Rejuvenation of granulated blast furnace slag (GBS) glass by ball milling

Sarcos, Natalja Romero; Hart, Daniel C.; Bornhöft, Hansjörg; Ehrenberg, Andreas; Deubener, Joachim

doi:10.1016/j.jnoncrysol.2020.120557

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…Since the reaction rate depends on the surface area [24], the grinding procedure can be iterated to produce similar granulometric characteristics, which allows for a better comparison of the reactivity in the calorimetrybased testing. However, utilizing a standardized grinding process in the present study was based on the previously reported non-breakage effects introduced by grinding [55]. Comparing Figures 9A and 13A, the progression of the recorded heat follows a similar pattern, i.e., an initial high reaction rate followed by a kink and, finally, the progressive depletion of the slags from continuous dissolution and reaction.…”

Section: Robustness Of Methodologymentioning

confidence: 72%

“…Therefore, comparing different chemical compositions requires the absence of crystallization in combination with similar specific surface areas of the materials. Ideally, reaching these granulometric properties should be achieved under similar input energies from grinding, as excessive grinding has been shown to induce non-breakage effects that possibly could relate to improved reactivity [55]. The original slag and the three remelted slags, granulated on a laboratory scale, were ground using the same conditions in the present study.…”

Section: Relevance Of Methodologymentioning

confidence: 99%

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A Method for Synthesizing Iron Silicate Slags to Evaluate Their Performance as Supplementary Cementitious Materials

Andersson,

Brander,

Lennartsson

et al. 2023

Applied Sciences

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Utilizing iron silicate copper slag as supplementary cementitious material (SCM) is a means to improve resource efficiency and lower the carbon dioxide emissions from cement production. Despite multiple studies on the performance of these slags in SCM applications, the variations in cooling procedure, grinding, and methods for evaluating reactivity limit the ability to assess the influence of chemical composition on reactivity from the literature data. In this study, a methodology was developed to synthesize iron silicate slags, which were then evaluated for their inherent reactivity using the R3 calorimeter-based experiments. The results demonstrated that laboratory-scale granulation produced the same reactivity as industrially granulated slag. Furthermore, a synthesized triplicate sample showed high repeatability. Based on these two aspects, this method can be used to systematically study the influence of chemical composition on the inherent reactivity of iron silicate slags while producing results that are directly translatable to industrial slags.

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Section: Robustness Of Methodologymentioning

confidence: 72%

Section: Relevance Of Methodologymentioning

confidence: 99%

A Method for Synthesizing Iron Silicate Slags to Evaluate Their Performance as Supplementary Cementitious Materials

Andersson,

Brander,

Lennartsson

et al. 2023

Applied Sciences

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show abstract

“…Fine grinding-especially at low pressures-can convert crystalline minerals into amorphous compounds. 22) The d at which grinding inevitably acts to induce amorphization instead of generating new surface area (d amorphization ) is calculated by Eq. ( 5).…”

Section: Variation Of Crystallinity 241 Amorphization Via Grindingmentioning

confidence: 99%

Enhancing CO<sub>2</sub> Mineralization Rate and Extent of Iron and Steel Slag via Grinding

2022

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Roughly 10% of the CO 2 emissions from iron and steel making are attributable to the direct release of CO 2 from the thermal decomposition of carbonates to produce flux, mainly CaO, used for impurity removal. Notably, these direct emissions remain even if carbon-based steelmaking is replaced by hydrogen-based steelmaking. After removing impurities from the molten metal, this flux becomes the solid waste product called 'slag', a primarily Ca-silicate material. The transformation of slag back into carbonates is thermodynamically spontaneous with negative ΔG in the ambient environment, meaning that ~10% of the CO 2 emissions from iron and steel making could be negated if equipment and methods were developed to support CO 2 mineralization. However, the rate of CO 2 mineralization using slag is slowed by several environmental, geometric, and processing factors. We leverage an experimentally verified model of CO 2 mineralization to determine how to efficiently accelerate the process. Increasing the crystallinity of slag, increasing the relative humidity, and reducing the grain size of slag particles provide the greatest increase in CO 2 mineralization rate at the lowest energy penalty. Increasing the concentration of CO 2 and the temperature provide only modest increases in the CO 2 mineralization rate while incurring a substantial energy penalty. For steelmaking slags, CO 2 mineralization represents low-hanging fruit as the current reuse pathways are low value. For ironmaking slag, replacing the production of amorphous slag for the cement industry with the production of crystalline slag for CO 2 mineralization becomes financially preferable when a carbon price/tax exceeds 67.40 USD/t-CO 2 .

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Performance of Ground Granulated Iron Silicate Slag as a Supplementary Cementitious Material: The Effect of Granulation Temperature and Grinding

Andersson,

Brander,

Lennartsson

et al. 2023

Proceedings of the 62nd Conference of Metallurgists, COM 2023

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Rejuvenation of granulated blast furnace slag (GBS) glass by ball milling

Cited by 5 publications

References 44 publications

A Method for Synthesizing Iron Silicate Slags to Evaluate Their Performance as Supplementary Cementitious Materials

A Method for Synthesizing Iron Silicate Slags to Evaluate Their Performance as Supplementary Cementitious Materials

Enhancing CO<sub>2</sub> Mineralization Rate and Extent of Iron and Steel Slag via Grinding

Performance of Ground Granulated Iron Silicate Slag as a Supplementary Cementitious Material: The Effect of Granulation Temperature and Grinding

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