The leaching of natural chalcopyrite was studied in both ferric sulfate and ferric chloride solutions. The chemistry of the two reactions is quite different, with substantial sulfur oxidation ...

The Bureau of Mines presents an economic evaluation of its process for the ferric chloride leaching of chalcopyrite concentrate. In this process, chalcopyrite concentrate is leached with ferric chloride solution to extract copper, which is precipitated from the solution by electrolysis while leaving sulfur in the residue. Spend liquor from electrolysis is treated with oxygen to regenerate the fe

Copper Leaching From Chalcopyrite Concentrate in Cu (II)-Fe. A high calcium chloride concentration (110–165 g/L) was used to main-Chloride leaching Chalcopyrite tain a high cuprous solubility and enhance copper leaching. With 3–4 h of leaching time for each stage, the copper extraction reached 99% or higher while that of iron was around 90%.

The invention claimed is: 1. A hydrometallurgical method of recovering copper from a material, in a heap, that contains a copper sulphide mineral which contains at least chalcopyrite comprising leaching the material in an acidic chloride solution or a mixed chloride/sulphate solution in the presence of dissolved oxygen and maintaining the mineral's surface potential within a range of 550 mV ...

Previous U.S. Bureau of Mines (USBM) research on the leaching of chalcopyrite with ferric sulfate [Fe2(SO4)3] demonstrates that surfactant additions enhance chalcopyrite (CuFeS2) leaching and that surfactant selection has a significant impact on the initial leaching rate. Additions of chloride ion (Cl-) are also known to enhance chalcopyrite leaching, although a review of the …

For the final reaction 16 mol of ferric chloride are necessary for an entire oxidation of one mol of chalcopyrite, this means that for 1 gr of chalcopyrite 14.14 g of FeCl 3 are required, nevertheless due to the final products of the leaching process in the present and other previous studies (Majima, Awakura et al. 1985, Havlík, Škrobian et ...

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 leaching of the copper component of chalcopyrite ...

A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was done to elucidate the leaching mechanism of chalcopyrite with FeCl 3 . The leaching rate of chalcopyrite exhibits a half order dependency on the FeCl 3 concentration, whereas it is independent of the FeCl 2 concentration. The mixed potential of chalcopyrite exhibits a 72 mV · decade^-1

In order to leach chalcopyrite and chalcocite under atmospheric or high pressure leaching conditions in sulfate or chloride medium, ferric and copper ions, bacteria, oxygen and other oxidizers can ...

Copper leaching from chalcopyrite concentrate in ferric and cupric chloride system was investigated using a two-stage countercurrent leach circuit under a nitrogen atmosphere at 97 degrees C to ...

Using ferric chloride as an oxidant, here, we investigated the leaching effect of low-nickel matte in a flow field produced by mechanical agitation. The factors affecting a leaching reaction, such as stirring speed, leaching time, low-nickel matte particle size, and inert abrasive quartz sand, were studied. X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), a laser particle size ...

chalcopyrite leaching in chloride acid solutions is not fully understood and it triggers difficult to predict the value of E op under given conditions. The aim of the present study is to establish the mechanism of chalcopyrite leaching in acidic ferric chloride solutions and …

D.L. Jones and E. Peters, "The Leaching of Chalcopyrite with Ferric Sulphate and Ferric Chloride," in Extractive Metallurgy of Copper, Vol. II, edited by J.C. Yannopoulos and J.C. Agarwal, TMS-AIME, 1976, p. 633–653. Google Scholar Download references

A tank leaching method to recover copper from a slurry of a copper sulphide mineral concentrate and an acidic or mixed chloride/sulphate solution. Leaching takes place in the presence of dissolved oxygen and the surface potential of the mineral is maintained below 600 mV (vs. SHE).

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride or mixed chloride/sulphate solution in the presence of oxygen with the surface potential of the mineral below 600 mV (vs. SHE) to cause dissolution of the copper sulphide.

A method to recover copper and elemental sulfur from chalcopyrite concentrate, using a ferric chloride leach, CuFeS//2 plus 3FeCl//3 yields CuCl plus 4FeCl//2 plus 2S, was reported by the Federal ...

In this research, the effect of mechanical activation, via ball milling, of copper sulfide concentrate on the efficiency and mechanism of copper leaching in an acidic ferric chloride solution was investigated. Copper concentrate, containing chalcopyrite as the main constituent, was supplied from Sarcheshme mine, located in the central part of Iran. By 24 hours of ball milling, the size of the ...

