The onset of particle agglomeration during the dry ultrafine grinding of limestone in a planetary ball mill

Guzzo, Pedro L.; Tino, Alan A.A.; Santos, Juliano B.

doi:10.1016/j.powtec.2015.06.050

Cited by 35 publications

(12 citation statements)

References 24 publications

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“…After 12h, the CI remained essentially unchanged and then reached a platform at 16 h. CI was calculated as a function of ball milling time and their relationship could be characterized by Y = 23.07( e −0.469X ) + 33.47( e −0.01953X ) ( R 2 = 0.9952, Y represents the CI, X represents the milling time). Based on the energy consumption theory, two contrary mechanisms, that is, particle breakage and agglomeration of the so-created fragments, may lead to the achievement of grinding limit when no defects were generated in the crystalline lattice and the crystallite size was not further reduced [ 21 , 22 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Ball Milling Processes on the Microstructure and Rheological Properties of Microcrystalline Cellulose as a Sustainable Polymer Additive

Zheng

Liu

et al. 2018

Materials

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To investigate the effect of ball mill treatment of microcrystalline cellulose (MCC) on the rheological properties of MCC-polymer suspension, the structure and physicochemical characteristics of ground samples with different milling time and the rheological behaviors of MCC-starch suspensions were determined and comprehensively analyzed. During the ball milling process, MCC underwent a morphological transformation from rod-like to spherical shape under the combined effect of breakage and an agglomeration regime. The particle size and crystallinity index of MCC exhibited an exponential declining trend with ball milling time. All of the milled MCC samples presented a crystalline cellulose Iβ structure whereas the MCC mechanically treated in a shorter time had better thermal stability. Rheological measurements of starch/MCC suspensions indicated that all the blended paste exhibited shear thinning behavior and ‘weak’ elastic gel-like viscoelastic properties over the whole investigated range owing to the formation of entangled network structure. The rheological behavior of starch/MCC pastes was strongly dependent on milling time and concentration of MCC samples. The increase in milling time of MCC samples resulted in the loss of rheological properties of starch/MCC pastes, where the size of the MCC playing a dominant role in affecting the properties of composite suspension. In addition, a possible network within starch/MCC suspensions was proposed.

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Section: Resultsmentioning

confidence: 99%

Effects of Ball Milling Processes on the Microstructure and Rheological Properties of Microcrystalline Cellulose as a Sustainable Polymer Additive

Zheng

Liu

et al. 2018

Materials

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“…Dry powder grinding is an important unit operation in many industries, such as mining, food, fine chemical and pharmaceutical, ranging from coarse mineral ore to submicrometer-sized fine drug powder. Recently, ultrafine dry grinding processes with high energy milling (Chen et al, 2015;Guzzo et al, 2015;Kleiv and Thornhill, 2007;Guzzo et al, 2019), which can produce fine particles with improved properties and/or enhanced performance, have attracted much attention. In ultrafine dry grinding processes, planetary ball mills have often been employed since the particles receive remarkably high impact energy at collisions with the grinding balls and the mill pot wall.…”

Section: Introductionmentioning

confidence: 99%

Particle Impact Energy Variation with the Size and Number of Particles in a Planetary Ball Mill

2021

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To investigate the mechanical energy applying to the particles in a grinding process using a planetary ball mill, the impact energy of particles was estimated by simulating the behavior of the particles and grinding balls using the discrete element method (DEM) under different conditions of the size and number of particles, corresponding to their variations during milling. As the impact energy contributing to the particle breakage, we focused on the particle impact energy generated at particle-to-grinding ball/wall and particle-to-particle collisions. The particle size and the number of particles affected the level of particle impact energy at a single collision and the number of collisions of particles, respectively, resulting in an increase of the total impact energy of particles with decreasing particle size and increasing number of particles. The result suggests that milling conditions such as the size of grinding balls should be adjusted appropriately based on the variation of the size and number of particles so that the particles can receive large amounts of the impact energy during milling.

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“…Fine-milling processes can also lead to in-depth chemical transformations, such as the breakdown of various bonds-including covalent bonds-inside the material, which generates free radicals that can persist for varying periods of time depending on ambient conditions and on the chemistry of the materials in the mill. Radical reactions strengthen the intensity of the electrostatic and van der Waals forces [13,14] and lead to stronger agglomeration [15,16]. This phenomenon, which can limit size reduction and even create larger particles through a clustering effect, has been reported and studied for inorganic nanoparticles, but it also occurs in micrometric lignocellulosic particles as their density is lower [14,15].…”

mentioning

confidence: 97%

“…Radical reactions strengthen the intensity of the electrostatic and van der Waals forces [13,14] and lead to stronger agglomeration [15,16]. This phenomenon, which can limit size reduction and even create larger particles through a clustering effect, has been reported and studied for inorganic nanoparticles, but it also occurs in micrometric lignocellulosic particles as their density is lower [14,15]. Mucsi [17] showed a size limit of 1 µm is reached for milling of quartz particles in a stirred media mill, and Karinkata [18] showed a size limit of 20 µm for wood sawdust particles in a vibratory ball mill.As a result, the size of the ground particles and the energy cost of the milling operation are difficult to predict with traditional grinding laws [19,20].…”

mentioning

confidence: 99%

Fine Comminution of Pine Bark: How Does Mechanical Loading Influence Particles Properties and Milling Efficiency?

et al. 2019

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The use of lignocellulosic plant biomass as an alternative to fossil feedstocks for chemistry, energy and materials often involves an intense dry comminution step, for which the energy consumed can vary significantly according to the process parameters, the particle size targeted, and the properties of the biomass. Here we studied the fine milling of maritime pine bark in an impact-mill configuration and in an attrition-mill configuration. The properties of the resulting powders (particle size distribution, particle shape, specific surface area, agglomeration level) obtained in each configuration were compared in relation to process energy consumption. Results evidenced that the agglomeration phenomena drive milling efficiency and limit the possibilities for reaching ultrafine particles. Interestingly, impact loading proved more effective at breaking down coarse particles but tended to generate high agglomeration levels, whereas attrition milling led to less agglomeration and thus to finer particles.

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The onset of particle agglomeration during the dry ultrafine grinding of limestone in a planetary ball mill

Cited by 35 publications

References 24 publications

Effects of Ball Milling Processes on the Microstructure and Rheological Properties of Microcrystalline Cellulose as a Sustainable Polymer Additive

Effects of Ball Milling Processes on the Microstructure and Rheological Properties of Microcrystalline Cellulose as a Sustainable Polymer Additive

Particle Impact Energy Variation with the Size and Number of Particles in a Planetary Ball Mill

Fine Comminution of Pine Bark: How Does Mechanical Loading Influence Particles Properties and Milling Efficiency?

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