scholarly journals Alkali Activation of Metallurgical Slags: Reactivity, Chemical Behavior, and Environmental Assessment

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 639
Author(s):  
Isabella Lancellotti ◽  
Federica Piccolo ◽  
Katja Traven ◽  
Mark Češnovar ◽  
Vilma Ducman ◽  
...  
Keyword(s):  
Building Materials ◽  
Steel Slag ◽  
Alkali Activation ◽  
Activation Process ◽  
Secondary Products ◽  
Stainless Steel Slag ◽  
Promising Alternative ◽  
Temperature Separation ◽  
Aqueous Environments ◽  
Metallurgical Slags

Alkali-activated materials (AAMs) represent a promising alternative to conventional building materials and ceramics. Being produced in large amounts as aluminosilicate-rich secondary products, such as slags, they can be utilized for the formulation of AAMs. Slags are partially crystalline metallurgical residues produced during the high temperature separation of metallic and non-metallic materials in the steelmaking processes. In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as precursors in an alkali-activation process. EAF slag, with its amorphous fraction of about 56%, presented higher contents of soluble Si and Al species with respect to ladle slag R (35%). However, both are suitable to produce AAM. The leaching behavior shows that all the release values are below the regulation limit. All the bivalent ions (Ba, Cd, Cu, Ni, Pb, and Zn) are well immobilized in a geopolymeric matrix, while amphoteric elements, such as As and Cr, show a slight increase of release with respect to the corresponding slag in alkaline and aqueous environments. In particular, for Sb and As of AAM, release still remains below the regulation limits, while Mo presents an increase of leaching values that slightly exceeds the limit for landfill non-dangerous waste.

scholarly journals Assessing the long term effects on climate change of metallurgical slags valorization as construction material: a comparison between static and dynamic global warming impacts

2021 ◽  
Vol 1 (1) ◽  
pp. 88-111
Author(s):  
Andrea Di Maria ◽  
◽  
Annie Levasseur ◽  
Karel Van Acker ◽  
◽  
...  
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Carbon Footprint ◽  
Building Materials ◽  
Construction Material ◽  
Steel Slag ◽  
Construction Materials ◽  
Long Term Effects ◽  
Stainless Steel Slag ◽  
Environmental Evaluation

<abstract> <p>The interest in circular economy for the construction sector is constantly increasing, and Global Warming Potential (GWP) is often used to assess the carbon footprint of buildings and building materials. However, GWP presents some methodological challenges when assessing the environmental impacts of construction materials. Due to the long life of construction materials, GWP calculation should take into consideration also time-related aspects. However, in the current GWP, any temporal information is lost, making traditional static GWP better suited for retrospective assessment rather than forecasting purposes. Building on this need, this study uses a time-dependent GWP to assess the carbon footprint of two newly developed construction materials, produced through the recycling of industrial residues (stainless steel slag and industrial goethite). The results for both materials are further compared with the results of traditional ordinary Portland cement (OPC) based concrete, presenting similar characteristics. The results of the dynamic GWP (D_GWP) are also compared to the results of traditional static GWP (S_GWP), to see how the methodological development of D_GWP may influence the final environmental evaluation for construction materials. The results show the criticality of the recycling processes, especially in the case of goethite valorization. The analysis shows also that, although the D_GWP did not result in a shift in the ranking between the three materials compared with S_GWP, it provides a clearer picture of emission flows and their effect on climate change over time.</p> </abstract>

Investigating the binding potential of continuous casting stainless steel slag by alkali activation

2014 ◽  
Vol 26 (5) ◽  
pp. 256-270 ◽  
Author(s):  
Muhammad Salman ◽  
Özlem Cizer ◽  
Yiannis Pontikes ◽  
Ruben Snellings ◽  
Lucie Vandewalle ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Continuous Casting ◽  
Steel Slag ◽  
Binding Potential ◽  
Alkali Activation ◽  
Stainless Steel Slag

scholarly journals Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 644
Author(s):  
Maria Harja ◽  
Carmen Teodosiu ◽  
Dorina Nicolina Isopescu ◽  
Osman Gencel ◽  
Doina Lutic ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Building Materials ◽  
Simple Procedure ◽  
Xrd Analysis ◽  
Partial Hydrolysis ◽  
Alkali Activation ◽  
Activation Process ◽  
Solid Ratio ◽  
Powder Xrd Analysis

Fly ash wastes (silica, aluminum and iron-rich materials) could be smartly valorized by their incorporation in concrete formulation, partly replacing the cement. The necessary binding properties can be accomplished by a simple procedure: an alkali activation process, involving partial hydrolysis, followed by gel formation and polycondensation. The correlations between the experimental fly ash processing conditions, particle characteristics (size and morphology) and the compressive strength values of the concrete prepared using this material were investigated by performing a parametric optimization study to deduce the optimal processing set of conditions. The alkali activation procedure included the variation of the NaOH solutions concentration (8–12 M), temperature values (25–65 °C) and the liquid/solid ratio (1–3). The activation led to important modifications of the crystallography of the samples (shown by powder XRD analysis), their morphologies (seen by SEM), particle size distribution and Blaine surface values. The values of the compressive strength of concrete prepared using fly ash derivatives were between 16.8–22.6 MPa. Thus, the processed fly ash qualifies as a proper potential building material, solving disposal-associated problems, as well as saving significant amounts of cement consumed in concrete formulation.

