Kinetics of chalcopyrite leaching in either ferric sulphate or cupric sulphate media in the presence of NaCl

Veloso, Tácia Costa; Peixoto, Johne Jesus Mol; Pereira, Márcio Salgado; Leão, Versiane Albis

doi:10.1016/j.minpro.2016.01.014

Cited by 51 publications

(19 citation statements)

References 36 publications

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“…This agrees with the observations of Miki et al [13] who reported that the copper recovery from synthetic covellite increased marginally with an increasing chloride concentration in the range of 7-90 g/L. extensive research reported for copper ores with chloride, even for the leaching of concentrates and primary sulfides copper ores [26,[30][31][32][33][34][35].…”

Section: Effect Of Strong Chloride Mediasupporting

confidence: 91%

“…The testing of a high chloride media similar to seawater is motivated by the scarcity of fresh water and the potential use of this resource in copper leaching [27][28][29]. There are no other studies in the literature that use a media similar to seawater for copper leaching, although there has been extensive research reported for copper ores with chloride, even for the leaching of concentrates and primary sulfides copper ores [26,[30][31][32][33][34][35].…”

Section: Effect Of Strong Chloride Mediamentioning

confidence: 99%

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Leaching of White Metal in a NaCl-H2SO4 System under Environmental Conditions

et al. 2019

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The effect of NaCl on the leaching of white metal from a Teniente Converter was investigated in NaCl-H2SO4 media under environmental conditions. The copper dissolution from white metal was studied using ferric ions in the range of 1–10 g/L, NaCl in the range of 30–210 g/L, and sulfuric acid in the range of 10–50 g/L. The test without NaCl produced a dissolution of 55%; through the addition of NaCl, the dissolution increased to nearly 90%. The effect of sulfuric acid on the copper dissolution was not significant in the studied range, as the excess sulfuric acid simply increased the iron precipitation. The positive effect of NaCl seems to be related to the action of chloro-complex oxidizing agents in relation to the Cu+2/Cu+ couple. A simplified two-stage mechanism is proposed for the leaching of white metal. In the first stage, the white metal produces covellite and Cu2+, and in the second stage it produces elemental sulfur and Cu2+. The first stage is very rapidly compared to the second stage.

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Section: Effect Of Strong Chloride Mediasupporting

confidence: 91%

Section: Effect Of Strong Chloride Mediamentioning

confidence: 99%

Leaching of White Metal in a NaCl-H2SO4 System under Environmental Conditions

et al. 2019

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“…Leaching is an alternative metallurgical treatment for chalcopyrite, although chalcopyrite tends to form passive layers around particles during leaching, which results in a slow dissolution rate and low levels of copper extraction [4,5]. Many researchers have reported a higher percentage of copper extraction in acid-chloride media than acid-sulfate media to leach chalcopyrite [6][7][8][9][10][11][12]. A chloride-acid media promotes the formation of copper chloride-complexes [13] and iron chloride-complexes [14] that modify the redox potential (ORP), according Equations (1) and (2):…”

Section: Introductionmentioning

confidence: 99%

Accelerating Copper Leaching from Sulfide Ores in Acid-Nitrate-Chloride Media Using Agglomeration and Curing as Pretreatment

et al. 2019

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This work investigates the effect of an agglomeration and curing pretreatment on leaching of a copper sulfide ore, mainly chalcopyrite, using mini-columns in acid-nitrate-chloride media. Ten pretreatment tests were conducted to evaluate different variables, namely the addition of nitrate as NaNO 3 (11.7 and 23.3 kg/ton), chloride as NaCl (2.1 and 19.8 kg/ton), curing time (20 and 30 days) and repose temperature (25 and 45 • C). The optimum copper extraction of 58.6% was achieved with the addition of 23.3 kg of NaNO 3 /ton, 19.8 kg of NaCl/ton, and after 30 days of curing at 45 • C. Under these pretreatment conditions, three samples of ore were leached in mini-columns. The studied parameters were temperature (25 and 45 • C) and chloride concentration (20 and 40 g/L). The optimum copper extraction of 63.9% was obtained in the mini-column leaching test at 25 • C, with the use of 20 g/L of chloride. A higher temperature (45 • C) and a higher chloride concentration (40 g/L) negatively affected the extraction. The pretreatment stage had favorable effects, in terms of accelerating copper dissolution and improving leaching of copper sulfide ore in acid-nitrate-chloride media. Waste salts from caliche industry and waste brine from reverse osmosis can be used for providing the nitrate and chloride media.

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“…In order to determine the most probable conditions of the desired products formation during sulfide industrial waste leaching in nitric acid, as well as the mutual influence of the produced pulp components on the performance of the process, the kinetics evaluation of multicomponent sulfide industrial waste in a nitric medium was studied using mathematical methods [9].…”

Section: Methodsmentioning

confidence: 99%

Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

Rogozhnikov¹,

Dizer²,

Shoppert³

2017

Kms

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Thermodynamic and kinetic features studies of polymetallic sulfide industrial waste nitric acid leaching were carried out. Elemental and phase composition of investigated raw material were studied with X-ray diffraction and electron microscopy methods. Calculations of the Gibbs energy change for the likely reactions of sulfide minerals with nitric acid were performed. In order to determine the most probable conditions of the sulfide industrial waste leaching in nitric acid, as well as the mutual influence of the produced pulp components on the performance of the process, the kinetics evaluation of multicomponent sulfide industrial waste in a nitric medium was studied using mathematical methods.

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Kinetics of chalcopyrite leaching in either ferric sulphate or cupric sulphate media in the presence of NaCl

Cited by 51 publications

References 36 publications

Leaching of White Metal in a NaCl-H2SO4 System under Environmental Conditions

Leaching of White Metal in a NaCl-H2SO4 System under Environmental Conditions

Accelerating Copper Leaching from Sulfide Ores in Acid-Nitrate-Chloride Media Using Agglomeration and Curing as Pretreatment

Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

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