Sulfidation roasting of lead and zinc carbonate with sulphur by temperature gradient method

Zheng, Yong-xing; Liu, Wei; Qin, Wenqing; Jiao, Fen; Han, Junwei; Yang, Kang; Luo, Honglin

doi:10.1007/s11771-015-2681-9

Cited by 27 publications

(10 citation statements)

References 28 publications

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“…In addition, it was found that the remaining percentage of the sample was more than that of the single pyrite, confirming that the solid-gas reaction occurred (Eq. ( 8 )) 20 , 24 . In other words, the released elemental sulfur from pyrite was fixed in form of ZnS, resulting in mass increase of the remaining sample.…”

Section: Resultsmentioning

confidence: 99%

“…Sulfidization roasting were usually performed in the temperature range of 600–750 °C 20 , 24 . In order to examine the flotation performances of zinc oxide minerals after treatment, the roasting temperature was determined as 650 °C.…”

Section: Methodsmentioning

confidence: 99%

“… 19 and Zheng et al . 20 investigated the sulfidization of zinc oxide mineral with elemental sulfur at high temperatures and their sulfidization extents could reach above 90%. Zheng 8 studied mineralogical reconstruction of the lead smelter slag using pyrite as vulcanizing reagent and zinc recovery.…”

Section: Introductionmentioning

confidence: 99%

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Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Zheng

Wang

et al. 2018

Sci Rep

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In this paper, formation of zinc sulfide species during roasting of ZnO with FeS2 was investigated and its contribution on flotation was illustrated. The evolution process, phase and crystal growth were investigated by thermogravimetry (TG), X-Ray diffraction (XRD) along with thermodynamic calculation and scanning electron microscopy-Energy-dispersive X-ray spectroscopy (SEM-EDS), respectively, to interpret the formation mechanism of ZnS species. It was found that ZnS was initially generated at about 450 °C and then the reaction prevailed at about 600 °C. The generated FexS would dissolve into ZnS and then form (Zn, Fe)S compound in form of Fe2Zn3S5 when temperature increased to about 750 °C. This obviously accelerated ZnS phase formation and growth. In addition, it was known that increasing of ZnO dosage had few effects on the decomposition behavior of FeS2. Then, flotation tests of different zinc oxide materials before and after treatment were performed to further confirm that the flotation performances of the treated materials could be obviously improved. Finally, a scheme diagram was proposed to regular its application to mineral processing. It was systematically illustrated that different types of ZnS species needed to be synthetized when sulfidization roasting-flotation process was carried out to treat zinc oxide materials.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Zheng

Wang

et al. 2018

Sci Rep

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“…Since the iron contained in marmatite is Fe 2+ , the results demonstrate that natural marmatite and synthetic Zn 1− x Fe x S can be oxidized from their surfaces in air, which may be another reason that marmatite is more difficult than sphalerite to be floated with xanthate 61 62 63 , and the oxidation of synthetic Zn 1− x Fe x S is easier than marmatite. This may be a reason that natural ZnS is easier than synthetic ZnS to be floated 64 65 . The Zn 2p peaks of the roasted samples only have slight shift compared with that of marmatite (1021.8 eV) 66 , indicating that most of ZnO has been converted into ZnS after the sulfidation roasting.…”

Section: Resultsmentioning

confidence: 99%

Mechanism study on the sulfidation of ZnO with sulfur and iron oxide at high temperature

Han

Liu

Zhang

et al. 2017

Sci Rep

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The mechanism of ZnO sulfidation with sulfur and iron oxide at high temperatures was studied. The thermodynamic analysis, sulfidation behavior of zinc, phase transformations, morphology changes, and surface properties were investigated by HSC 5.0 combined with FactSage 7.0, ICP, XRD, optical microscopy coupled with SEM-EDS, and XPS. The results indicate that increasing temperature and adding iron oxide can not only improve the sulfidation of ZnO but also promote the formation and growth of ZnS crystals. Fe2O3 captured the sulfur in the initial sulfidation process as iron sulfides, which then acted as the sulfurizing agent in the late period, thus reducing sulfur escape at high temperatures. The addition of carbon can not only enhance the sulfidation but increase sulfur utilization rate and eliminate the generation of SO2. The surfaces of marmatite and synthetic zinc sulfides contain high oxygen due to oxidation and oxygen adsorption. Hydroxyl easily absorbs on the surface of iron-bearing zinc sulfide (Zn1−xFexS). The oxidation of synthetic Zn1−xFexS is easier than marmatite in air.

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“…The sulfidation of a nickeliferous lateritic ore in the presence of sulfur indicated that the nickel oxide can be selectively sulfidized to a nickeliron sulfide at 400-550 o C [20]. Similarly, studies on sulfidation roasting of cervantite [21], chalcopyrite [22], lead-zinc oxide ore [23], as well as zinc and lead carbonate [24] were also reported. The oxides or carbonates were likely converted to sulfides which can be recovered by flotation.…”

Section: Introductionmentioning

confidence: 95%

Reductive roasting of iron-rich manganese oxide ore with elemental sulfur for selective manganese extraction

You

Peng

et al. 2017

J min metall B Metall

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It is very important to selectively reduce manganese oxide over iron oxide for extraction of Mn from iron-rich manganese ore. In this study, reductive roasting of an iron-rich manganese oxide ore with elemental sulfur as reductant was investigated. The experimental results demonstrated that manganese dioxide can be selectively reduced with elemental sulfur and extracted via acid leaching, which was largely depended on the sulfur addition. Lower sulfur addition (S/Mn molar ratio<1.0) results in higher selectivity, which is independent of roasting temperature. More than 95% manganese and less than 10% iron were extracted through acid leaching under the roasting conditions of 400-600 o C with S/Mn molar ratio of 0.6. The contents of manganese sulfide and sulfate in the roasted product increased with increasing sulfur addition, while they decreased distinctly at temperatures above 550 o C. The thermodynamic analysis also proved that manganese dioxide is more easily reduced than iron oxide by sulfur at 300-900 K. The phase transformations during reductive roasting revealed that sulfides (MnS and FeS 2 ) were favored at temperatures lower than 550 o C whereas the oxides (MnFe 2 O 4 and Fe 3 O 4 ) were predominant at higher temperatures. The reduction of iron oxide mainly occurred at large sulfur additions (S/Mn>2.0) and the roasting temperature exerted a significant impact on the phase composition of roasted product.

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Sulfidation roasting of lead and zinc carbonate with sulphur by temperature gradient method

Cited by 27 publications

References 28 publications

Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Mechanism study on the sulfidation of ZnO with sulfur and iron oxide at high temperature

Reductive roasting of iron-rich manganese oxide ore with elemental sulfur for selective manganese extraction

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