3 edition of Improvements in Ferric Chloride Leaching of Chalcopyrite Concentrate. found in the catalog.
Improvements in Ferric Chloride Leaching of Chalcopyrite Concentrate.
United States. Bureau of Mines.
|Series||Report of investigations (United States. Bureau of Mines) -- 8007|
|Contributions||Haver, F., Baker, R., Wong, M.|
In the constant-potential leaching cells, addition of Cl- to ferric sulfate for leaching of chalcopyrite at 50 °C, pH , and 1 to 5 g/L total Fe improved the leaching rate at , , and mV Eh. In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different concentrations of Cu2+ (, , and g L−1), four different concentrations of Cl− (0, 5, 7, and 10 g L−1), two different pH values of 1 and 2, and a constant temperature of 60 °C. Results Cited by: 2.
The literature on the ferric ion leaching of chalcopyrite has been surveyed to identify those leaching parameters which are well established and to outline areas requiring additional study. New experimental work was undertaken to resolve points still in dispute. It seems well established that chalcopyrite dissolution in either ferric chloride or ferric sulfate media is independent of stirring Cited by: Abstract A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was done to elucidate the leaching mechanism of chalcopyrite with FeCl 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 .
Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and tellurium by: 9. The effects of chloride ions on chalcopyrite leaching by biologically‐produced ferric sulfate solution and on the iron‐oxidizing culture were determined. Chloride ions significantly increased chalcopyrite leaching by ferric sulfate at 67 °C and 87 °C, but slowed down the leaching at 50 °C. At 90 °C, chloride at 5 g dm−3 ( g Cl− g−1 concentrate) increased the copper yield from.
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Improvements in ferric chloride leaching of chalcopyrite concentrate / by F.P. Haver, R.D. Baker, and M.M. Wong. Additional Physical Format: Online version: Haver, Frank P.
Improvements in ferric chloride leaching of chalcopyrite concentrate (OCoLC) This work presents a study of the leaching of chalcopyrite in acidic ferric chloride.
Two chalcopyrite samples (natural chalcopyrite crystal and chalcopyrite concentrate) were leached under different conditions. The effects of stirring speed and temperature were investigated. It was found that agitation had a negative effect on copper recovery Cited by: In this study the kinetic leaching Improvements in Ferric Chloride Leaching of Chalcopyrite Concentrate.
book of chalcopyrite concentrate from Cuba (% Cu) were investigated with granularities − + μm as delivered. The value of the apparent activation energy was determined to E A = 55 ± 5 kJ/mol, which is in agreement with published results.
Microscopic and X-ray diffractometric Cited by: Improvements in ferric chloride leaching of chalcopyrite concentrate / By Frank P. Haver, joint author. Richard D. Baker and joint author. Morton Min Wong. Abstract. Includes bibliographical of access: Internet Topics: Chalcopyrite. imMmiomuoun= of MERAL _ PROLEG ELSEVIER Int.
Miner. Process. 43 () Leaching of chalcopyrite concentrate with ferric chloride Tomás Havl'k a, Milan ~krobian a, Peter Baláz b, Roland Kammel 'Department of Non ferrous Metallurgy, Metallurgical Faculty, Technical University, Kosice, Slovak Republic 'Institute of Geotechnics of the Slovak Academy of Science, Cited by: A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was done to elucidate the leaching mechanism of chalcopyrite with FeCl3.
The leaching rate of chalcopyrite exhibits a half order dependency on the FeCl3 concentration, whereas it is independent of the FeCl2 concentration. The mixed potential of chalcopyrite exhibits a 72 mV decade−1 Cited by: The leach conditions chosen for the 2 stage countercurrent leach experiments were based on literature investigations that indicated an atmospheric leach, near boiling point, at low pH, using relatively fine particles and high concentrations of chloride and copper(II) oxidant are important for effective and efficient leaching of chalcopyrite Cited by: Sato et al.
 have studied the effect of silver chloride on the bioleaching of chalcopyrite concentrate. Leaching of chalcopyrite in acidic ferric chloride has been reported by Al-Harahsheh et. The leaching of natural chalcopyrite was studied in both ferric chloride and ferric sulfate solutions.
The morphology of leaching was studied by using a single chalcopyrite crystal and it appeared quite different with the two by: 1. Introduction.
Ferric and/or cupric chloride leaching of copper from sulfide concentrates has some advantages over sulfate systems in supporting high metal solubility, enhanced redox behaviour, and increased rates of leaching (Dutrizac,Dutrizac,O’Malley and Liddell,Peters, ).Both cuprous and cupric ions are stabilized through complexation with chloride by: NIOSHTIC-2 Publications Search - - Improvements in Ferric Chloride Leaching of Chalcopyrite Concentrate.
A method to recover copper and elemental sulfur from chalcopyrite concentrate, using a ferric chloride leach, cufes2 + 3fecl3 -> cucl + 4fecl2 + 2s, was reported by the federal Bureau of Mines in (report of investigations ). The apparent activation energy for chalcopyrite leaching was found to range from to kJ mol −1, and this suggests that the leaching of chalcopyrite is chemically controlled.
The leaching rate of chalcopyrite increases with an increase in Fe(SO 4) concentration up to mol dm −3, but a further increase of the Fe(SO 4) Cited by: Chloride ions significantly increased chalcopyrite leaching by ferric sulfate at 67 °C and 87 °C, but slowed down the leaching at 50 °C.
At 90 °C, chloride at 5 g dm −3 ( g Cl − g −1 concentrate) increased the copper yield from 60 to % in approximately 2 weeks. Further increase in Cl − concentration did not affect the Cited by: leaching of massive rich copper ore discussed here due to having chalcopyr ite as the main mineral in the ore.
The literat ure about theoretical and prac tical aspects of ferric chloride. Such a process, the ferric chloride leaching of chalcopyrite concentrate, has been developed by the Bureau of Mines Reno Metallurgy Research Center. The process is hydrometallurgical and, since no roasting or smelting of the concentrate takes place, no sulfur dioxide is produced.
The galena concentrate used in ferric chloride leaching was a concentrate from southeastern Missouri. Analysis of the concentrate is shown in Table 1.
The lead concentrate contained primarily galena and small amounts of chalcopyrite, sphalerite, marcasite, and siegenite. The gangue material contained a small concentration of dolomite. In a strong chloride solution the predominant cuprous, cupric, ferrous, and ferric chloride complexes are CuCl3 −2, CuCl+, CuCl2, FeCl2, and FeCl2 + respectively.
The probable dissolution reaction for chalcopyrite in cupric chloride solution is CuFeS2 + 3CuCl+ + 11Cl−2 = 4CuCl3 −2 + FeCl2 + 2S The standard free energy change for this reaction at 25°C and unit activities is Cited by: 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 Cited by: 3. Reagents and leaching procedure The chalcopyrite concentrate was kindly provided by “Caraíba Metais” a pyrometallurgy facility in Bahia, Brazil.
This concentrate contained 69% chalcopyrite, 27% pyrite and 4% of an oxidized copper phase. Chemical analysis showed % iron, % sulphur and % copper. Before leaching, the Author: Praça Tiradentes. The leaching characteristics of chalcopyrite concentrate pre-treated by a new method and leached in water were investigated in this study.
In the pre-treatment phase the chalcopyrite concentrate Author: Tomas Havlik.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.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.
Both models were designed to address the common chloride hydromet problem of product impurity, and they differ with respect to iron deportment. Chloride leaching offers significant advantages Cited by: