Improvement of chalcopyrite dissolution in acid media using polar organic solvents

Solis-Marcíal, O.J.; Lapidus, G.T.

doi:10.1016/j.hydromet.2012.11.006

Cited by 41 publications

(14 citation statements)

References 27 publications

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“…In this case, the DMSO10 experiment was performed with 50 mL of DMSO, capable of dissolving about 13.3% of total sulphur from chalcopyrite oxidation. Additionally, DMSO, also a polar solvent, may not act as a stabiliser for hydrogen peroxide as reported for other polar solvents such as acetone and ethylene glycol (Jorjani and Ghahreman, 2017;Mahajan et al, 2007;Solis-Marcíal and Lapidus, 2013).…”

Section: Removing Sulphur Passivation By Tetrachloroethylenementioning

confidence: 93%

“…Researchers have also studied the effect of polar solvents on chalcopyrite leaching and reported enhanced leaching after adding acetone (Solis-Marcíal and Lapidus, 2013), or ethylene glycol (Jorjani and Ghahreman, 2017;Mahajan et al, 2007;Solis-Marcíal and Lapidus, 2013). These solvents have much low sulphur solubilities, and their effectiveness in enhancing chalcopyrite leaching has been attributed to their role in preventing the decomposition of the oxidising agent hydrogen peroxide rather than removing sulphur from the grain surface (Jorjani and Ghahreman, 2017;Mahajan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation

et al. 2020

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Section: Removing Sulphur Passivation By Tetrachloroethylenementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation

et al. 2020

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“…For this reason, the leaching of chalcopyrite is typically performed under oxidizing conditions or at high temperatures and pressures. Solis-Marcial and Lapidus found that the formation of a passivation layer could be limited by leaching with H 2 SO 4 /H 2 O 2 in the presence of acetone or ethylene glycol in the aqueous phase [103]. The enhanced recovery of copper was attributed to the greater stability of the copper(I) ion in organic solvents.…”

Section: Solvent Leaching Of Copper Oresmentioning

confidence: 99%

Solvometallurgy: An Emerging Branch of Extractive Metallurgy

Binnemans

Jones

2017

J. Sustain. Metall.

221

187

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This position paper introduces the reader to the concept of solvometallurgy, the term used to describe the extraction of metals from ores, industrial process residues, production scrap, and urban waste using non-aqueous solutions. Here, non-aqueous is not used to imply anhydrous, but rather a low water content. The unit operations are as follows: solvent leaching; separation of the residue; purification of the leach solution by non-aqueous solvent extraction or non-aqueous ion exchange; and metal recovery by precipitation or electrolysis in non-aqueous electrolytes. Solvometallurgy is similar to hydrometallurgy in that both the branches of extractive metallurgy use lowtemperature processes, but with solvometallurgy, there is no discrete water phase. Both branches use organic or inorganic solvents (excluding water in the case of solvometallurgy). However, for solvometallurgical processes to be sustainable, they must be based on green solvents, which means that all toxic or environmentally harmful solvents must be avoided. Solvometallurgy is complementary to pyrometallurgy and hydrometallurgy, but this new approach offers several advantages. First, the consumption of water is very limited, and so the generation of wastewater can be avoided. Second, the leaching and solvent extraction can be combined to form a single step, resulting in more simplified process flow sheets. Third, solvent leaching is often more selective than leaching with acidic aqueous solutions, leading to reduced acid consumption and fewer purification steps. Fourth, solvometallurgy is useful for the treatment of ores rich in soluble silica (e.g., eudialyte) because no silica gel is formed. In short, solvometallurgy is in a position to help develop the near-zero-waste metallurgical processes, and with levels of energy consumption that are much lower than those with the high-temperature processes. The Technology Readiness Level (TRL) of this emerging branch of extractive metallurgy is still low (TRL = 3-4), which is a disadvantage for short-term implementation, but offers a great opportunity for further research, development, and innovation.

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“…Although extensive research on chalcopyrite leaching has been conducted, most studies have focused on using aqueous solutions, and few studies have investigated the use of organic solvents for the leaching of chalcopyrite. Solis-Marcíal and Lapidus investigated the use of polar organic solvents in combination with sulfuric acid (H 2 SO 4 ) media for chalcopyrite leaching [5,6]. They found that the use of acetone (CH 3 COCH 3 ), ethylene glycol (CH 2 OHCH 2 OH), 2propanol (CH 3 CH(OH)CH 3 ), or methanol (CH 3 OH) together with sulfuric acid solutions favors the oxidative leaching of chalcopyrite, which results in more copper extraction in a relatively short time under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Chalcopyrite Leaching in a Dimethyl Sulfoxide Solution Containing Copper Chloride

Takatori

Kato

Yoshimura

et al. 2021

Mining, Metallurgy & Exploration

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Chalcopyrite (CuFeS2) is the most refractory copper mineral when treated in conventional sulfate media leaching systems. This is the first study to examine the use of a dimethyl sulfoxide (CH3SOCH3, DMSO) solution containing copper chloride (CuCl2) for the leaching of chalcopyrite. Leaching experiments for a copper concentrate composed mainly of chalcopyrite were conducted at ambient pressure at 313–413 K. The leaching fractions of Cu, Fe, S, Au, and As were investigated. It was found that 90% of the Cu was extracted in 2 h, and 94% was extracted in 4 h at 373 K, which is competitive with other conventional processes. A DMSO solution containing CuCl2 could selectively dissolve the valuable metals Cu and Au from chalcopyrite, but leave minerals with little economic value such as pyrite (FeS2) and As in the residue. Chalcopyrite is oxidized by cupric ion in proportion to the stoichiometric ratio of Cu in the concentrate to the initial cupric ion in the DMSO solution, which is enhanced by the presence of oxygen below 373 K.

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Improvement of chalcopyrite dissolution in acid media using polar organic solvents

Cited by 41 publications

References 27 publications

Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation

Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation

Solvometallurgy: An Emerging Branch of Extractive Metallurgy

Chalcopyrite Leaching in a Dimethyl Sulfoxide Solution Containing Copper Chloride

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