Adsorption of Fe(III) on smithsonite surfaces and implications for flotation

Deng, Rongdong; Hu, Y.; Ku, Jiangang; Zuo, Weiran; Yang, Zhengguo

doi:10.1016/j.colsurfa.2017.09.004

Cited by 85 publications

(18 citation statements)

References 31 publications

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“…After sulfidization, amines and xanthates can be used for the flotation of the zinc oxide minerals. However, further activation using metal ions such as Cu 2+ and Pb 2+ is required when xanthate is used as a collector [7][8][9]. In general, sulfidization amine flotation can achieve better performance, resulting in its wide use in industrial production [10,11].…”

Section: Introductionmentioning

confidence: 99%

Improved Understanding of the Sulfidization Mechanism in Amine Flotation of Smithsonite: An XPS, AFM and UV–Vis DRS Study

Liu

Pei

Liu³

et al. 2020

Minerals

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Sulfidization is required in the amine flotation of smithsonite; however, the sulfidization mechanism of smithsonite is still not fully understood. In this work, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS) were used to characterize sulfidized and unsulfidized smithsonite. The XPS and UV–vis DRS analyses showed that smithsonite sulfidization is a transformation of ZnCO3 to ZnS on the smithsonite surfaces. However, this transformation is localized, resulting in the coexistence of ZnCO3 and ZnS or in the formation of ZnS island structures on the sulfidized smithsonite surfaces. AFM height imaging showed that sulfidization can substantially change the surface morphology of smithsonite; in addition, AFM phase imaging demonstrated that sulfidization occurs locally on the smithsonite surfaces. Based on our findings, it can be concluded that smithsonite sulfidization is clearly a heterogeneous solid–liquid reaction in which the solid product attaches at the surfaces of unreacted smithsonite. Smithsonite sulfidization involves heterogeneous nucleation and growth of ZnS nuclei. Moreover, the ZnS might nucleate and grow preferentially in the regions with high reactivity, which might account for the formation of ZnS island structures. In addition, sphalerite-structured ZnS is more likely to be the sulfidization product of smithsonite under flotation-relevantconditions, as also demonstrated by the results of our UV–vis DRS analyses. The results of this study can provide deeper insights into the sulfidization mechanism of smithsonite.

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Section: Introductionmentioning

confidence: 99%

Improved Understanding of the Sulfidization Mechanism in Amine Flotation of Smithsonite: An XPS, AFM and UV–Vis DRS Study

Liu

Pei

Liu³

et al. 2020

Minerals

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“…However, on the bastnaesite surfaces treated with strontium ions (Figure 6), an Sr 3d peak, positioned at 134.6eV, appeared, indicating the adsorption of strontium ions. Metal ions have been proven to be adsorbed on some carbonate minerals, by complexing with surface CO [24,38], while the binding energy of Sr 3d in SrCO3 is 133.2 eV [39], apparently different from that of adsorbed Sr in this work, indicating the strontium ions may not adsorb by complexing with surface CO of bastnaesite surfaces to form SrCO3.…”

Section: Adsorption Mechanism Of Strontium Ions On Bastnaesite Surfacesmentioning

confidence: 75%

“…Ren J found that the depression of monazite is attributed to the preferential adsorption of Al 3+ on monazite surface PO 3− 4 sites [23]. Deng et al [24] reported that iron ions sharply decreased smithsonite flotation recovery even at a low concentration. The iron ions adsorbed to the mineral surfaces via both chemical and electrostatic interactions.…”

Section: Introductionmentioning

confidence: 99%

Depression Mechanism of Strontium Ions in Bastnaesite Flotation with Salicylhydroxamic Acid as Collector

