Written in English
|Statement||by Peter Alan Haunschild.|
|The Physical Object|
|Pagination||x, 126 leaves, bound :|
|Number of Pages||126|
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: Leaching of chalcopyrite in acidic ferric chloride has been reported by Al-Harahsheh et al. . Sodium chloride has shown a positive effect on chalcopyrite dissolution resulting enhancement of. 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. This study examines the effect of redox potential on silver-catalyzed chalcopyrite leaching. Leaching tests were carried out in stirred Erlenmeyer flasks with g chalcopyrite mineral, 1 g Ag/kg Cu and mL of a sulphate solution of Fe 3+ /Fe 2+ (with redox potential ranging between and mV Ag/AgCl) at pH , rpm and 35°C or 68 °C.
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. leaching of chalcopyrite with ferric sulfate was the transport process through the sulfur product layer. Similar behaviour has also been reported in ferric chloride leaching . 2 Recently, Outokumpu has developed a novel leaching process, HydroCopperTM. In this process. 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 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. , Havlík, Škrobian et. leaching of chalcopyrite with ferric sulfate [Fe 2 (SO 4) 3] Al-Harahsheh () used ferric chloride leaching. of copper from chalcopyrite. The effect of stirring speed.
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-. 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. () found that, in a temperature range between 50 and °C, the chalcopyrite leaching rate was linear in chloride medium and parabolic in sulphate by: The redox potential dependence of chalcopyrite leaching in acidic ferric chloride solutions was investigated using a specially designed batch leaching setup under different temperatures with varying concentrations of Fe 3+, Cu 2+ and HCl. From the redox potential data recorded as a function of time, the amount of extracted copper was calculated. The leaching kinetics of natural chalcopyrite crystals with ferric sulfate was studied. The morphology of the leached chalcopyrite and the electrochemical properties of chalcopyrite electrodes also were investigated. The leaching of chalcopyrite showed parabolic-like .