State of the Art and Prospect for Recycling of Waelz Slag from Electric Arc Furnace Dust Processing

Grudinsky, Pavel; Zinoveev, Dmitry; Dyubanov, V. G.; Козлов, П. А.

doi:10.1134/s2075113319050071

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Having studied the results of the chemical analysis, they approximately coincide with previous studies of clinker’s chemical composition with predominance in iron composition [ 9 , 39 , 68 ].…”

Section: Resultssupporting

confidence: 72%

“…The results of the studies are shown in Figure 1 . From these results, it follows that the present waste in the form of clinker from welting in its composition contains elements such as zinc, lead, calcium, silicon, oxygen, iron, aluminum (which is also confirmed by the results of the chemical analysis carried out earlier) [ 9 , 39 , 68 ].…”

Section: Resultssupporting

confidence: 59%

“…Based on the results of determining the chemical composition of the waste under study given in Table 1 and previously obtained data by various scientists [ 9 , 68 , 69 , 70 ], chemical and phase interaction was simulated in the temperature range 1600–2200 K with a pressure of p = 0.1 MPa in the heterogeneous system under study ZnO∙SiO 2 -FeO∙Fe 2 O 3 -C, where the interaction of magnetite (FeO∙Fe 2 O 3 ) with zinc silicate (ZnO∙SiO 2 ) and carbon (C), which are contained in the clinker from Waelz process ( Figure 2 , Figure 3 and Figure 4 , and Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

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Modeling of Non-Ferrous Metallurgy Waste Disposal with the Production of Iron Silicides and Zinc Distillation

et al. 2022

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This paper presents studies on the possibility of utilization of technogenic waste from the metallurgical industry by the method of complex processing in order to reduce the anthropogenic load on the environment of the region with the example of the zinc silicate-magnetite-carbon system. The selected sample of clinker dump from welting was subjected to chemical and scanning electron microscopic analyses and thermodynamic modeling. Thermodynamic studies were carried out in the temperature range 1600–2200 K and pressure p = 0.1 MPa, modeling the process of electric melting of clinker from welting in an arc furnace using the software application Astra 4 developed at the Bauman Moscow State Technical University (Moscow, Russian Federation). As a result of the thermodynamic modeling, the optimal temperature range was established, which was 1800–1900 K. Thermodynamic studies established that it is possible to drive away zinc from the system under study by 99–100% in the entire temperature range under study. The maximum degree of silicon extraction (αSi) in the alloy is up to 69.44% at T = 1900 K, and the degree of iron extraction (αFe) in the alloy is up to 99.996%. In particular, it was determined and proved that clinker waste from welting can act as a secondary technogenic raw material when it is processed as a mono mixture to produce iron silicides with a silicon content of 18 to 28%.

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Section: Resultssupporting

confidence: 72%

Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

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Modeling of Non-Ferrous Metallurgy Waste Disposal with the Production of Iron Silicides and Zinc Distillation

et al. 2022

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“…The EAFD residue after the required treatment to remove hazardous heavy metals, i.e., Cr and Pb, was disposed of in a landfill [ 24 ]. Recently, there has been research on the use of EAFD residue in the production of ceramics, red clay bricks [ 25 , 26 , 27 , 28 ], building blocks, and cement [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

A New Hydrometallurgical Process for Metal Extraction from Electric Arc Furnace Dust Using Ionic Liquids

et al. 2022

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This research proposes a new hydrometallurgical method for Zn, In, and Ga extraction, along with Fe as a common impurity, from electric arc furnace dust (EAFD), using ionic liquids. EAFD is a metal-containing waste fraction generated in significant amounts during the process of steelmaking from scrap material in an electric arc furnace. With valuable metal recovery as the main goal, two ionic liquids, [Bmim+HSO4−] and [Bmim+Cl−], were studied in conjunction with three oxidants: Fe2(SO4)3, KMnO4, and H2O2. The results indicated that the best combination was [Bmim+HSO4−] with [Fe2(SO4)3]. An experimental series subsequently demonstrated that the combination of 30% v/v [Bmim+HSO4−], 1 g of [Fe2(SO4)3], S/L ratio = 1/20, a 240 min leaching time, and a temperature of 85 °C was optimal, resulting in maximum extractions of 92.7% Zn, 97.4% In, and 17.03% Ga. In addition, 80.2% of the impurity metal Fe was dissolved. The dissolution kinetics of these four elements over a temperature range of 55–85 °C was found to be diffusion controlled. The remaining phases present in the leached residue were low amounts of ZnO, Fe3O4, ZnFe2O4, and traces of Ca(OH)2 and MnO2, and additional sharp peaks indicative of PbSO4 and CaSO4 appeared within the XRD pattern. The intensity of the peaks related to ZnO and Fe3O4 were observed to have decreased considerably during leaching, whereas some of the refractory ZnFe2O4 phase remained. SEM-EDS analysis revealed that the initial EAFD morphology was composed of spherical-shaped fine-grained particle agglomerates, whereas the leached residue was dominated by calcium sulphate (Ca(SO4))-rich needle-shaped crystals. The results clearly demonstrate that [Bmim+HSO4−] is able to extract the target metals due to its acidic properties.

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“…Slag from the Waelz process is used mainly in construction and road building (as an aggregate); in the production of cement, concrete and bricks; as a basic material for sports fields and dykes; and as a drainage layer for landfill sites. However, it requires purification or binding of harmful components (lead, chromium, zinc, arsenic, and nickel), which, due to the nature of the slag phase (acidic or alkaline), may generate additional costs [16,17]. It should be added that the iron contained in the dust passes into the slag and is not recovered.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Method of Recovery of Metals from EAF Dust—Processing without Solid Waste

et al. 2021

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A highly effective method of the processing of steelmaking dust in an arc-resistant furnace has been presented. The aim of the research was to investigate the possibility of processing steelmaking dust in terms of waste minimization and selective recovery of valuable components. For this purpose, an electric arc resistance furnace was used. Granulated steelmaking dust with reducer (coal dust) was the input material. The products of the process are zinc oxide, iron alloy and slag, with properties meeting high ecological requirements. The technology does not generate solid waste. Zinc recovery is over 99% and iron recovery over 98%. The content of heavy metals (Zn + Pb + Cu) in glassy slag is below 0.2%, which ensures very low leachability.

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State of the Art and Prospect for Recycling of Waelz Slag from Electric Arc Furnace Dust Processing

Cited by 19 publications

References 17 publications

Modeling of Non-Ferrous Metallurgy Waste Disposal with the Production of Iron Silicides and Zinc Distillation

Modeling of Non-Ferrous Metallurgy Waste Disposal with the Production of Iron Silicides and Zinc Distillation

A New Hydrometallurgical Process for Metal Extraction from Electric Arc Furnace Dust Using Ionic Liquids

High-Performance Method of Recovery of Metals from EAF Dust—Processing without Solid Waste

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