The leaching kinetics of a zinc sulphide concentrate in acid ferric sulphate

Souza, Adelson Dias de; Piña, Pablo; Leão, Versiane Albis; Silva, Carlos Antônio da; Siqueira, Priscila de Freitas

doi:10.1016/j.hydromet.2007.05.008

Cited by 129 publications

(42 citation statements)

References 20 publications

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“…Based on the calculations, the correlation coefficients (R2) for the diffusion-controlled model are higher compared to that of the reaction-controlled model. Previous studies on ZnS leaching with FeCl3 reported that the leaching behavior of Zn followed the reaction-controlled model [5,9,10] while others proposed that the reaction was controlled by both the reaction-and diffusion-controlled model [4,11]. In the current study, the kinetic model parameters indicated that the diffusion-controlled model is more suitable to explain the kinetic behavior of Zn removal.…”

Section: Resultsmentioning

confidence: 54%

“…Studies on the dissolution kinetics of ZnS were reported previously and investigations were carried out using pure sphalerite crystals [9,10], low-grade calcareous sphalerite [11], and ZnS concentrate [4,5]. Activation energy values were calculated using the shrinking core model and the Dickson and Heal model [4,5,[9][10][11] and were determined to be 27.5 kJ/mol in sulfuric acid [4] and 42-49.2 kJ/mol in hydrochloric acid [5,[9][10][11], respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Activation energy values were calculated using the shrinking core model and the Dickson and Heal model [4,5,[9][10][11] and were determined to be 27.5 kJ/mol in sulfuric acid [4] and 42-49.2 kJ/mol in hydrochloric acid [5,[9][10][11], respectively. The shrinking core model could be expressed by [5,12]:…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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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“…During the next six days, carbonate mineral in smelting slag was gradually reduced, as was the leachate pH value. As can be seen in Table 4, there exists in the smelting slag Al 3+ , which may react with OH -and then change into 3 , which may in turn intensify the Oxidative dissolution of sulfide [37][38] and result in the reduction of leachate pH value. Fig.…”

Section: Content and Occurrence State Of Metal(loid)s In Sb Smelting mentioning

confidence: 99%

Release Law of Sb, As, and Hg in Antimony Smelting Slag Under Simulated Acid Rain

Zhou¹,

Li²,

Ren³

et al. 2017

Pol. J. Environ. Stud.

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The exploitation and smelting of heavy metals causes serious environmental pollution, which has received extensive attention from researchers all over the world [1][2][3]. The smelting slag produced by the smelting mines is not only land-occupying, but also causes lasting environmental pollution, for large amounts of harmful elements in the smelting slag are released after rain [4][5][6][7]. As the world's largest antimony (Sb) producer, China produces on average 80% of global Sb annually [8].Xikuangshan (XKS) in Hunan, the world's largest Sb mine, is reported to produce 25% of the world's total. The XKS mine has been mining and smelting for almost 120 years. Its longtime and large-scale mining and smelting has produced large amounts of smelting slag. With surface runoff and precipitation infiltration, harmful elements like Sb and the associated elements As and Hg have been released, threatening the environment and human beings [10][11][12][13][14]. When an excessive amount of Sb, As, or Hg enters the human body, it will cause diseases to the liver, skin, tumors, respiratory and cardiovascular systems, and even cancer [15][16][17][18][19]. Sb, As, Hg, and their compounds are listed as pollutants of priority interest by the United States Pol. J. Environ. Stud. Vol. 26, No. 2 (2017), 925-933 Original Research AbstractThis study takes the Southern antimony smelting slag depot in Xikuangshan (XKS) Sb mine in the city of Lengshuijiang, Hunan, China, as the research object and explores the release law of Sb, As, and Hg in smelting slag under different pH-value simulated acid rain by a semi-dynamic leaching experiment of simulating the local rain. The results show that the leachate pH value is positively correlated with the pH value of simulated acid rain, while the leachate conductivity is negatively correlated with it. The leaching rates of As and Hg are negatively correlated with the pH value of the simulated acid rain, while the leaching rate of Sb is positively correlated with it; in the leaching process, the leachate pH value goes downward slowly after shooting up, but the leachate conductivity is continuously reduced; the releasing process of Sb, As, and Hg consists of two stages, and their leaching rate forms such an order as Sb > Hg > As. The diffraction peak intensity of the main mineral composition of quartz and calcite decreases significantly after leaching; the smelting slag's surface becomes less rough than before leaching, with fewer pores and edges, and the contents of S, Si, Al, Fe, Ca, and Sb on the slag surface decrease while the content of O, As, and Hg increases.Keywords: antimony smelting slag, simulated rain, metal(loid)s, release law *e-mail: zsjaw0745@sina.com DOI: 10.15244/pjoes/65470 926 Zhou S., et al. Environmental Protection Agency [20] and the European Union [21].Until the present, studies at home and abroad are mainly on minerals' adsorption of Sb (III and V) and its desorption, as well as Sb smelting slag's impact on the surrounding environment [22][23][24][25][26][27], but f...

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Electric‐oxidation kinetics of molybdenite concentrate in acidic NaCl solution

Cao

Zhong

et al. 2009

Can J Chem Eng

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The electric-oxidation kinetics of molybdenite concentrate in NaCl electrolyte was investigated in this study. The effects of liquid-to-solid ratio, stirring speed, and concentration of NaCl on the dissolution rate were determined. It was found that the dissolution rate increases with increase in liquid-to-solid ratio, stirring speed, and concentration of NaCl. A shrinking particle model is presented to describe the dissolution and to analyse the data. The apparent activation energy of this dissolution process was found to be 8.2 kJ/mol; it was established that the leaching process is mainly controlled by diffusion, and the kinetics formula of this research system can be expressed as: k = 0.0207C 1.04 NaCl exp(−8200/RT ).Dans cetteétude, on examine la cinétique de l'oxydationélectrique d'un concentré de molybdénite dans unélectrolyte de NaCl. Les effets du rapport liquide-solide, de la vitesse d'agitation et de la concentration de NaCl sur le taux de dissolution ontété déterminés. Il aété découvert que le taux de dissolution augmente avec le rapport liquide-solide, la vitesse d'agitation et la concentration de NaCl. Un modèle de contraction de particule est présenté pour décrire la dissolution et analyser les données. L'énergie d'activation apparente de ce processus de dissolution aété evaluéeà 8,2KJ/mol. Il aétéétabli que le processus de lixiviation est principalement contrôlé par diffusion et la formule cinétique de ce système de recherche peutêtre exprimée sous la forme: k = 0,0207C 1.04 NaCl exp(−8200/RT).

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The leaching kinetics of a zinc sulphide concentrate in acid ferric sulphate

Cited by 129 publications

References 20 publications

Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution

Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution

Release Law of Sb, As, and Hg in Antimony Smelting Slag Under Simulated Acid Rain

Electric‐oxidation kinetics of molybdenite concentrate in acidic NaCl solution

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