Effect of curing temperatures on the alkali activation of crystalline continuous casting stainless steel slag

2014 ◽  
Vol 71 ◽  
pp. 308-316 ◽  
Author(s):  
Muhammad Salman ◽  
Özlem Cizer ◽  
Yiannis Pontikes ◽  
Lucie Vandewalle ◽  
Bart Blanpain ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Continuous Casting ◽  
Steel Slag ◽  
Alkali Activation ◽  
Stainless Steel Slag

Energy, environmental and technical assessment for the incorporation of EAF stainless steel slag in ceramic building materials

2017 ◽  
Vol 142 ◽  
pp. 1778-1788 ◽  
Author(s):  
Rosendo J. Galán-Arboledas ◽  
Javier Álvarez de Diego ◽  
Michele Dondi ◽  
Salvador Bueno
Keyword(s):  
Stainless Steel ◽  
Building Materials ◽  
Steel Slag ◽  
Stainless Steel Slag ◽  
Ceramic Building ◽  
Technical Assessment

Alkali Activation of AOD Stainless Steel Slag Under Steam Curing Conditions

2015 ◽  
Vol 98 (10) ◽  
pp. 3062-3074 ◽  
Author(s):  
Muhammad Salman ◽  
Özlem Cizer ◽  
Yiannis Pontikes ◽  
Ruben Snellings ◽  
Jan Dijkman ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Steel Slag ◽  
Alkali Activation ◽  
Steam Curing ◽  
Stainless Steel Slag ◽  
Curing Conditions

scholarly journals Utilization of induction furnace steel slag based iron oxide nanocomposites for antibacterial studies

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
J. Baalamurugan ◽  
V. Ganesh Kumar ◽  
T. Stalin Dhas ◽  
S. Taran ◽  
S. Nalini ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Iron Oxide ◽  
Building Materials ◽  
Induction Furnace ◽  
Micrococcus Luteus ◽  
Bacterial Species ◽  
Steel Slag ◽  
If Steel ◽  
Growth Inhibitory ◽  
Microplate Reader

AbstractMetals and metal oxide-based nanocomposites play a significant role over the control of microbes. In this study, antibacterial activity of iron oxide (Fe2O3) nanocomposites based on induction furnace (IF) steel slag has been carried out. IF steel slag is an industrial by-product generated from secondary steel manufacturing process and has various metal oxides which includes Al2O3 (7.89%), MnO (5.06), CaO (1.49%) and specifically Fe2O3 (14.30%) in higher content along with metalloid SiO2 (66.42). Antibacterial activity of iron oxide nanocomposites has been revealed on bacterial species such as Micrococcus luteus, Bacillus subtilis and Staphylococcus aureus. Micrococcus luteus has undergone maximum zone of inhibition (ZOI) of 12 mm for 10 mg/mL concentration of steel slag iron oxide nanocomposite. Growth inhibitory kinetics of bacterial species has been studied using ELISA microplate reader at 660 nm by varying the concentration of steel slag iron oxide nanocomposites. The results illustrate that IF steel slag is a potential material and can be utilized in building materials to increase the resistance against biodeterioration. Graphic abstract

scholarly journals Evaluation of Physical Properties of a Metakaolin-Based Alkali-Activated Binder Containing Waste Foam Glass

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5458
Author(s):  
Petra Mácová ◽  
Konstantinos Sotiriadis ◽  
Zuzana Slížková ◽  
Petr Šašek ◽  
Michal Řehoř ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Foam Glass ◽  
Glass Production ◽  
Alkali Activation ◽  
Activation Process ◽  
X Ray ◽  
Thermal Insulating ◽  
The Matrix ◽  
Alkali Activated

Foam glass production process redounds to large quantities of waste that, if not recycled, are stockpiled in the environment. In this work, increasing amounts of waste foam glass were used to produce metakaolin-based alkali-activated composites. Phase composition and morphology were investigated by means of X-ray powder diffraction, Fourier-transform infrared spectroscopy and scanning electron microscopy. Subsequently, the physical properties of the materials (density, porosity, thermal conductivity and mechanical strength) were determined. The analysis showed that waste foam glass functioned as an aggregate, introducing irregular voids in the matrix. The obtained composites were largely porous (>45%), with a thermal conductivity coefficient similar to that of timber (<0.2 W/m∙K). Optimum compressive strength was achieved for 10% incorporation of the waste by weight in the binder. The resulting mechanical properties suggest the suitability of the produced materials for use in thermal insulating applications where high load-bearing capacities are not required. Mechanical or chemical treatment of the waste is recommended for further exploitation of its potential in participating in the alkali activation process.

scholarly journals Experimental Study on Precipitation Behavior of Spinels in Stainless Steel-Making Slag under Heating Treatment

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 487 ◽  
Author(s):  
Jianli Li ◽  
Qiqiang Mou ◽  
Qiang Zeng ◽  
Yue Yu
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Steel Slag ◽  
Calcium Content ◽  
Heating Time ◽  
X Ray Diffraction ◽  
Stainless Steel Slag ◽  
Steel Making ◽  
Heating Treatment ◽  
The Stability

The stability of chromium in stainless steel slag has a positive correlation with spinel particle size and a negative correlation with the calcium content of the spinel. The effect of heating time on the precipitation of spinel crystals in the CaO-SiO2-MgO-Al2O3-Cr2O3-FeO system was investigated in the laboratory. Scanning electron microscopy with energy-dispersive and X-ray diffraction were adopted to observe the microstructure, test the chemical composition, and determine the mineral phases of synthetic slags, and FactSage7.1 was applied to calculate the crystallization process of the molten slag. The results showed that the particle size of the spinel crystals increased from 9.42 to 10.73 μm, the calcium content in the spinel crystals decreased from 1.38 at% to 0.78 at%, and the content of chromium in the spinel crystal increased from 16.55 at% to 22.78 at% with an increase in the heating time from 0 min to 120 min at 1450 °C. Furthermore, the species of spinel minerals remained constant. Therefore, an extension in the heating time is beneficial for improving the stability of chromium in stainless steel slag.

Sign in / Sign up

Export Citation Format

Share Document