Carbon sequestration through accelerated carbonation of BOF slag: Influence of particle size characteristics

Polettini, Alessandra; Pomi, Raffaella; Stramazzo, A.

doi:10.1016/j.cej.2016.04.015

Cited by 114 publications

(40 citation statements)

References 38 publications

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“…Polettini et al 26) specifically evaluated the significance of particle size distribution (PSD) on slag-based CO 2 mineralization; their results confirm the basic geometric logic of increased SA promoting faster overall reaction rate and increased conversion. Despite its critical importance, PSD is not appropriately quantified in most papers.…”

Section: Surface Areamentioning

confidence: 79%

Effect of Solidification and Cooling Methods on the Efficacy of Slag as a Feedstock for CO<sub>2</sub> Mineralization

Myers

Nakagaki

2018

ISIJ Int.

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Iron and steel making (ISM) slag is often utilized to partially offset CO 2 emissions associated with metal production. Currently, the primary recycling method for slag is as β-Ca 2 SiO 4 utilized in the cement industry, termed ground granulated blast furnace slag (ggbs). However, the cement market is not large enough to exploit the entirety of ISM slag as ggbs, relegating a large quantity of slag to reuse pathways with minor impacts on CO 2 reduction. Recent years have seen an increase in research into mineralizing CO 2 using the Ca and Mg content of ISM slags as a feedstock. Unfortunately, it has not been widely recognized that the solidification and cooling processes of slag dramatically effects its efficacy as a CO 2 mineralizing feedstock via modification of mineralogy, crystallinity, grain size, and micromorphology. This paper clarifies the key properties determining mineralization effectiveness and elucidates how to control these properties during the solidification and cooling process. The effect of solidification and cooling method on net CO 2 reduction is shown to be strongly dependent on solidification and cooling method along with the CO 2 intensity of energy generation.

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Section: Surface Areamentioning

confidence: 79%

Effect of Solidification and Cooling Methods on the Efficacy of Slag as a Feedstock for CO<sub>2</sub> Mineralization

Myers

Nakagaki

2018

ISIJ Int.

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“…Slag samples were collected at the outlet of the BOF from an Italian steelmaking plant adopting the integrated process layout. The slag was separated through dry sieving into various size fractions, and the 63−100 μm size class was then specifically selected for the present study, having been shown in preliminary investigations to display the highest carbonation yield. This was motivated by the fact that, although both minerals dissolution from the slag and CO 2 uptake are expected to increase with surface area, there are in fact secondary effects associated with particle size that affect the actual CO 2 sequestration potential achievable.…”

Section: Methodsmentioning

confidence: 99%

“…This was motivated by the fact that, although both minerals dissolution from the slag and CO 2 uptake are expected to increase with surface area, there are in fact secondary effects associated with particle size that affect the actual CO 2 sequestration potential achievable. For a detailed discussion of such effects, the reader is referred to our previous study on the subject …”

Section: Methodsmentioning

confidence: 99%

Energetic assessment of CO₂ sequestration through slurry carbonation of steel slag: a factorial study

et al. 2016

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An assessment of the energetic requirements of slurry‐phase accelerated carbonation for CO2 sequestration using steelmaking slag was conducted. The results of dedicated lab‐scale carbonation experiments in which the CO2 sequestration yield of basic oxygen furnace slag was investigated at different operating conditions were used for the energy requirement calculations. The operating variables of the process and the associated values adopted were total gas pressure, temperature, and CO2 concentration in the gas phase. The energy duties of the slurry‐phase carbonation layout were calculated for the different unit operations, which included slag milling, mixing, slurry pumping, heating, CO2 compression, solid/liquid separation, and CO2 capture (when required). The estimated energy requirements were found to lie in the range 980−6300 MJ t−1 CO2 sequestered, where the lower end of the range was associated with the use of diluted CO2. In all cases, the use of a concentrated CO2 flow proved largely energetically unfavorable over the use of diluted gas streams, since the energy duty of the required CO2 capture stage by far overcame the benefits associated with improved sequestration yields at increased CO2 concentrations in the gas phase. The calculated energy requirements were also processed to derive a second‐order model accounting for the main effects and interactions between the operating variables of the carbonation process. The model developed is meant to predict the expected energy demand of the carbonation process under different operating conditions and to define the optimal combination of these in terms of the energetic profile of the process itself. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…Industrial wastes containing divalent metal usually have higher chemical reactivity and their corresponding MC can therefore achieve an acceptable rate of CO 2 conversion under milder conditions 6,80 . Furthermore, industrials wastes can come from various resources, for example, the coal fly ash (FA) 20,[81][82][83][84][85] , metallurgical slag [86][87][88][89] . Meanwhile, the applied technology is the same as that of MC by silicate minerals.…”

