Inorganic Polymer Cement from Fe-Silicate Glasses: Varying the Activating Solution to Glass Ratio

Machiels, Lieven; Arnout, Lukas; Jones, Peter Tom; Blanpain, Bart; Pontikes, Yiannis

doi:10.1007/s12649-014-9296-5

Cited by 38 publications

(51 citation statements)

References 28 publications

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“…While Ca in the binding phase is claimed to provide charge compensation due to the presence of Al [32,39]; the position of Fe in the framework remains ambiguous. Several authors [3,25] measured relatively high quantities of Fe in the binding phase of IP; however, no structural analysis was provided therein. Lemougna et al [40] observed distorted tetrahedral or 5-coordinated site containing Fe 3?…”

Section: Microchemistry Of the Bindermentioning

confidence: 99%

“…granulation, is mainly amorphous. If lower cooling rates are applied, a range of crystalline phases, such as quartz (SiO 2 ), magnetite (Fe 3 O 4 ), wüstite (FeO), hercynite (FeAl 2 O 4 ), anorthite (CaAl 2 Si 2 O 8 ), augite ((Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2 O 6 ), periclase (MgO) or lime (CaO), may be present [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, the main factor influencing the strength was not the amount of Fe, as had been expected, but the degree of swelling and foaming which was caused by the generation of hydrogen from the residual Al present in the slags. In the work of Machiels et al [3], the microstructure of IP from Fe-silicate glasses was investigated, while modifying the activating solution to solid (L/S) mass ratio. They showed, that lowering the L/S ratio resulted in a denser IP with less cracks and a higher compressive strength.…”

Section: Introductionmentioning

confidence: 99%

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Inorganic Polymers from a Plasma Convertor Slag: Effect of Activating Solution on Microstructure and Properties

Krisková

Machiels

Pontikes

2015

J. Sustain. Metall.

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Plasma processing of materials is a technology now also employed in the management of municipal solid wastes, often mixed with industrial residues. The specifics depend per case, but typically the process delivers energy, in the form of a gas or heat, a metal-rich fraction as well as a slag. The slag, containing mainly Si-, Fe-, Ca-and Al-oxides, is almost completely amorphous after rapid cooling and thus could possibly be used as precursor in the synthesis of inorganic polymers (IP). The latter is explored in the present work. Slag resembling the composition of refuse-derived fuel ash was mixed with various Na-silicate activating solutions, and the effect of SiO 2 /Na 2 O as well as H 2 O/Na 2 O molar ratio on the synthesis and mechanical properties of the prepared IP was investigated. It was found that for SiO 2 / Na 2 O molar ratios of 1.2 and H 2 O/Na 2 O molar ratio of 30.8, the mechanical strength of casted IP reached almost 90 MPa after 90 days. Further decrease in the SiO 2 /Na 2 O ratio, accompanied by decrease in the H 2 O/Na 2 O ratio, increased the early strength and the released reaction heat, but had no effect on the late strength. In addition to that, crack formation was pronounced. The increase of the concentration of activating solution, by means of reducing the water content level, i.e. H 2 O/Na 2 O, resulted in an increase of the released reaction heat as well as an increase of the mechanical strength, up to 112 MPa at 90 days. The above results are relevant to a range of metallurgical slags and other vitreous by-products and contribute towards more high added-value applications.

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Section: Microchemistry Of the Bindermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inorganic Polymers from a Plasma Convertor Slag: Effect of Activating Solution on Microstructure and Properties

Krisková

Machiels

Pontikes

2015

J. Sustain. Metall.

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“…The synthesis gas can be used for production of electrical energy and/or heat or as second-generation liquid fuels. In addition, several valorization possibilities have been proposed for plasmastone (Iacobescu et al, 2013;Pontikes et al, 2013;Machiels et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…So far, fly ash and other by-products of the energy and materials industry, currently disposed of as waste, have been used to produce these alternative products (Huntzinger and Eatmon, 2009;Turgut, 2012;Van den Heede and De Belie, 2012). Machiels et al (2014) and Iacobescu et al (2013) explained the possibility of developing binding materials from plasmastone to be used as low-carbon alternatives for OPC in construction applications.…”

Section: Introductionmentioning

confidence: 99%

Valorization of thermal treatment residues in Enhanced Landfill Mining: environmental and economic evaluation

Danthurebandara

Passel

Machiels

et al. 2015

Journal of Cleaner Production

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Mineralogy and glass content of Fe‐rich fayalite slag size fractions and their effect on alkali activation and leaching of heavy metals

Adediran

Yliniemi

Illikainen

2021

Int J Ceramic Engine & Sci

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Fayalite slag (FS) is an Fe-rich nonferrous metallurgy (CaO-MgO-) FeOx-SiO 2 slag originating from nickel or copper manufacturing processes, which currently is disposed to landfills or used in low-value applications. This study investigates the mineralogy and glass content of certain sized fractions of FS and how it influences the reactivity, mechanical, and microstructural properties of the alkaliactivated materials produced. Water-quenched granular FS was sieved into two size fractions: namely, a fine fraction (FF) with a particle size range of 0-0.5 mm and a coarse fraction (CF) with a particle size range of 1.5-2 mm. It was then milled to a similar median particle size of 10 μm to be used as a binder precursor. The reaction kinetics of each fraction was determined via thermal analysis microcalorimeter, and the microstructural evolution and chemical composition of the binder were studied using a scanning electron microscope coupled with an energy dispersive X-ray spectroscopy. The environmental leaching behavior of both fractions before and after alkali activation was assessed according to the EN 12457-2 standard. The results showed that both fractions consisted of fayalite, magnetite crystalline phases, and MgO-SiO 2 -FeOx (-CaO-Al 2 O 3 ) glass phase. However, FF had a higher glass content (63 wt.%) in comparison to CF (39 wt.%), and, consequently, FF was more reactive under alkali activation, as evidenced by faster reaction kinetics, faster strength development, and improved microstructural properties. Alkali-activated samples had differences in the chemical compositions of their binder gels at early stages, though later, their binders became increasingly homogenous and consisted of an Na-K-Fe-Si gel with Mg, Ca, and Al as minor constituents in both samples. Additionally, the leaching behavior of potentially toxic metals and substances from precursors and alkali-activated samples prepared was below the limits set for paved structures as specified by Finnish legislation.

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Inorganic Polymer Cement from Fe-Silicate Glasses: Varying the Activating Solution to Glass Ratio

Cited by 38 publications

References 28 publications

Inorganic Polymers from a Plasma Convertor Slag: Effect of Activating Solution on Microstructure and Properties

Inorganic Polymers from a Plasma Convertor Slag: Effect of Activating Solution on Microstructure and Properties

Valorization of thermal treatment residues in Enhanced Landfill Mining: environmental and economic evaluation

Mineralogy and glass content of Fe‐rich fayalite slag size fractions and their effect on alkali activation and leaching of heavy metals

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