Selective separation of zinc and iron/carbon from blast furnace dust via a hydrometallurgical cooperative leaching method

Luo, Xingguo; Wang, Chenyu; Shi, Xianguo; Li, Xingbin; Wei, Chang; Li, Minting; Deng, Zhigan

doi:10.1016/j.wasman.2021.12.007

Cited by 19 publications

(5 citation statements)

References 20 publications

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“…Recent results showed that ultrasonic leaching of zinc from steel industry dust and sludge with the help of choline chloride-urea ionic liquid has special solubilization ability for ZnO, by which the leaching efect of Zn can reach more than 98% (Niu et al, 2022). Zinc and iron/carbon can be also effectively leached from blast furnace dust via a hydrometallurgical cooperative leaching method (using NaCl-HCl-H O system) by which up to 93.2% of zinc can be extracted 2 (Luo et al, 2022). In separate pyrometallurgical technologies, wet process, physical process, or their combinations, such as the technical solution of pyroenrichment-wet-separation-multiprocess coupling extraction, it is possible not only to regenerate iron and iron oxides, but even to achieve complete recycling of dust and sludge from steel industry (Wang et al, 2021;Li et al, 2022).…”

Section: Resultsmentioning

confidence: 99%

Environmental-friendly view on steel industry dust and sludge as secondary raw materials-analysis and evaluation of the characteristic properties

Šoltész Matulová,

Fecková Škrabuľáková,

Ivanová

2023

JEB

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Aim: To analyze the characteristic properties of dust and sludge from steel converters and to evaluate the perspectives of their reuse. Methodology: In order to evaluate the properties of samples, standard research designs were followed. Different methods such as titration, atomic absorption spectroscopy, inductively coupled plasma, optical emission spectrometry and combustion/fusion analyses were followed. Results: In a series of experiments, the percentage Fe and Fe oxides, calcium and zinc oxides as well as the amount of quartz were determined. A large amount of precious metals and materials in the study samples were recovered by suitable techniques. Instead of polluting the environment, the secondary products of steelmaking process can be reused. Interpretation: The work is important from the environmental point as it brings a complex view on the characteristic properties of steel industry dusts and sludges in the shape of physico-chemical and morphological properties, granulometric composition, and mineralogical analysis. This knowledge might bring better understanding of recycling perspectives of these items not only in the case of their pyrometallurgical processing. Key words: Dust, Recycling, Secondary raw materials, Sludge, Steel industry

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Section: Resultsmentioning

confidence: 99%

Environmental-friendly view on steel industry dust and sludge as secondary raw materials-analysis and evaluation of the characteristic properties

Šoltész Matulová,

Fecková Škrabuľáková,

Ivanová

2023

JEB

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“…Elemental analysis robustly confirmed the presence of these elements in the composition of BFDW powder, in addition to other minor impurities, e.g., Al, Si, P, Cl, and Ti. Such unique elemental characteristics of BFDW can be ascribed to the composition of the precursor raw materials [47,48], e.g., dolomite [2], quartz [49], sinter constituents [50], and pellets [51]. The structural analysis of BFDW, depicted in Figure 1b, discloses that the waste is primarily composed of α-Fe 2 O 3 (89.9%), CaO (7.7%), ZnO (1.5%), and Zn(OH) 2 (0.9%).…”

Section: Characterization Of Bfdw Powdermentioning

confidence: 99%

Associating Physical and Photocatalytic Properties of Recyclable and Reusable Blast Furnace Dust Waste

Chaves,

Lima,

Monteiro

et al. 2024

Materials

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Blast furnace dust waste (BFDW) proved efficient as a photocatalyst for the decolorization of methylene blue (MB) dye in water. Structural analysis unequivocally identified α-Fe2O3 as the predominant phase, constituting approximately 92%, with a porous surface showcasing unique 10–30 nm agglomerated nanoparticles. Chemical and thermal analyses indicated surface-bound water and carbonate molecules, with the main phase’s thermal stability up to 900 °C. Electrical conductivity analysis revealed charge transfer resistance values of 616.4 Ω and electrode resistance of 47.8 Ω. The Mott-Schottky analysis identified α-Fe2O3 as an n-type semiconductor with a flat band potential of 0.181 V vs. Ag/AgCl and a donor density of 1.45 × 1015 cm−3. The 2.2 eV optical bandgap and luminescence stem from α-Fe2O3 and weak ferromagnetism arises from structural defects and surface effects. With a 74% photocatalytic efficiency, stable through three photodegradation cycles, BFDW outperforms comparable waste materials in MB degradation mediated by visible light. The elemental trapping experiment exposed hydroxyl radicals (OH•) and superoxide anions (O2−•) as the primary species in the photodegradation process. Consequently, iron oxide-based BFDW emerges as an environmentally friendly alternative for wastewater treatment, underscoring the pivotal role of its unique physical properties in the photocatalytic process.

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“…Blast-furnace smelting limits the zinc content of the charge to a certain extent; therefore, the zinc content of the sintered or pellet-treated zinc-containing dust must not be too high [3,21]. One of the common methods of treating secondary resources is acid leaching [22][23][24]. In the acid-leaching process, the soluble zinc contained in the electric-furnace dust is dissolved in acid and incorporated into the leaching solution, after which the leaching solution is purified and then treated by electrowinning to obtain metallic zinc ingots.…”

Section: Introductionmentioning

confidence: 99%

Mineral Phase Reconstruction and Separation Behavior of Zinc and Iron from Zinc-Containing Dust

Xie

Guo

et al. 2023

Materials

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Zinc-containing dust can be found in ironmaking and steelmaking, and it is an important secondary resource of zinc. Zinc-containing dust from an electric furnace was used as a raw material to study the phase transformation behavior of the dust using a calcification roasting process and the zinc–iron separation behavior by using ammonia leaching. The zinc-bearing dust was mixed with CaO and roasted to transform the zinc ferrite into zinc oxide. The results showed that increasing the calcium oxide to dust ratio could promote the conversion of zinc ferrite to zinc oxide. When the calcium oxide ratio reached 60%, the peak of zinc ferrite in the calcined-roasted product in the zinc-containing dust basically disappeared. As the temperature increased, the zinc oxide grains increased but were still smaller than 10 μm. The calcined-roasted product was crushed and ground, and the zinc was leached by ammonia. A zinc–iron recovery rate of 86.12% was achieved by the ammonia leaching. The leachate could be used for zinc extraction by electrolysis. The leaching residue was mainly calcium ferrate, which could be used in sintering production. The proposed process may achieve on-site recovery of zinc-containing dust in steel-making plants.

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Selective separation of zinc and iron/carbon from blast furnace dust via a hydrometallurgical cooperative leaching method

Cited by 19 publications

References 20 publications

Environmental-friendly view on steel industry dust and sludge as secondary raw materials-analysis and evaluation of the characteristic properties

Environmental-friendly view on steel industry dust and sludge as secondary raw materials-analysis and evaluation of the characteristic properties

Associating Physical and Photocatalytic Properties of Recyclable and Reusable Blast Furnace Dust Waste

Mineral Phase Reconstruction and Separation Behavior of Zinc and Iron from Zinc-Containing Dust

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