Effect of amplitude and frequency of ultrasonic irradiation on morphological characteristics control of calcium carbonate

Kojima, Yoshiyuki; Yamaguchi, Kohei; Nishimiya, Nobuyuki

doi:10.1016/j.ultsonch.2009.10.020

Cited by 60 publications

(33 citation statements)

References 8 publications

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“…The particle size of the sonicated slurries was lower compared to the non-sonicated ones (Fig. 4) in accordance with previous findings (Lu et al, 2002;Rao et al, 2007;Kojima et al, 2010;Santos et al, 2010Santos et al, , 2013a. The average median diameter d(0.5) of cement particles reduced by 35.5%, followed by the particles of CBD (33.5%) and APCr (24%).…”

Section: Sonication At 35 Khz For 1 Hsupporting

confidence: 90%

“…Sonication is known to increase the precipitation rate of calcium carbonate from mineral substrates (Nishida, 2004;Kojima et al, 2010;López-Periago et al, 2011;Santos et al, 2012Santos et al, , 2010Stoica-Guzun et al, 2012), enhance the dissolution rate of CO 2 in water (López-Periago et al, 2010), decrease particle size (Lu et al, 2002;Rao et al, 2007;Kojima et al, 2010;Santos et al, 2010) and increase the dissolution rate of sonicated solids especially for particles with a low surface area (Lu et al, 2002). Important features of sonication are the time of treatment, size of sample, power of the ultrasonic device and temperature (Franco et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of accelerated carbonation of alkaline waste residues by ultrasound

et al. 2016

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The continuous growth of anthropogenic CO2 emissions into the atmosphere and the disposal of hazardous wastes into landfills present serious economic and environmental issues. Reaction of CO2 with alkaline residues or cementitius materials, known as accelerated carbonation, occurs rapidly under ambient temperature and pressure and is a proven and effective process of sequestering the gas. Moreover, further improvement of the reaction efficiency would increase the amount of CO2 that could be permanently sequestered into solid products. This paper examines the potential of enhancing the accelerated carbonation of air pollution control residues, cement bypass dust and ladle slag by applying ultrasound at various water-to-solid (w/s) ratios. Experimental results showed that application of ultrasound increased the CO2 uptake by up to four times at high w/s ratios, whereas the reactivity at low water content showed little change compared with controls. Upon sonication, the particle size of the waste residues decreased and the amount of calcite precipitates increased. Finally, the sonicated particles exhibited a rounded morphology when observed by scanning electron microscopy.

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Section: Sonication At 35 Khz For 1 Hsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Enhancement of accelerated carbonation of alkaline waste residues by ultrasound

et al. 2016

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“…Thus, it has been reported that ultrasonic irradiation can accelerate or retard precipitation , change the crystal size distribution and shape of crystals , or cause agglomeration of particles of different materials. Several authors have been investigating the effect of ultrasound application on the precipitation of calcium carbonate , particularly on its crystal growth , particle size , aggregation , and scaling . Thus the effect of different parameters relevant for sonication, like ultrasonic intensity, type and size of the horn, immersion depth or cavitation has been analysed.…”

Section: Introductionmentioning

confidence: 99%

Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation

Džakula

Kontrec

Ukrainczyk

et al. 2014

Crystal Research and Technology

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This paper reports on the precipitation of CaCO 3 polymorphs, having various crystal morphologies under different conditions. In particular, systems that were subject to ultrasonic irradiation were compared to the corresponding reference systems in the absence of such a treatment. The application of ultrasonic irradiation predominantly resulted in a change of particle size distribution and polymorphic composition of the precipitate, in comparison to the reference systems. Thus, it was found that the supersaturation and temperature influenced the size distribution, in both the reference and sonicated systems. A mixture of calcite, vaterite and aragonite was obtained in all reference systems, at 25°C. At this temperature, the sonication caused the vaterite content to increase, while aragonite was not detected. In reference and sonicated systems at 80°C, only aragonite precipitated. The results also indicate that the principle parameter responsible for the morphology of vaterite was the initial supersaturation: at higher supersaturation spherical vaterite particles precipitated, while at lower supersaturation hexagonal platelets were obtained. The morphological investigations also indicated different mechanisms of vaterite formation in the systems in which precipitation was initiated at higher supersaturation: spherulitic growth of vaterite was observed in sonicated systems, while the aggregation of primary particles was predominant in the reference systems. At lower supersaturation, the effect of c(Ca 2+ )/c(CO 3 2− ) on the morphology of hexagonal platelets of vaterite was observed as well. By varying the c(Ca 2+ )/c(CO 3 2− ), significant changes of the polymorphic composition were observed only in the sonicated systems, at 25°C.

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“…The most important factor is initial concentration (supersaturation). This was not the case for Kojima et al [90] who, by applying larger amplitudes, could promote the formation of the less stable vaterite phase and who suggest that morphological control of CaCO 3 is possible. Mateescu et al [91] find that an ultrasonic field accelerates the formation of stable phases (calcite) from metastable ones (aragonite).…”

Section: General Cavitation Erosion S-curve Of Materials Loss With Tmentioning

confidence: 91%

The Use of the Cavitation Effect in the Mitigation

Heath¹,

Širok²,

Hočevar³

et al. 2013

SV-JME

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Hard mineral scale fouling results in significant economic losses both industrially and domestically. Recently, attempts have been made to use ultrasound to mitigate scale formation and its removal based on the phenomena of cavitation. Cavitation erosion is the removal of material from a solid surface by pressure shock waves associated with the formation and collapse of bubbles. This paper reviews the literature on cavitation erosion of brittle crystalline materials in an attempt to better understand the relationship between the material properties of CaCO 3 scale deposits and its potential removal by cavitation. The study finds that from a materials perspective cavitation erosion is intimately associated with both a material's bulk properties and importantly to its microstructure. The situation is further complicated because the macro and micro-properties of CaCO 3 scale are dependent on many factors relating to its depositional environment. The type of scale formed will affect how it is removed by cavitation.

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Effect of amplitude and frequency of ultrasonic irradiation on morphological characteristics control of calcium carbonate

Cited by 60 publications

References 8 publications

Enhancement of accelerated carbonation of alkaline waste residues by ultrasound

Enhancement of accelerated carbonation of alkaline waste residues by ultrasound

Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation

The Use of the Cavitation Effect in the Mitigation

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