Ferric sulphate/chloride leaching of zinc and minor elements from a sphalerite concentrate

Santos, Sílvia M.C.; Machado, Remígio M.; Correia, M. Joana Neiva; Reis, M. Teresa A.; Ismael, M. Rosinda C.; Carvalho, Jorge M.R.

doi:10.1016/j.mineng.2010.02.005

Cited by 51 publications

(19 citation statements)

References 21 publications

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“…Leach solutions were prepared with The sequential extraction method used in this study was originally developed by Tessier et al (1979) [7] and later modified by Li et al (1995) [8]. The extraction method used 1 g of dried sample and was performed under the following conditions and reagents: (1) 3 of aqua regia for 20 min. All solid/liquid separations were done by centrifugation for 30 min at 10,000 rpm (1065× g), designated amounts of supernatant were taken and then diluted with 5% HNO3 solution.…”

Section: Leaching Procedures and Analytical Methodsmentioning

confidence: 99%

“…After leaching, the released Zn ions are recovered as metallic zinc in the electrowinning process [3]. The emission of SO2 during roasting is a serious environmental problem and is governed by strict environmental regulations.…”

Section: Introductionmentioning

confidence: 99%

“…Due to this, the hydrometallurgical route has gained recognition as an alternative process to recover Zn from concentrates [3]. The leaching of sphalerite has been investigated using various leaching media, such as ferric sulphate and chloride with hydrogen peroxide or oxygen [3], ferric sulphate [4], hydrochloric acid with ferric chloride [5], and sulfuric acid with nitric acid [6]. These studies suggested the use of either ferric ions, H2O2, O2, or HNO3 for ZnS oxidation using mineral grade sphalerite or concentrates.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution

Lee

Kwon

Yoo

et al. 2015

Metals

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Abstract:Harbor sediments contaminated with ZnS concentrate were treated by ferric chloride in HCl solution to remove Zn. The sediments were evaluated using Tessier's sequential extraction method to determine the different metal phase associations of Zn. Leaching tests were performed to investigate the effects of experimental factors, such as agitation speed, ferric ion concentration, temperature, and pulp density, on the removal of Zn. The sequential extraction procedure revealed that about 17.7% of Zn in the sediment was associated with soluble carbonate and oxide phases. The results of the leaching tests indicated that higher ferric concentration and temperature increased the leaching efficiencies significantly, while the agitation speed has a negligible effect on the removal of Zn. The removal ratio increased to more than 99% within 120 min of treatment at 1 kmol· m −3 HCl solution with 1 kmol· m −3 Fe 3+ , 10% pulp density, and 400 rpm at 90 °C. The dissolution kinetics of Zn were discussed by comparing the two shrinking core models. It was determined that the kinetic data followed the diffusion controlled model well compared to the surface chemical reaction model. The activation energies were calculated to be 76.9 kJ/mol, 69.6 kJ/mol, and 58.

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Section: Leaching Procedures and Analytical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution

Lee

Kwon

Yoo

et al. 2015

Metals

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“…Zinc is an important non-ferrous metal, second to copper and aluminum in the consumption of non-ferrous metals, mainly applied in steel, metallurgy, machinery, electrical, chemical, light industry, and military fields [1,2]. Currently, more than 85% of zinc is produced through the Roasting-Leaching-Electrowinning (RLE) process, which is the most important method of zinc extraction from sulfide ores and concentrates [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Research on Behavior of Iron in the Zinc Sulfide Pressure Leaching Process

et al. 2020

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Dissolved iron exerts significant effects on mineral leaching, impurity removal, and solution purification in the zinc hydrometallurgy process. To date, iron oxidation and migration behaviors are yet to be fully understood and further research on effective regulation mechanisms of iron is required. In this paper, zinc sulfide concentrate was used as the research object. The behaviors of both Zn and Fe during pressure leaching were investigated for varying temperature, acid addition, and leaching time. At temperature of 100~160 °C, H2SO4/Zn ratio of 0.9:1–1.25:1, and leaching time of 0.5–2.5 h, the zinc extraction increased with temperature, acidity and leaching time. The iron extraction, however, varied differently with increasing temperature, acidity and leaching time: (A) it increased with temperature to 150 °C and then decreased at higher temperature, and (B) displayed an initial increase followed by a decrease with respect to the leaching time. Based on the characteristics of the residue phase, chemical phase analysis was used to analyze the residue in detail. The extent of dissolution of iron-containing minerals and the extent of precipitation of ferric ions during the leaching process were quantitatively calculated.

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“…Zinc is an important metal required for various applications in metallurgical, chemical and textile industries, and is mainly recovered from zinc sulfide concentrates through the conventional hydrometallurgical process, including oxidative roasting, acid leaching, purification and electrowinning steps, in the world [1][2][3]. In the roasting step, zinc ferrite (ZnFe 2 O 4 ) is generated as an inevitable byproduct of the oxidative roasting [4,5].…”

Section: Introductionmentioning

confidence: 99%