Applied Mechanochemistry

Baláž, Peter

doi:10.1007/978-3-540-74855-7_6

Cited by 16 publications

(11 citation statements)

References 111 publications

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“…The entire reactor, or part of it, undergoes periodic motion aimed at inducing collisions of the balls inside the reactor with each other and with the reactor walls. 1−4,18 The colliding surfaces of the milling media trap powder particles in between and subject them to mechanical loading. Non-hydrostatic mechanical stresses arise at every contact point between any pair of powder particles.…”

Section: Characterization Of Processing Conditionsmentioning

confidence: 99%

“…Numerical simulations suggest that the amount of mechanical energy that can be transferred to the powder during a collision depends on the velocity of the ball and on the angle of contact between the colliding milling media. 18,21−24,26,27,44 Indirect evidence has been noted from the study of physical and chemical transformations that point out that the transformation rate, and the nature of transformation itself, depend on the milling frequency and the mass and number of balls, thus indicating a role of collision energy. 18,21−24,26,27,44 Numerous studies have been performed to estimate such quantities from the numerical description of the milling dynamics.…”

Section: Characterization Of Processing Conditionsmentioning

confidence: 99%

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Processing and Investigation Methods in Mechanochemical Kinetics

et al. 2018

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The present work focuses on the challenges that emerge in connection with the kinetics of mechanically activated transformations. This is an important topics to comprehend to enable the full exploitation of mechanical processing in a broad spectrum of areas related to chemistry and materials science and engineering. Emerging challenges involve a number of facets regarding materials and material properties, working principles of ball mills and milling conditions, and local changes occurring in series in processed materials. Within this context, it is highly desirable to relate the nature and rate of observed mechanochemical transformations to individual collisions and then to the processes induced by mechanical stresses on the molecular scale. Hence, it is necessary to characterize the milling regimes that can establish in ball mills regarding frequency and energy of collisions, map the relationship between milling dynamics and transformation kinetics, and obtain mechanistic information through proper time-resolved investigations in situ . A few specific hints are provided in this respect.

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Section: Characterization Of Processing Conditionsmentioning

confidence: 99%

Section: Characterization Of Processing Conditionsmentioning

confidence: 99%

Processing and Investigation Methods in Mechanochemical Kinetics

et al. 2018

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“…Mechanical activation leads to amorphization of the mineral material by disordering its crystal structure or inducing phase transitions, causing a more facile decomposition (Baláž, 2000). Also, the decomposition temperature of minerals can be reduced by MA during milling (Baláž, 2000(Baláž, , 2008. Zhang et al (2010) enhanced Cr leaching from chromite ore in molten NaOH by applying MA.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…III). As the MA time was increased the XRD peaks were broadened and less intense, which indicates a decrease of crystallinity (and crystal sizes) and thus amorphization of the material (Baláž, 2000(Baláž, , 2008).…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Valorization of stainless steel slag by selective chromium recovery and subsequent carbonation of the matrix material

Kim

Spooren

Broos

et al. 2016

Journal of Cleaner Production

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This study focuses on the recycling of stainless steel (SS) slags containing about 1.2 wt% of chromium (Cr). The selective recovery of Cr from SS slag by a hydrometallurgical method (alkaline pressure leaching) was investigated. Leaching experiments were carried out based on 2 4-1 factorial design of experiment (DOE) with the following parameters: NaOH concentration, temperature, leaching time, and mechanical activation (MA). Results show that temperature and MA are the most influencing factors for an enhanced Cr leaching. The maximum Cr leaching was 46% at 1 M NaOH, 240 o C, 6 h, MA 30 min, while the matrix material was dissolved only to a limited extent (Al 2.88%, Si 0.12%, Ca 0.05%). After Cr leaching followed by alkali washing, a carbonation treatment is proposed to stabilise the remaining Cr in the matrix material and make the subsequent recycling of the matrix material as a construction material possible. 10 Chromium can be recovered from the leachate and alkali/water washing solution by ion exchange or precipitation.

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“…Indeed the ability to produce fire is considered a crucial landmark for human development, and archeological evidences indicate that anthropogenic fire production relied on wood-on-wood friction or on percussion or friction of a siliceous rock against pyrite [2–3]. Mechanochemistry comes with intrinsic advantages associated with the lack of solvent use during reaction, thus largely reducing the generation of waste [4] even in active pharmaceutical ingredient synthesis [5]. Yet mechanochemistry also allows the production of novel materials, which are distinct from what is enabled via solvothermal methods [6–8].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical amorphization of chitin: impact of apparatus material on performance and contamination

Nardo¹,

Moores²

2019

Beilstein J. Org. Chem.

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Herein, we present a study of the impact of the jar and ball medium on the performance in the mechanochemical amorphization of chitin. We measured the crystallinity index of chitin after milling it in a vibration mill in an apparatus made of copper, aluminum, brass, tungsten carbide, zirconia, stainless steel, polytetrafluoroethylene (PTFE), or poly(methyl methacrylate) (PMMA). These materials offer a range of Vickers hardness values and the impact of these parameters is discussed. The role of the size and mass of the balls is also studied in the case of stainless steel. This study also highlights one of the major challenges during milling, which is contamination of the studied samples.

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Applied Mechanochemistry

Cited by 16 publications

References 111 publications

Processing and Investigation Methods in Mechanochemical Kinetics

Processing and Investigation Methods in Mechanochemical Kinetics

Valorization of stainless steel slag by selective chromium recovery and subsequent carbonation of the matrix material

Mechanochemical amorphization of chitin: impact of apparatus material on performance and contamination

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