Recycling of electric arc furnace (EAF) dust for use in steel making process (original) (raw)
Related papers
Journal of Cleaner Production, 2018
Currently, more than half of the electric arc furnace (EAF) dust produced worldwide is still sent to landfill. This dust contains approximately 7.0% of the world Zn production. The other half of the EAF dust is processed pyrometallurgically or hydrometallurgically to recover Zn. The processing costs for EAF dust strongly depend on the Zn concentration. Therefore, several steel mills apply in-plant enrichment of Zn by recycling part of the dust back into the furnace to reduce the specific processing cost for the EAF dust and at the same time decrease the amount of dust that has to be discharged. Separation of EAF dust into size fractions by air classification showed a distinct dependence of the Zn concentration on the particle size with an enrichment of Zn in the fine size fractions and depletion in the coarse fractions. Therefore, in in-plant dust recycling, air classification of the dust could be used to reduce the amount of recycled Zn and dust but still reaching the same Zn concentration in the discharged dust. This would reduce the energy demand for Zn volatilization in the furnace and the required capacity of the dust recycling system.
Characterization of steel mill electric-arc furnace dust
Journal of Hazardous Materials, 2004
In order to make a complete characterization of electric-arc furnace (EAF) dust, as hazardous industrial waste, and to solve its permanent disposal and/or recovery, bearing in mind both the volumes formed in the Croatian steel industry and experiences of developed industrial countries, a study of its properties was undertaken.
High-Performance Method of Recovery of Metals from EAF Dust-Processing without Solid Waste
Materials, 2021
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.
Processing and Recycling Experiments of Dust from Electric Arc Furnace
Advanced Materials Research, 2011
The processing and recycling experiments of dust from Electric Arc Furnace (EAF) in industrial conditions aimed at highlighting the minimizing possibility of this waste by transforming it into a by-product that can represent either a secondary raw material for steel making in EAF or to recover iron, zinc and lead (the Waltz process). Electric-arc furnace dust (EAFD) is a by-product of steel production and recycling. This finegrained material contains high amounts of zinc and iron as well as significant amounts of potentially toxic elements such as lead, cadmium and chromium. Therefore, the treatment and stabilization of this industrial residue is necessary. Leaching test is a method of evaluating the impact of waste that is stored (soil, water table).
The Potential Usage Of Steelmaking By-Products: Electric Arc Furnace Dust
Jurnal Teknologi, 1997
During the steel manufacturing processes, by-products such as electric arc furnace (EAF) dust. rich in metallic oxides. are generated . In Malaysia. EAF dust is presently dumped or landfilled. llowcver. a~ we forge ahead to achieve Malaysia's Vision 2020 to be a fully industrialised nation, we should not lose sight of the var ious regulations to protect the environ ment.
Chemical, physical, structural and morphological characterization of the electric arc furnace dust
Journal of Hazardous Materials, 2006
Electric arc furnace dust (EAFD) is a hazardous industrial waste generated in the collection of particulate material during steelmaking process via electric arc furnace. Important elements to the industry such as, Fe and Zn are the main ones in EAFD. Due to their presence, it becomes very important to know how these elements are combined before studying new technologies for its processing. The aim of this work was to carry out a chemical, physical, structural and morphological characterization of the EAFD. The investigation was carried out by using granulometry analysis, chemical analysis, scanning electron microscopy (SEM), energy dispersive spectroscopy via SEM (EDS), X-ray mapping analysis via SEM, X-ray diffraction (XRD) and Mössbauer spectroscopy. By XRD the following phases were detected: ZnFe 2 O 4 , Fe 3 O 4 , MgFe 2 O 4 , FeCr 2 O 4 , Ca 0.15 Fe 2.85 O 4 , MgO, Mn 3 O 4 , SiO 2 and ZnO. On the other hand, the phases detected by Mössbauer spectroscopy were: ZnFe 2 O 4 , Fe 3 O 4 , Ca 0.15 Fe 2.85 O 4 and FeCr 2 O 4 . Magnesium ferrite (MgFe 2 O 4 ), observed in the XRD pattern as overlapped peaks, was not identified in the Mössbauer spectroscopy analysis.
Hydrometallurgical processing of carbon steel EAF dust
Journal of Hazardous Materials, 2006
In this study, the hydrometallurgical processing of electric arc furnace (EAF) steelmaking dust is investigated on a laboratory scale under normal temperature and pressure conditions. The behaviour of zinc and iron under the influence of sulphuric acid as the leaching agent is discussed. The dependence between the temperature and acid concentration is investigated. The main aim is the transfer of zinc into the solution while iron ought to remain as a solid residue.
Recycling of an electric arc furnace flue dust to obtain high grade ZnO
Journal of Hazardous Materials, 2007
The production of steel in electric arc furnace (EAF) generates a by-product called EAF dusts. These steelmaking flue dusts are classified in most industrialized countries as hazardous residues because the heavy metals contained in them, tend to leach under slightly acidic rainfall conditions. However, and at the same time they contain zinc species which can be used as a source to obtain valuable by-products. The present investigation shows results on the processing of an EAF flue dust using ammonium carbonate solutions. Once zinc is dissolved:
Characterization study of electric arc furnace dust phases
Materials Research-ibero-american Journal of Materials, 2006
Electric arc furnace dust (EAFD) is a solid waste generated in the collection of particulate material during steelmaking process in electric arc furnace. The aim of this work is to carry out a chemical and structural characterization of two EAFD samples with different Zn contents. Optical emission spectroscopy via inductively coupled plasma (ICP), X ray diffractometry (XRD) and Mössbauer spectroscopy analysis were carried out in such EAFD samples. From XRD measurements, the samples exhibits the following phases: ZnFe2O4, Fe3O4, MgFe2O4, FeCr2O4, Ca0.15Fe2.85O4, MgO, Mn3O4, SiO2 and ZnO. The phases detected by Mössbauer spectroscopy were: ZnFe2O4, Fe3O4, Ca0.15Fe2.85O4 and FeCr2O4. Magnesium ferrite (MgFe2O4), observed in the XRD patterns as overlapped peaks, was not identified in the Mössbauer spectroscopy analysis.
Waste management (New York, N.Y.), 2018
Dust emission is one of the main environmental pollution impacts associated with steelmaking. In this sense, electrostatic precipitators (ESP) are regarded as the best available technique for treating this type of emission, thus generating two differentiated fractions: coarse and fine. Thorough chemical and structural characterization of both materials was carried out to recycle these byproducts in either the sintering process or other steps of pig iron production. Both types of dusts are crystalline heterogeneous materials mainly composed of sepiolite (MgSi(OH)·12HO), hematite (FeO) and calcite (CaCO), the coarse fraction containing low amounts of Na (0.38 ± 0.04%) and K (0.17 ± 0.02%), which adversely affect blast furnace operation. Hence, the coarse fraction is suitable for recycling, whereas the fine one presents higher concentrations of these alkali elements. Besides, textural characterization revealed that dust particulates are essentially macroporous materials, with specific ...