Immobilization of iron rich steel industry waste and products characterization

Lorenzi, Andrea; Rastelli, Davide; Biavati, Alberto; Poncini, Michele; Alfieri, Ilaria; Albertini, F.; Gombia, E.; Romaniello, Lea; Montenero, A.

doi:10.1016/j.jece.2014.11.024

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…Apart from the tabulated ones, materials such as sinter dust/sludge, coal tar sludge, Kiln dust, fly ash, ESP dust, refractory waste are also being generated and utilized. 14,15) The nature and composition of the tabulated by-products depends on their source of generation. Day in and day out, researches throughout the globe are on board in generating and implementing novel ideas, to optimize the utilization of generated by-products, benefiting the iron and steel makers.…”

Section: Valuable By-products Of a Steel Industrymentioning

confidence: 99%

Iron Powders from Steel Industry by-products

Sista

Dwarapudi

2018

ISIJ Int.

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Global iron and steel making industries generate immense number of by-products, among which few are already being utilized for the generation of high value products, while few are still struggling to gather a good market space. Waste utilization is the major concern for every industrial maker. In this context, iron powder which holds immense market in applications like powder metallurgy (PM) parts, welding electrodes, advanced oxidative agents for water treatment, food fortifying agents, metal injection moulding, catalysts, fuels etc., can now be a novel outcome from steel industry by-products. Iron powder can be manufactured by various techniques like reduction, atomization, electrolysis, etc., resulting in fine particles of various morphologies ranging from spherical to irregular shapes and low to high purity. The application of these iron powders is depended on the process, quality and purity of the desired product.

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Section: Valuable By-products Of a Steel Industrymentioning

confidence: 99%

Iron Powders from Steel Industry by-products

Sista

Dwarapudi

2018

ISIJ Int.

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“…This was confirmed by Francis, who studied the annealing of a glass, from the melting of furnace slag and flue dust, for 2 h at 800 to 1000 °C, and found that saturation magnetization decreases as a consequence of the transformation of the magnetic species (magnetite or γ‐maghemite) into non‐magnetic phases. The magnetic susceptibility is also maximized for smaller particle sizes: as an example, Lorenzi et al , who used dust from an electrostatic precipitator as iron source (combined with glass cullet), obtained a ferromagnetic material after direct casting of the melt and explained the increase of saturation magnetization in terms of higher content of ferrimagnetic species (magnetite/maghemite) and a peculiar size distribution of the particles (nanometric or micrometric crystals) within the samples.…”

Section: Structural and Functional Propertiesmentioning

confidence: 99%

“…Lorenzi et al recently reported that iron‐rich glasses may lead to glass‐ceramics with low electrical resistivity, in the order of 20 Ω m, attributed to the fact that iron oxide nanoclusters, when their density exceeds a certain threshold value, can give rise to percolation effects that can strongly reduce the resistivity of the material, up to values that make it suitable for applications in antistatic surfaces.…”

Section: Structural and Functional Propertiesmentioning

confidence: 99%

Recycling of inorganic waste in monolithic and cellular glass‐based materials for structural and functional applications

Rincón

Marangoni

Çetin

et al. 2016

J of Chemical Tech & Biotech

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The stabilization of inorganic waste of various nature and origin, in glasses, has been a key strategy for environmental protection for the last decades. When properly formulated, glasses may retain many inorganic contaminants permanently, but it must be acknowledged that some criticism remains, mainly concerning costs and energy use. As a consequence, the sustainability of vitrification largely relies on the conversion of waste glasses into new, usable and marketable glass‐based materials, in the form of monolithic and cellular glass‐ceramics. The effective conversion in turn depends on the simultaneous control of both starting materials and manufacturing processes. While silica‐rich waste favours the obtainment of glass, iron‐rich wastes affect the functionalities, influencing the porosity in cellular glass‐based materials as well as catalytic, magnetic, optical and electrical properties. Engineered formulations may lead to important reductions of processing times and temperatures, in the transformation of waste‐derived glasses into glass‐ceramics, or even bring interesting shortcuts. Direct sintering of wastes, combined with recycled glasses, as an example, has been proven as a valid low‐cost alternative for glass‐ceramic manufacturing, for wastes with limited hazardousness. The present paper is aimed at providing an up‐to‐date overview of the correlation between formulations, manufacturing technologies and properties of most recent waste‐derived, glass‐based materials. © 2016 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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“…For the recycling, the steel waste should be previously treated in different ways, such as grinding, pressing, bathing, vitrifying, annealing, and other related procedures under various conditions of pressure, atmosphere and temperature [1,6,7]. For example, annealing promotes the oxidation of iron such as hematite (α-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) and then the iron components can be separated magnetically.…”

Section: Introductionmentioning

confidence: 99%

“…Carlini et al have observed that by regulating the number of iron ions in the body and limiting the crystallization process, it is possible to obtain materials with conductivity less than 1000 Ω [3]. Also, it has been reported that the formation of nanoor micro-scale crystals gives iron oxide certain outstanding properties, such as electrical conductivity and ferromagnetism [6]. Moreover, the characteristics of pigments obtained from recycled iron oxides are greatly affected by the grinding, milling and heat treatment processes and also by hematite content [2].…”

Section: Introductionmentioning

confidence: 99%

Characterization of iron oxide waste scales obtained by rolling mill steel industry

et al. 2022

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Every year, the steelmaking industry produces millions of tons of slags resulting in pollution to the environment. Among the waste, secondary metals and scales rich in iron oxides are also thrown away. There is a need to treat the steel waste in a reasonably way to protect the environment and proposing new cheap technologies for producing advanced materials. In this study we report the morphological and structural characterization of waste scales generated during roll milling steel process at JSC “Arcelor Mittal Temirtau”. The raw slag and annealed at 1000 °C were measured by X-ray diffraction (XRD), scanning electron microscopy adapted with energy dispersive X-ray (SEM- EDX), magnetometry and Mössbauer Spectroscopy (MS). Fe and O were detected by EDX as main chemical elements and Si, S, Ca, Mg, C and Al as minimal elemental composition. XDR for the raw sample revealed α-Fe2O3 (hematite) and Fe3O4 (magnetite) as principal and secondary phase, respectively; whereas monophasic α-Fe2O3 is detected for the scales annealed at 1000 °C. Magnetometry measurements show the Verwey transition for the raw sample and the Morin transition for the annealed at 1000 °C; those are fingerprints for the presence of magnetite and hematite, respectively. MS measurements for the raw sample consist of 6 small peaks of absorption and a broad two-lines absorption peak in the central part. The doublets are associated to the hyperfine parameters belonging to wustite. Magnetite is related to the hyperfine parameters for two sextets in octahedral Fe2.5+ and tetrahedral Fe3+sites and a small sextet that resembles the Mössbauer parameters of α-Fe2O3. Only a well crystallized and weakly ferromagnetic sextet confirm the presence of α-Fe2O3 phase for the sample annealed at 1000 °C due to thermal oxidation.

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Immobilization of iron rich steel industry waste and products characterization

Cited by 6 publications

References 17 publications

Iron Powders from Steel Industry by-products

Iron Powders from Steel Industry by-products

Recycling of inorganic waste in monolithic and cellular glass‐based materials for structural and functional applications

Characterization of iron oxide waste scales obtained by rolling mill steel industry

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