Section: By Industrial Wastesmentioning

confidence: 99%

“…Meanwhile, the valuable vanadium and chromium metals were released into solution during MC. Polettini et al 89 analyzed in details the effects of particle size on the MC by BOF slag. They found the effect was considerable.…”

Section: By Industrial Wastesmentioning

confidence: 99%

The technology of CO₂ sequestration by mineral carbonation: current status and future prospects

Wang

Dreisinger

Jarvis³

et al. 2017

Canadian Metallurgical Quarterly

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This paper has been submitted for publication in the Canadian Metallurgical Quarterly (CMQ) journal. The technology of CO 2 sequestration by mineral carbonation: Current status and future prospects Abstract Mineral carbonation (MC) has been extensively researched all over the world since it was found as a natural exothermic process to permanently and safely sequester CO 2. In order to accelerate the natural process, various methods for carbonation of Mg-/Casilicate minerals and other industrial wastes have been studied. It has been found that the MC efficiency will increase with an increase of CO 2 pressure, retention time, temperature, mass ratio of Mg or Ca to Si in minerals, specific surface area, and the slurry concentration in a specific range, and with the introduction of effective catalysts, for example, 1M NaCl and 0.64M NaHCO 3 or carbonic anhydrase. However, there still is not a successful industrial application because of high economic cost and slow reaction rate. It is not economic to exploit Mg-and Ca-silicate minerals deposits or tailings to sequester CO 2 by MC, due to the cost of grinding and heat pre-treatment and in some cases the whole sequestration process may result in more CO 2 emissions than the amount of CO 2 sequestered due to the requirements of energy inputs. The process however, may be profitable as a whole (with carbon credits). It is suggested to combine MC with recovery of valuable metals from ore deposits in order to reduce the cost for MC by cost sharing for mineral recovery.

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Carbon sequestration through accelerated carbonation of BOF slag: Influence of particle size characteristics

Cited by 114 publications

References 38 publications

Effect of Solidification and Cooling Methods on the Efficacy of Slag as a Feedstock for CO<sub>2</sub> Mineralization

Effect of Solidification and Cooling Methods on the Efficacy of Slag as a Feedstock for CO<sub>2</sub> Mineralization

Energetic assessment of CO₂ sequestration through slurry carbonation of steel slag: a factorial study

The technology of CO₂ sequestration by mineral carbonation: current status and future prospects

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Carbon sequestration through accelerated carbonation of BOF slag: Influence of particle size characteristics

Cited by 114 publications

References 38 publications

Effect of Solidification and Cooling Methods on the Efficacy of Slag as a Feedstock for CO<sub>2</sub> Mineralization

Effect of Solidification and Cooling Methods on the Efficacy of Slag as a Feedstock for CO<sub>2</sub> Mineralization

Energetic assessment of CO2 sequestration through slurry carbonation of steel slag: a factorial study

The technology of CO2 sequestration by mineral carbonation: current status and future prospects

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Product

Resources

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Energetic assessment of CO₂ sequestration through slurry carbonation of steel slag: a factorial study

The technology of CO₂ sequestration by mineral carbonation: current status and future prospects