrometallurgical and hydrometallurgical processing of copper as well as...
In the hydrometallurgical processes, the ore or concentrate (chalcopyrite) is brought into close contact with a leach solution (frequently sulfuric acid) that dissolves the copper and leaves a residue of gangue …
Copper (Cu) ore is a naturally occurring mineral deposit that contains copper in varying concentrations. It is an important industrial metal that has been used by human civilizations for thousands of years due to its excellent electrical and thermal conductivity, high ductility, and resistance to corrosion. Copper is widely used in various applications, …
Roughing and closed-circuit experimental setups were applied to separate pyrite-rich CuS/MoS ore. Compared with ccp-mlb concentrate obtained by conventional process, concentrate obtained by instant PGA-Z200 flotation required significantly lower dosages of Na 2 S to reach the same separation efficiency. The closed-circuit setup was …
The commonest ore used in the extraction of copper is Chalcopyrite (CuFeS 2) also known as Copper Pyrites and other such sulphides. The percentage of copper in the actual ore is too low for direct extraction of copper to be viable. The concentration of ore is required and it is done by the Froth Flotation method. Concentration of Ore:
The lattice energy of chalcopyrite is close to 17,000 kJ mol −1, and the standard enthalpy of formation ΔH f and the standard Gibbs free energy of formation ΔG f ° values are −193.6 and −190.6 kJ mol −1, respectively.These ΔH f and ΔG f ° values are in the common range for sulfide minerals and do not explain the recalcitrance and unfavorable kinetics of …
Chalcopyrite is the dominant Cu ore mineral in most porphyry deposits, which make up an estimated 70% of the ... used a chalcopyrite concentrate with a chemical composition corresponding to a maximum purity of 81.8% chalcopyrite. The chalcopyrite ... suggesting that the leaching process begins with reaction (11) and …
Petrovic et al. (2018) reported a significant improvement in the chalcopyrite leaching process when H 2 O 2 is used as an oxidizing agent . The effectiveness of H 2 O 2 has been attributed to its ability to promote the formation of elemental sulfur and sulfate ions, which can help dissolve chalcopyrite.
In this research work, the pressure leaching of chalcopyrite concentrate with oxygen was studied. Experiments were carried out under conditions of the solid–liquid ratio of 0.1, agitation speed of 750 rpm, and sulfuric acid concentration of 2 M in a stainless-steel autoclave system under 0.6 to 1 MPa oxygen gas. Central composite design was …
The mixed concentrate was polymetallic sulfide ore dominated by galena and chalcopyrite, which was difficult to separate by conventional flotation method. In this study, a new process combining sulfuric acid pretreatment and flotation separation was carried out for the separation of the mixed concentrate.
Studying the process of chalcopyrite concentrates roasting, many researchers concluded that the chalcopyrite oxidation is not developed by its disintegration into simple copper and iron sulfides, but by the …
Ability for selective extraction of copper and zinc from zinc concentrate using association of chemolithotrophic bacteria was investigated. ... in pentlandite–chalcopyrite–pyrrhotite ore ...
1. Introduction. Chalcopyrite (CuFeS 2) is economically the most important Cu-sulfide mineral in the world, and unlike many other sulfide minerals, it is known to be recalcitrant in hydrometallurgical processing (Bobadilla-Fazzini et al., 2014, Zhang et al., 2014).In recent years, due to depleting high-grade copper resources, the processing of …
As a high-grade ore, the chalcopyrite concentrate has been successfully bioleached with the assistance of MFCs (Huang et al. 2019a). However, high-grade chalcopyrite ores in the world are becoming more and more scarce due to the consumption of copper resources and development of mine industry. ... Assessing a two …
chalcopyrite mineral concentrate (79.5 wt%, Andina mine, BHP Billiton) and crushed low-grade chalcopyrite-containing ore (ndida, BHP Billiton) were used. Major elemental composition of the concentrates used was deter-mined by X-ray fluorescence analysis. The chalcopyrite concentrate contained 29.8% copper, 25.9% iron and 31.7% sulphur.
ground and floated to concentrate the chalcopyrite and other sulfide fraction (containing 25-35 wt% Cu). These comminution and floating processes are costly and energy-intensive, and this energy intensity increases exponentially as ore grades deplete below 0.5% [3]. …
The formation of a passive layer during the hydrometallurgical leaching of copper from chalcopyrite leads to a relatively low copper recovery owing to the halting of the leaching efficiency. Thus, the copper recovery during chalcopyrite leaching needs to be promoted and the formation of passive layers on the mineral surface must be reduced. …
The hydrometallurgical process used to treat chalcopyrite include acid leaching, ammonia leaching, high-valent iron salt leaching, chloride leaching, hydrogen …
Gold in contact with pyrite and chalcopyrite Free gold hosted by pyrite. Also, gold mineral textures and associations with other minerals can be done by modal analysis. ... Recovery is the percentage …
To date, chalcopyrite is the commonest examined copper ore due to its inertness and global abundance indexes. Out of between 150 and 180 global copper ores, chalcopyrite is the most stabilized copper ore, due to its structural configuration [1, 2].It is mostly found in association with pyrite (FeS 2), bornite (Cu 5 FeS 4), sphalerite (ZnS), chalcocite (Cu 2 …
Processing low-grade chalcopyrite ore (<0.3% Cu) is the main challenge of copper complexes.. Controlling jarosite makes the process attractive from technical and economical viewpoints.. Two main strategies were studied: ORP control and chloride addition in irrigation. A hybrid lixiviant (Sulfate-chloride) resulted in more than 80% …
The changes in the elemental contents and the structural properties of chalcopyrite concentrate when roasted were studied, and the main reactions contributing to the leaching process revisited. Firstly, TG/DTA measurements were performed to identify the roasting temperatures that influenced the type of species reacting with …
The optimum conditions for the extraction of copper from chalcopyrite concentrate into SO2-saturated water were evaluated using the Taguchi optimization method. High level copper recovery was obtained in an environmentally friendly process that avoids sulfur dioxide emission into the atmosphere because SO2 forming in the …
To enhance the leaching of chalcopyrite concentrates, this study evaluated a new process for extracting copper using iodized solutions and sulfuric acid diluted in seawater without pressure or ...