Improved hemimorphite flotation using xanthate as a collector with S(II) and Pb(II) activation

Jia, Kai; Feng, Qiming; Zhang, Guofan; Shi, Qing; Luo, Yi; Li, Changbin

doi:10.1007/s12613-018-1634-3

Cited by 23 publications

(2 citation statements)

References 53 publications

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“…In the presence of Na 2 S·9H 2 O + Pb 2+ (Figure 8b), the s 2 p peaks were fitted reasonably well with two components around 161.39 and 160.58 eV, which correspond to the characteristic values of S in ZnS and PbS, respectively [30,36,37]. As expected, the ZnS content was reduced after the addition of Pb 2+ , indicating that some of the zinc sulfide was converted into PbS [26]. Figure 8c presents the s 2 p spectra of hemimorphite treated with the strengthening-sulfidation process.…”

Section: Xpssupporting

confidence: 68%

“…The deposits were not easily removed from the mineral surface, even when the surface was repeatedly washed with high-purity water. This is one of the reasons-in addition to the ion-exchange reaction between Pb ions and zinc sulfide forming lead sulfide-why Pb ions can activate sulfidized hemimorphite [18,26]. The surfaces of the samples pretreated with Pb 2+ exhibited numerous irregular bright regions.…”

Section: Semmentioning

confidence: 99%

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Strengthening Sulfidation Flotation of Hemimorphite via Pretreatment with Pb2+

et al. 2019

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The conventional sulfidation-xanthate flotation process that consists of sulfidization with sodium sulfide, activation by heavy-metal ions, and collection with xanthate is not sufficiently efficient for treating hemimorphite, and the dosages of the sulfurizing reagent and metal ions are large. In this study, the sulfidation flotation (Pb 2+ + Na 2 S + Pb 2+ + xanthate) of hemimorphite was strengthened by pretreating with Pb 2+ before sulfidation. Microflotation test results indicated that the recovery of hemimorphite increased by 5-10% after pretreatment with Pb 2+ . The comprehensive results of adsorption experiments, scanning electron microscopy-energy-dispersive X-ray spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy indicated that a large amount of Pb 2+ was adsorbed on the hemimorphite surface and entered the lattice, forming Zn (4−x) Pb x Si 2 O 7 (OH) 2 ·H 2 O. The newly formed component had an increased amount of surface sulfidation active sites and had the effect of induced crystallization, making the surface more effective for sulfidation. After the Pb 2+ was added to the pulp, a large number of uniform and dense PbS species were formed on the hemimorphite surface, increasing the number of adsorption sites for xanthate and reducing the competitive adsorption of residual S 2− on the xanthate.

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