Investigation of possibility for stabilization and valorization of electric ARC furnace dust and glass from electronic waste

This paper presents investigation of possibility for electric arc furnace dust (EAFD) and electronic waste (e-waste) valorization trough stabilization process, in order to achieve concurrent management of these two serious ecological problems. EAFD is an ineviTab. waste material coming from the electric arc furnace steel production process, classified as a hazardous waste. Furthermore, it is well known that residual materials generated in the ewaste recycling process, like LCD (Liquid crystal displays) waste glass, are not suiTab. for landfill or incineration. In this study, these two materials were used for investigation of possibility for their valorization in ceramic industry. Thus, an innovative synergy of waste streams from metallurgical and e-waste recycling industry is presented. Investigation included a complex characterization of raw materials and their mixtures, using chemical methods, optical microscopy, scanning electron microscopy, as well as methods for determining the physical and mechanical properties. Based on these results, it was found that material suiTab. for use in ceramics industry as a partial substituent of quartzite and fluxing components can be produced. Besides solving the environmental problem related to EAFD and LCD disposal, by replacement of raw materials certain economic effects can be achieved.

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Characterisation of electric arc furnace dust generated during plain carbon steel production

Ironmaking & Steelmaking ◽

10.1179/030192307x232936 ◽

2008 ◽

Vol 35 (4) ◽

pp. 315-320 ◽

Cited By ~ 21

Author(s):

M. C. da Silva ◽

A. M. Bernardes ◽

C. P. Bergmann ◽

J. A. S. Tenório ◽

D. C. R. Espinosa

Keyword(s):

Carbon Steel ◽

Steel Production ◽

Electric Arc Furnace ◽

Plain Carbon Steel ◽

Electric Arc ◽

Arc Furnace ◽

Electric Arc Furnace Dust

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Investigation on the Chemical and Thermal Behavior of Recycling Agglomerates from EAF by-Products

Applied Sciences ◽

10.3390/app10228309 ◽

2020 ◽

Vol 10 (22) ◽

pp. 8309

Author(s):

Thomas Willms ◽

Thomas Echterhof ◽

Stefan Steinlechner ◽

Matti Aula ◽

Ahmed Abdelrahim ◽

...

Keyword(s):

Thermal Behavior ◽

Raw Materials ◽

Central Element ◽

Steel Production ◽

Electric Arc Furnace ◽

Electric Arc ◽

Arc Furnace ◽

Electric Steel ◽

Crude Steel ◽

By Products

In addition to the blast furnace converter route, electric steel production in the electric arc furnace (EAF) is one of the two main production routes for crude steel. In 2019, the global share of crude steel produced via the electric steel route was 28%, which in numbers is 517 million metric tons of crude steel. The production and processing of steel leads to the output of a variety of by-products, such as dusts, fines, sludges and scales. At the moment, 10–67% of these by-products are landfilled and not recycled. These by-products contain metal oxides and minerals including iron oxide, zinc oxide, magnesia or alumina. Apart from the wasted valuable materials, the restriction of landfill space and stricter environmental laws are additional motivations to avoid landfill. The aim of the Fines2EAF project, funded by the European Research Fund for Coal and Steel, is to develop a low-cost and flexible solution for the recycling of fines, dusts, slags and scales from electric steel production. During this project, an easy, on-site solution for the agglomeration of fine by-products from steel production has to be developed from lab scale to pilot production for industrial tests in steel plants. The solution is based on the stamp press as the central element of the agglomeration process. The stamp press provides the benefit of being easily adapted to different raw materials and different pressing parameters, such as pressing-force and -speed, or mold geometry. Further benefits are that the stamp press process requires less binding material than the pelletizing process, and that no drying process is required as is the case with the pelletizing process. Before advancing the agglomeration of by-products via stamp press to an industrial scale, different material recipes are produced in lab-scale experiments and the finished agglomerates are tested for their use as secondary raw materials in the EAF. Therefore, the tests focus on the chemical and thermal behavior of the agglomerates. Chemical behavior, volatilization and reduction behavior of the agglomerates were investigated by differential thermogravimetric analysis combined with mass spectroscopy (TGA-MS). In addition, two melts with different agglomerates are carried out in a technical-scale electric arc furnace to increase the sample size.

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Determination of the Chemical, Physical and Mechanical Characteristics of Electric Arc Furnace Slags and Environmental Evaluation of the Process for Their Utilization as an Aggregate in Bituminous Mixtures

Materials ◽

10.3390/ma14040782 ◽

2021 ◽

Vol 14 (4) ◽

pp. 782 ◽

Cited By ~ 1

Author(s):

Juan María Terrones-Saeta ◽

Jorge Suárez-Macías ◽

Evaristo Rafael Moreno-López ◽

Francisco Antonio Corpas-Iglesias

Keyword(s):

Raw Materials ◽

Physical And Mechanical Properties ◽

Road Construction ◽

Electric Arc Furnace ◽

Electric Arc ◽

Arc Furnace ◽

Environmental Evaluation ◽

Bituminous Mixtures ◽

Electric Arc Furnace Slag

Road construction is an activity that demands a significant amount of aggregates for bituminous mixtures. In addition, these aggregates must be of a suitable quality for use, even more so on high traffic roads. In response to this problem, and in order to avoid the extraction of new raw materials, research is being carried out using industrial waste as a substitute for conventional aggregates. In this way, the extraction of raw materials is reduced and landfilling of waste is avoided. However, these wastes must have certain properties and environmental advantages over natural aggregates. Otherwise, the use of waste would not be environmentally beneficial but would be more damaging to the environment. For this reason, this research evaluates the viability of using electric arc furnace slag as aggregates for bituminous mixtures, the main objectives being the determination of the characteristics of the by-product, the particularities and the critical points to be taken into account for its subsequent use in mixtures. At the same time, the environmental advantages of treating this waste to obtain a usable aggregate are evaluated in comparison with the processing of a natural aggregate. The results showed that electric arc furnace slags have a suitable chemical composition and excellent physical and mechanical properties for use in bituminous mixtures, even on high traffic roads. At the same time, it was determined that their use produces a considerable reduction in environmental afflictions. Therefore, it could be affirmed that the use of electric arc furnace slags in bituminous mixtures is recommendable as a way to develop more sustainable materials for construction.

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