Hydrometallurgical recovery of zinc from industrial hot dipping top ash

Rudnik, Ewa

doi:10.1016/s1003-6326(20)65375-4

Cited by 9 publications

(2 citation statements)

References 37 publications

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“…Reduction time affects not only the reduction rate of Zn in carbon-containing pellets but also the smelting efficiency and energy consumption [ 12 , 15 , 23 , 24 , 25 , 26 , 27 ]. The relation of the ZnO reduction rate of zinc ash pellets and the different reduction times (30 min, 40 min, 50 min, and 60 min) are investigated, as shown in Figure 7 .…”

Section: Resultsmentioning

confidence: 99%

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

Gao

Wang

et al. 2022

Materials

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Zinc ash is a by-product of the hot-dip galvanizing process and the electrolytic zinc process, which is classified as a hazardous waste consisting predominately of zinc oxide that could be recovered as the useful main resource for ZnO preparation. In this work, in order to reduce the energy consumption of the direct reduction process and improve the resource-recovery rate. A new technology for zinc oxide production, by a carbothermal reduction of zinc ash, is proposed. This process includes two steps: high-temperature roasting of zinc ash for dechlorination and a carbothermal reduction of dechlorination ash. Zn in zinc ash is mainly presented in the form of zinc oxide (ZnO), basic zinc chloride (Zn5(OH)8Cl2H2O), and metallic zinc (Zn). Basic zinc chloride can be roasted and decomposed to reduce the chlorine content in zinc ash. The results of a chloride ion removal test show that the optimal roasting temperature is 1000 °C, with a holding time of 60 min. Under the modified conditions, the chloride content in the roasted zinc ash is reduced to 0.021 wt.%, and the dechlorination rate is more than 99.5%, which can meet the requirements of zinc oxide production. The best process conditions for zinc oxide production by carbothermic reduction are as follows: reduction temperature of 1250 °C, reduction time of 60 min, and reduction agent addition of 22 wt.%. Under the best reduction process, the purity of zinc oxide product is 99.5%, and the recovery of zinc is more than 99.25%. Needle-like zinc oxide obtained by carbothermic reduction has high purity and can replace zinc oxide produced by an indirect process.

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Section: Resultsmentioning

confidence: 99%

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

Gao

Wang

et al. 2022

Materials

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“…Hot-dip galvanizing is one of the more effective and economical methods to treat steel against atmospheric corrosion, and it has been widely used [ 1 , 2 , 3 , 4 ]. Nevertheless, the severe corrosion in continuous galvanizing line (CGL) processing is a challenge for the long-term submersed hardware [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Corrosion Resistance of Fe-B-W-Mn-Al Alloy in Liquid Zinc

Luo

Liu²,

Cui

et al. 2022

Materials

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The microstructure, interfacial characteristics, and corrosion resistance of Fe-W-Mn-Al-B alloys in molten zinc at 520 °C have been investigated using scanning electron microscopy (SEM), X-ray diffractometry (XRD), and electron probe micro-analysis (EPMA). The experimental results indicate that the Fe-B alloy with 11 wt.% W, 7 wt.% Mn, and 4 wt.% Al addition displays a lamellar eutectic microstructure and excellent corrosion resistance to molten zinc. The toughness of M2B-type borides in the hyper-eutectic Fe-4.2B-11W-7Mn-4Al alloy can be more than doubled, reaching 10.5 MPa·m1/2, by adding Mn and Al. The corrosion layer of the Fe-3.5B-11W-7Mn-4Al alloy immersed in molten zinc at 520 °C comprises Fe3AlZnx, δ-FeZn10, ζ-FeZn13, and η-Zn. The lamellar borides provide the mechanical protection for α-(Fe, Mn, Al), and the thermal stability of borides improves as the fracture toughness of the borides increases, which jointly contribute to the improvement of the corrosion resistance to the molten zinc.

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Hydrometallurgical Recovery of Zinc from By-Products and Waste Materials of Hot-Dip Galvanizing Process

Rudnik

2023

The Minerals, Metals &Amp; Materials Series

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Hydrometallurgical recovery of zinc from industrial hot dipping top ash

Cited by 9 publications

References 37 publications

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

A New Process of Direct Zinc Oxide Production by Carbothermal Reduction of Zinc Ash

The Microstructure and Corrosion Resistance of Fe-B-W-Mn-Al Alloy in Liquid Zinc

Hydrometallurgical Recovery of Zinc from By-Products and Waste Materials of Hot-Dip Galvanizing Process

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