Geopolymerization behavior of Cu–Ni slag mechanically activated in air and in CO2 atmosphere

Калинкин, А. М.; Kumar, Sanjay; Гуревич, Б. И.; Alex, T C; Калинкина, Е. В.; Tyukavkina, V. V.; Калинников, В. Т.; Kumar, Rakesh

doi:10.1016/j.minpro.2012.05.001

Cited by 61 publications

(15 citation statements)

References 29 publications

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“…Substantial volumes of these slags are generated annually, with their applications typically being of low-added value, such as, abrasive tools or aggregates in concrete or asphalt [8]. The use of these materials as precursors in the synthesis of inorganic polymers (IP) seems to be a promising way for higher added value applications as well as a contribution to sustainability, considering that the IP constitutes a smaller CO 2 footprint binder compared to traditional portland cement (OPC) [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Leaching was evaluated for pH in a range of 5-12.5, and it was demonstrated that Pb leaching decreased, while Zn and As leaching increased compared to the leaching of raw materials. Kalinkin et al [8] synthesised IP using a mechanically activated Cu-Ni slag. They reached 81 MPa of compressive strength after 28 days, whereas when the Cu-Ni slag was mechanically activated in CO 2 atmosphere, the 28th day strength increased to 94 MPa.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…(w/s: water to solid ratio). From Table 4, it can be seen that MA in CO 2 is not preferable to air to achieve high compressive strengths, as has been described for magnesia ferriferous slag [41]. However, the compressive strengths of binders prepared following MA in CO 2 -particularly in the case of AT cured in dry conditions-were similar to those prepared from mineral component that had been milled in air.…”

Section: Mineral Componentmentioning

confidence: 63%

“…The carbonisation of silicates is notably increased if MA is carried out in a pure CO 2 atmosphere [38][39][40]. It has also been shown that MA of magnesia ferriferous Cu-Ni slag in CO 2 resulted in an alkali-activated slag binder with higher compressive strength compared with that produced using MA in air [41]. The aim of this study was to investigate the influence of MA on the alkaline-activation behaviour of antigorite and antigorite-containing ore dressing tailings.…”

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Binder Based on Milled Antigorite

2018

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Antigorite is a very common rock-forming mineral and it is often present in mining wastes. Utilization of these wastes is a very important issue from the environmental point of view. A potential use for mining wastes is for the production of building materials. This study investigated the alkali activation of antigorite and antigorite-containing ore dressing tailings (AT) milled in a planetary ball mill in an air or CO2 atmosphere. The specific surface area, amorphisation, and dehydroxylation of milled antigorite and AT were examined, and their effect on the cementitious properties was investigated. Binders were prepared by mixing the milled antigorite or AT with liquid glass and curing at 20 ± 2 °C in dry (relative humidity of 65 ± 5%) or humid (relative humidity of 95 ± 5%) conditions for up to 28 days. Curing at dry conditions was found to produce binders with increased strengths. The compressive strength of the alkali-activated binder also increased with increased milling time. For AT milled in air for 4 min and cured in dry conditions for 28 days, the compressive strength was 49 MPa. The milling atmosphere (air or CO2) influenced the cementitious properties of the alkali activated binder to a small extent.

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“…Geopolymers (alkali activated binders), eco-friendly materials with much lower CO 2 emissions produced from different sources such as fly ash [7][8][9], slags [10][11][12] and metakaolin [13], individually or together, are considered as the main possible substitution materials of ordinary Portland cement-(OPC)-based concrete. The most attractive constructional raw material for geopolymer production is fly ash because of its availability and cheaper price.…”

Section: Introductionmentioning

confidence: 99%

Modelling of fracture strength of functionally graded geopolymer

Nazari

2014

Construction and Building Materials

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Geopolymerization behavior of Cu–Ni slag mechanically activated in air and in CO2 atmosphere

Cited by 61 publications

References 29 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

Alkali-Activated Binder Based on Milled Antigorite

Modelling of fracture strength of functionally graded geopolymer

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