Cao

Liao

et al. 2018

Minerals

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Abstract:Metal ions are widely present in flotation pulp. Metal ions change solution chemistry and mineral surface properties, consequently affecting mineral flotation. In this work, the effect of strontium ions on bastnaesite flotation with salicylhydroxamic acid (SHA) was investigated by microflotation tests, contact angle measurements, zeta-potential measurements, and X-ray photoelectron spectroscopy (XPS) analysis. Microflotation tests confirmed that the addition of strontium ions decreased bastnaesite floatability, compared with that in the absence of strontium ions. Contact angle measurements suggested that the pretreatment of strontium ions decreased SHA adsorption. Zeta potential measurements confirmed that the bastnaesite was depressed by the adsorption of positively charged strontium species, and the lower adsorption capacity of SHA onto the bastnaesite surfaces was obtained after modifying with strontium ions. XPS analysis demonstrated that strontium ions adsorbed onto the bastnaesite surfaces through the interaction between strontium ions and oxygen atoms of surface ≡ CeOH 0 groups. This occurrence hindered surface Ce sites which chelated with SHA and therefore, decreased bastnaesite floatability.

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“…44 For the Fe 2p (3/2) spectrum of arsenopyrite roasted with calcium hydroxide (Figure 9b), a signal appeared at 710.94 eV, which was due to iron belonging to Fe 2 O 3. 46,47 The S 2p (3/2) spectra of unroasted arsenopyrite are shown in Figure 9c, which contains four double peaks. 46,47 The S 2p (3/2) spectra of unroasted arsenopyrite are shown in Figure 9c, which contains four double peaks.…”

Section: Xps Analysis Of the Surfaces Of Arsenopyrite And Calcine Bmentioning

confidence: 99%

“…45 This indicated that during solidification roasting, Fe (II) in arsenopyrite was oxidized to Fe (III). 46,47 The S 2p (3/2) spectra of unroasted arsenopyrite are shown in Figure 9c, which contains four double peaks. The doublet of each peak was limited to a binding energy 1.18 eV higher than the main peak, half the strength of the main peak, with the same binding energy.…”

Section: Xps Analysis Of the Surfaces Of Arsenopyrite And Calcine Bmentioning

confidence: 99%

Solidification of sulfur and arsenic in gold concentrate and leaching of the gold by thiosulfate

et al. 2020

Asia-Pacific J Chem Eng

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The processing of refractory minerals rich in arsenic and sulfur often causes give off arsenic and sulfur contamination during roasting and oxidation pretreatments. In this paper, the solidification of elemental arsenic and sulfur by adding calcium-containing compounds (calcium oxide, calcium carbonate, and calcium hydroxide) during roasting and oxidation was investigated with the aim of reducing environmental pollution. At the same time, the gold leaching from residues produced by solidification roasting and oxidation using nontoxic and environmentally friendly green copperammonia-thiosulfate method was also studied. The results indicated that a relatively better solidification effect of SO 2 and As 2 O 3 was achieved by adding Ca (OH) 2 , with a solidification efficiency for sulfur and arsenic as 84.67% and 50%, respectively. When copper-ammonia-thiosulfate leaching was carried out on the residues after solidification roasting, it was found that a 90% gold leaching percentage was obtained. Via characterization using Brunauer-Emmett-Teller surface area, scanning electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy, it was also found that the arsenic and sulfur in arsenopyrite were oxidized into stable and safe sulfates and arsenates after solidification. The results show that solidification roasting oxidation is an efficient and environmentally friendly pretreatment method, and the gold in the calcine can be effectively leached out via the green copper-ammonia-thiosulfate system. K E Y W O R D Sgold leaching, refractory gold concentrate, solidification of sulfur and arsenic, thiosulfate

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Adsorption of Fe(III) on smithsonite surfaces and implications for flotation

Cited by 85 publications

References 31 publications

Improved Understanding of the Sulfidization Mechanism in Amine Flotation of Smithsonite: An XPS, AFM and UV–Vis DRS Study

Improved Understanding of the Sulfidization Mechanism in Amine Flotation of Smithsonite: An XPS, AFM and UV–Vis DRS Study

Depression Mechanism of Strontium Ions in Bastnaesite Flotation with Salicylhydroxamic Acid as Collector

Solidification of sulfur and arsenic in gold concentrate and leaching of the gold by thiosulfate

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