Study of electric-arc furnace dust (EAFD) in fly ash and rice husk ash-based geopolymers

Arnold, Morgana Cristina; Vargas, Alexandre Silva de; Bianchini, Liane

doi:10.1016/j.apt.2017.05.007

Cited by 34 publications

(21 citation statements)

References 50 publications

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“…So far various types of slags, rich in Ca or Fe, produced from various metal and steel production industries have been successfully alkali activated. Alkali activation involves the use of raw slags or their mixtures with other waste types to regulate their content of aluminosilicates and enable the formation of strong bonds [15][16][17][18]. It is mentioned that the produced structures may also exhibit other beneficial properties, including the sorption of contaminants from solutions and immobilization of hazardous ions [19,20].…”

Section: Introductionmentioning

confidence: 99%

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

et al. 2019

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This study aims to model grinding of a Polish ferronickel slag and evaluate the particle size distributions (PSDs) of the products obtained after different grinding times. Then, selected products were alkali activated in order to investigate the effect of particle size on the compressive strength of the produced alkali activated materials (AAMs). Other parameters affecting alkali activation, i.e., temperature, curing, and ageing time were also examined. Among the different mathematical models used to simulate the particle size distribution, Rosin-Rammler (RR) was found to be the most suitable. When piecewise regression analysis was applied to experimental data it was found that the particle size distribution of the slag products exhibits multifractal character. In addition, grinding of slag exhibits non-first-order behavior and the reduction rate of each size is time dependent. The grinding rate and consequently the grinding efficiency increases when the particle size increases, but drops sharply near zero after prolonged grinding periods. Regarding alkali activation, it is deduced that among the parameters studied, particle size (and the respective specific surface area) of the raw slag product and curing temperature have the most noticeable impact on the compressive strength of the produced AAMs.

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Section: Introductionmentioning

confidence: 99%

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

et al. 2019

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“…Raw materials rich in silica and alumina, including bricks, ceramic waste, metakaolin, fly ash, kaolin and slag can be used for the production of IPs [2,12]. Apart from the construction sector, the produced IPs may be used for the immobilization of hazardous elements or as adsorbents in various industrial processes [13][14][15][16][17]. The properties of the produced IPs may be determined by the use of various analytical techniques [3,18].…”

Section: Introductionmentioning

confidence: 99%

“…Alkaline activation has been recently attracted attention as a promising option for the management of CDW and the production of IPs with beneficial mechanical, thermal and physico-chemical properties [19,20]. Apart from the use of single CDW constituents, other waste streams, such as slags, leaching residues and sediments may be used in order to obtain optimum raw material mixtures and IPs with tailored properties [15,[20][21][22]. The degree of reactivity of each waste stream differs and depends on the type and content of the contained aluminosilicates.…”

Section: Introductionmentioning

confidence: 99%

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

et al. 2019

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This paper explores the alkali activation potential of brick wastes and metallurgical slags. Inorganic polymers (IPs) were produced using an alkaline medium consisting of sodium hydroxide and sodium silicate solutions and the optimum synthesis conditions were determined. In this context, the variable parameters, such as solid to liquid (S/L) ratio, curing temperature (60, 80 and 90 °C) and ageing time (7 and 28 days) on the compressive strength and the morphology of the produced IPs were investigated. Specimens produced under the optimum synthesis conditions were subjected to high temperature firing and immersed in distilled water and acidic solutions for various periods of time, in order to assess their durability and structural integrity. The results showed that the IPs produced using a mix ratio of 50 wt % metallurgical slag and 50 wt % brick wastes, cured at 90 °C and aged for 7 days obtained the highest compressive strength (48.9 MPa). X-ray fluorescence analysis (XRF), particle size analysis, Fourier transform infrared spectroscopy (FTIR), mineralogical analysis (XRD), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis also confirmed the optimum microstructural characteristics and the chemical reactions that took place during synthesis. The overall results of this study indicate that the co-valorization of different waste streams, which are produced in large quantities and cause environmental problems if not properly managed, is a viable alternative for the production of binders or secondary construction materials with higher added value.

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“…The amount of EAFDS generated in EAF route is estimated to be 15-20 kg per ton of steel produced (Arnold et al 2017;Ferreira et al 2018;Silva et al 2019). The composition of EAFDS differs based on the type of steel produced with a considerable variation of compositions.…”

Section: Introductionmentioning

confidence: 99%

Removal of Al, Ba and Mg from industrial wastewater using EAFDS and lime

et al. 2020

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Wastewater treatment and removal of hazardous metals is imperative for the well-being of living things and the environment. Different methods for the removal of hazardous metals have been proposed and practiced with varying success. In this study, dust slag generated by electric arc furnace is utilized for the removal of aluminium, barium and magnesium from industrial effluent. Slag which is a waste generated during the process of steel production is alkaline by nature. It was able to raise the pH of the acidic effluent to 8.7 removing most of the metals and reducing the amount of commercial alkali required to raise the pH to the target pH of 12.5. EAFDS in conjunction with lime removed 98% of Al, 95.8% of Ba and 99.7% of Mg. The method was simple, efficient and cost-effective since it utilizes a material considered hazardous waste for the treatment.

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Study of electric-arc furnace dust (EAFD) in fly ash and rice husk ash-based geopolymers

Cited by 34 publications

References 50 publications

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials

Properties of Inorganic Polymers Produced from Brick Waste and Metallurgical Slag

Removal of Al, Ba and Mg from industrial wastewater using EAFDS and lime

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