Zinc recovery from franklinite by sulphation roasting

Zhang, Yali; Yu, Xiaojiao; Li, Xiaobin

doi:10.1016/j.hydromet.2011.07.002

Cited by 53 publications

(25 citation statements)

References 15 publications

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“…Later increases sharply from 400 to about 800 • C, it can be concluded that the oxidation reaction of zinc sulfide proceed gradually according to the temperature condition of zinc sulfide oxidation reaction [19,20], and there is a main phase transformation in this temperature range as well, Figure 2 also can prove that there are some reactions from 400 to about 800 • C. Lastly drop sharply to an almost stable value, which means main reaction have finished by compared with the dielectric properties of zinc oxide we have measured. The dielectric loss factor is the function of frequency because of dipolar rotation and ionic conduction, and ionic conduction is the dominant mechanism at lower frequencies while dipolar rotation is the main source of dielectric loss at higher microwave frequencies [21,22], as shown in the following equation: The dielectric loss factor at 915 MHz from Figure 3b is smaller than that at 2450 MHz from Figure 3d when the temperature under 400 °C, but reverse results when the temperature above 400 °C.…”

Section: Dielectric Properties Of Zinc Sulfide Concentratementioning

confidence: 98%

Dielectric Properties of Zinc Sulfide Concentrate during the Roasting at Microwave Frequencies

Guang-jun

Yang

et al. 2017

Minerals

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Abstract:Microwave technology has a potential application in the extraction of zinc from sulphide ores, knowledge of the dielectric properties of these ores plays a major role in the microwave design and simulation for any process. The dielectric properties of zinc sulfide concentrate for two different apparent densities-1.54 and 1.63 g/cm 3 -have been measured by using the resonance cavity perturbation technique at 915 and 2450 MHz during the roasting process for the temperature ranging from room temperature to 850 • C. The variations of dielectric constant, the dielectric loss factor, the dielectric loss tangent and the penetration depth with the temperature, frequency and apparent density have been investigated numerically. The results indicate that the dielectric constant increases as the temperature increases and temperature has a pivotal effect on the dielectric constant, while the dielectric loss factor has a complicated change and all of the temperature, frequency and apparent density have a significant impact to dielectric loss factor. Zinc sulfide concentrate is high loss material from 450 to 800 • C on the basis of theoretical analyses of dielectric loss tangent and penetration depth, its ability of absorbing microwave energy would be enhanced by increasing the apparent density as well. The experimental results also have proved that zinc sulfide concentrate is easy to be heated by microwave energy from 450 to 800 • C. In addition, the experimental date of dielectric constant and loss factor can be fitted perfectly by Boltzmann model and Gauss model, respectively.

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Section: Dielectric Properties Of Zinc Sulfide Concentratementioning

confidence: 98%

Dielectric Properties of Zinc Sulfide Concentrate during the Roasting at Microwave Frequencies

Guang-jun

Yang

et al. 2017

Minerals

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“…A problem of this process is a generation of considerable amount of zinc leaching residue [1,2]. Mineralogical analysis shows that the zinc and iron are mainly in the form of zinc ferrite (ZnFe 2 O 4 ) [3,4], which is insoluble in traditional acid leaching process and makes the recovery of zinc and iron difficult.…”

Section: Introductionmentioning

confidence: 99%

Recovery of iron from zinc leaching residue by selective reduction roasting with carbon

Peng

Chai

et al. 2012

Journal of Hazardous Materials

100

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“…Later increases sharply from 400 to about 800 °C, it can be concluded that the oxidation reaction of zinc sulfide proceed gradually according to the temperature condition of zinc sulfide oxidation reaction [19,20], and there is a main phase transformation in this temperature range as well, Figure 2 also can prove that there are some reactions from 400 to about 800 °C. Lastly drop sharply to an almost stable value, which means main reaction have finished by compared with the dielectric properties of zinc oxide we have measured.…”

Section: Dielectric Properties Of Zinc Sulfide Concentratementioning

confidence: 77%

Dielectric properties of zinc sulfide concentrate during the roasting at microwave frequencies

Guang-jun¹,

Li²,

Yang³

et al. 2017

Preprint

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Abstract:Microwave technology has a potential application in the extraction of zinc from sulphide ores, knowledge of the dielectric properties of these ores plays a major role in the microwave design and simulation for any process. The dielectric properties of zinc sulfide concentrate for two different apparent densities-1.54 and 1.63 g/cm 3 -have been measured by using the resonance cavity perturbation technique at 915 and 2450 MHz during the roasting process for the temperature ranging from room temperature to 850 °C. The variations of dielectric constant, the dielectric loss factor, the dielectric loss tangent and the penetration depth with the temperature, frequency and apparent density have been investigated numerically. The results indicate that the dielectric constant increases as the temperature increases and temperature has a pivotal effect on the dielectric constant, while the dielectric loss factor has a complicated change and all of the temperature, frequency and apparent density have a significant impact to dielectric loss factor. Zinc sulfide concentrate is high loss material from 450 to 800 °C on the basis of theoretical analyses of dielectric loss tangent and penetration depth, its ability of absorbing microwave energy would be enhanced by increasing the apparent density as well. The experimental results also have proved that zinc sulfide concentrate is easy to be heated by microwave energy from 450 to 800 °C. In addition, the experimental date of dielectric constant and loss factor can be fitted perfectly by Boltzmann model and Gauss model, respectively.

show abstract

Zinc recovery from franklinite by sulphation roasting

Cited by 53 publications

References 15 publications

Dielectric Properties of Zinc Sulfide Concentrate during the Roasting at Microwave Frequencies

Dielectric Properties of Zinc Sulfide Concentrate during the Roasting at Microwave Frequencies

Recovery of iron from zinc leaching residue by selective reduction roasting with carbon

Dielectric properties of zinc sulfide concentrate during the roasting at microwave frequencies

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