Effects of Mechanical Activation on Physical and Chemical Characteristics of Coal-Gasification Slag

Wu, Feng; Li, Hui; Yang, Kang

doi:10.3390/coatings11080902

Cited by 39 publications

(11 citation statements)

References 36 publications

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“…The accelerated carbonation of the mechanochemically activated biomass ash resulted in the increase in calcite content, while at the same time, the peaks of wollastonite, magnesium silicate, and akermanite were decreased. The increased carbonate content in the cMBA is related to the destruction of Si-O-Si bonds of the polysilicates that are present in the ash upon the mechanochemical activation and subsequently to the increase in active oxygen sites that are available to bind more CO 2 [ 58 ] .…”

Section: Methodsmentioning

confidence: 99%

“…The method has been applied both to improve the reactivity of pozzolanic materials [ 55 , 56 ] and to increase the CO 2 uptake [ 53 , 57 ] of the mechanochemically activated minerals. An increase in amorphization and the breakage of Si-O and Al-O bonds during the process have been reported, creating additional surfaces and active sites on the surfaces of the solid materials to promote reactivities [ 58 ].…”

Section: Introductionmentioning

confidence: 99%

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Biomass Bottom Ash as Supplementary Cementitious Material: The Effect of Mechanochemical Pre-Treatment and Mineral Carbonation

et al. 2022

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The need to mitigate the CO2 emissions deriving from the cement industry becomes imperative as the climate crisis advances. An effective strategy to achieve this is increasing the replacement level of cement clinkers by waste-derived supplementary cementitious materials (SCMs). In this study, the use of mechanochemically activated biomass ash for high-volume (up to 40%) substitution of cement is investigated. The effect of mineral carbonation treatment on the performance of the mechanochemically treated biomass ash as SCM was also examined. The results showed that the mechanochemically treated biomass ash was the most effective SCM, with the respective samples at 40% cement replacement reaching 63% of the strength at 28 days as compared to samples with 100% Portland cement, while only 17% of the strength was achieved in samples with 40% untreated biomass ash. As suggested by the isothermal calorimetry, XRD, FTIR, and TG analysis, the mechanochemical treatment enhanced the reactivity and the filler effect of the biomass ash, leading to improved mechanical performances of these mortars compared to those containing untreated biomass ash. Mineral carbonation reduced the reactivity of the mechanochemically treated biomass ash but still led to better strength performances in comparison to the untreated biomass ash.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomass Bottom Ash as Supplementary Cementitious Material: The Effect of Mechanochemical Pre-Treatment and Mineral Carbonation

et al. 2022

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“…Guo et al [ 12 ] and WU et al [ 13 ] have carried out basic research on the mechanical grinding and activation of CGS, but the influence of particle size distribution (PSD) characteristics of CGS on the mechanical properties of cemented specimens has not been expounded. Scholars at home and abroad for glass powder, fly ash, slag and other auxiliary cementitious materials research shows that the PSD of cementitious materials has a significant impact on the degree of hydration and the development of mechanical properties of cemented specimens.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mechanical Grinding on Particle Characteristics of Coal Gasification Slag

et al. 2022

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Based on the test results of laser particle size analyzer, specific surface area analyzer and infrared spectrometer, the grinding kinetics of coal gasification slag (CGS) was systematically described by using Divas–Aliavden grinding kinetics, Rosin–Rammler–Bennet (RRB) distribution model and particle size fractal theory. The influence of grinding time and particle group of CGS on the strength activity index of mortar was studied by using the strength activity index of mortar and grey correlation analysis. The results show that the particles are gradually refined before mechanical grinding of CGS for 75 min. When the mechanical grinding time is greater than 75 min, the “agglomeration phenomenon” of fine CGS particles led to the decrease in various properties. Divas–Aliavden grinding kinetics, the RRB model and fractal dimension can characterize the change of CGS particle size in the grinding process quantitatively. The strength activity index of CGS at different curing ages is positively correlated with grinding time, and the influence on the later strength activity index is the most obvious. The relationship between CGS particle size distribution and strength activity index were probed using grey correlation analysis. The CGS particle groups with the particle size of 20~30 μm and 10~20 μm have the greatest impact on the early and late strength activity index, respectively. Therefore, the optimal grinding time of CGS as auxiliary cementing material is 75 min, considering factors, such as economy and performance, and the specific surface area (SSA) is 4.4874 m2·g−1.

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“…The authors of the article (Wu et al, 2021) established the effects of the formation of products of mechanochemical transformations due to the occurrence of physicochemical processes of interphase interactions at the site of active centers of the combined components.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Oil by Mechanochemicaly Activated Shungite

Ongarbayev

Baigulbayeva

Zhumakhan

2022

MGPB

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In the paper the sorption capacity of shungite rocks of the Koksu field (Kazakhstan) in relation to the oil from the Karazhanbas and Tengiz fields (Kazakhstan) were studied. Oil spills occurring during production, gathering, transportation, storage and refining, and repair work on wells are an urgent environmental problem. There are effective methods of soil purification, including particular interests addressed to sorption process. The aim of this research is to study oil sorption by shungite rocks of the Koksu deposit after mechanochemical activation. The mechanochemical activation of shungite rock samples was carried out in a planetary ball mill at different speeds of rotation and ratios of ball mass to the sample. The developed sorbents based on shungite rocks of the Koksu deposit were tested for cleaning samples of oil-contaminated soils and their sorption capacities under dynamic and static conditions were determined. For the sorption of oil, the sorbent based on shungite of shale grade (TS) after mechanochemical activation is recommended, which sorption capacity under dynamic conditions is 2.57-2.85 g/g. Sorption of oil from 10 % of oil contaminated soil samples with the sorbents based on shungite after mechanochemical activation showed sorption capacity of 0.44-0.45 g/g in 60 days under static conditions. The practical significance of the research lies in the prospects of using shungite rocks to clean up oil spills.

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Effects of Mechanical Activation on Physical and Chemical Characteristics of Coal-Gasification Slag

Cited by 39 publications

References 36 publications

Biomass Bottom Ash as Supplementary Cementitious Material: The Effect of Mechanochemical Pre-Treatment and Mineral Carbonation

Biomass Bottom Ash as Supplementary Cementitious Material: The Effect of Mechanochemical Pre-Treatment and Mineral Carbonation

Influence of Mechanical Grinding on Particle Characteristics of Coal Gasification Slag

Sorption of Oil by Mechanochemicaly Activated Shungite

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