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride/sulphate solution in the presence of oxygen with the surface potential of the mineral below 600 mV (vs. SHE) to cause dissolution of the copper sulphide.

POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the

Abstract The redox potential dependence of chalcopyrite leaching was investigated in acidic ferric chloride solutions using a specially designed batch leaching experimental setup that accurately determined and monitored changes of solution redox potential with time. The concentration ratio of ferric (Fe3+) to ferrous (Fe2+) ions and leaching rate-redox potential relationship were then ...

Title: Chloride leaching for chalcopyrite: Creator: Liddicoat, Jenni Anne: Publisher: University of British Columbia: Date Issued: 2003: Description: Two new process flowsheets have been developed which combine chloride leaching for chalcopyrite with solvent extraction, to selectively transfer copper to a conventional sulfate electrowinning circuit.

But a direct ferric chloride leaching process for complex sulfide ores has yet to be developed. The proposed chloride leaching process for the treatment of Delta complex sulfide ores is shown in Figure 1. In the proposed flowsheet, the ores are mated by single and two stage ferric chloride leaching to dissolve zinc, lead, copper and ! ! silver.

copper extraction from chalcopyrite of approximately 89% were achieved. Keywords: Chalcopyrite, acid leaching, ferric ion, Taguchi experimental design, Minitab 16.0. Introduction Chalcopyrite, (CuFeS2), is the most important copper mineral in nature.1,2 It is generally separated from associated gangue minerals by

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride or mixed chloride/sulphate solution in the presence of oxygen with the surface potential of the mineral below 600 mV (vs. SHE) to cause dissolution of the copper sulphide.

Abstract: Chalcopyrite leaching in acidic chloride solution with-out sulphates. The effect of dissolved oxygen and ferrous/ferric/cu-pric ions in solution on the leaching behavior of chalcopyrite and the phenomenology of the passivating layer formation on the chalcopyrite surface in an aqueous acidic chlorinated medium with dissolved oxy-

In general, the leaching of chalcopyrite is more effective in chloride solutions with cupric ions as the oxidant than in sulfate solutions with ferric ions as the oxidant. This is possibly due to kinetic rather than thermodynamic considerations e.g. the higher rates of electron transfer in chloride

Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of agglomerated ore; the ...

Ferric chloride is a more effective reagent and this is attributable to the morphological characteristics of chalcopyrite leaching. The kinetics with both leachant solutions were found to be linear over an extended period, followed by an acceleration stage, as a …

1. Ferric chloride leaching of chalcopyrite sulphidized to give covellite and pyrite; effect of temperature on reaction stoichiometry. Line a: theoretical results assuming only covellite leached according to reaction (1). Solids addition (108 g to 500 ml 2.0 M FeCI,, 0.6 M HC1) is maximum for complete copper recovery assuming only reaction (1 ...

The leach solution contains approximately 36 percent ferric chloride and about 1 percent hydrochloric acid. During leaching about 99 percent of the copper, 84 percent of the iron, 90 percent of the calcium, and 96 percent of the silver are dissolved. The representative reaction for dissolving chalcopyrite is. CuFeS2 + 3FeCl3 → CuCl + 4FeCl2 + 2S.

the oxidant concentration increased up to 50 g/L in cupric chloride leaching, and copper extraction was lower (15 – 30 %-units) than in ferric chloride leaching (Figure 2). Figure 2: Extraction of copper in ferric and cupric chloride leaching with various concentrations of oxidants (pH = 1 – 1.8, T = 95 °C, concentration of NaCl = 250 g/L).

Leaching of chalcopyrite with ferric ion. Part II: Effect of redox potential. By Antonio Ballester. THE KINETICS OF THE DISSOLUTION OF CHALCOPYRITE IN CHLORIDE MEDIA Lilian De Lourdes Velásquez Yévenes Metallurgical Engineer. By Gustavo Quezada. A Review on Novel Techniques for Chalcopyrite Ore Processing.

Sullivan concluded that ferric chloride is a better chalcopyrite leaching agent than ferric sulphate and that the effect was more marked at high temperatures. Dutrizac et al. (1969) found that, in a temperature range between 50 and 100 °C, the chalcopyrite leaching rate was linear in chloride medium and parabolic in sulphate medium.

A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was done to elucidate the leaching mechanism of chalcopyrite with FeCl 3.The leaching rate of chalcopyrite exhibits a half order dependency on the FeCl 3 concentration, whereas it is independent of the FeCl 2 concentration. The mixed potential of chalcopyrite exhibits a 72 mV · decade −1 dependency upon ...