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

Rajaonarivony, Karine; Rouau, Xavier; Lampoh, Komlanvi; Delenne, Jean‐Yves; Mayer‐Laigle, Claire

doi:10.3390/bioengineering6040102

Cited by 15 publications

(20 citation statements)

References 32 publications

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“…Note that the d10 values obtained in RBM and VBM were smaller for the straw than for the bark, which generally connects to the better grindability of the raw straw material, as discussed above. However, this may be also attributed to a larger extent of agglomeration phenomena in the case of bark particles, as described in previous work (Rajaonarivony et al, 2019;Rajaonarivony et al, 2021). We clarify this point further down in a section on in-depth granulometric analysis of the different classes of particles.…”

Section: Particle Size Distribution Of the Ultrafine Ground Powderssupporting

confidence: 60%

“…The different milling devices do not operate at exactly the same scale and so their milling chambers do not have exactly the same volumes. The milling parameters for each device, summarized in brief in Table 1, were defined based on the work of Rajaonarivony et al (2021) (Rajaonarivony et al, 2021) to enhance the mechanical forces generated by the different devices.…”

Section: Fine Milling Protocolmentioning

confidence: 99%

“…A major concern with ultrafine milling of plant materials is that it is hugely energy-intensive (Karinkanta et al, 2018;Mayer-Laigle et al, 2018b;Wang et al, 2018). In a previous paper, Rajaonarivony et al (2021) compared the dry milling efficiencies of three types of ball mills in terms of mechanical force delivered for the production of very fine powders (20-µm average particle size) from pine bark and wheat straw (Rajaonarivony et al, 2021). They showed that impact and attrition processes resulted in different patterns of energy consumption producing powders with the same average particle size but different specific surface areas (SSA).…”

Section: Introductionmentioning

confidence: 99%

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Properties of biomass powders resulting from the fine comminution of lignocellulosic feedstocks by three types of ball-mill set-up

et al. 2022

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Background: Lignocellulosic biomass has many functionalities that hold huge potential for material, energy or chemistry applications. To support advanced applications, the biomass must be milled into ultrafine powder to increase reactivity. This milling unit operation needs to be fully mastered to deliver high-quality standard end-products. Here we studied the relationship between the characteristics of the starting lignocellulosic plant material and the properties of the resulting ultrafine powder in different ball-mill process routes. Methods: Two lignocellulosic biomasses (pine bark and wheat straw) with contrasted compositional and mechanical properties were milled using three ball-mill set-ups delivering different balances of impact force and attrition force. The resulting powders were analysed for particle characteristics (size, agglomeration extent, shape) and powder flow properties (compressibility, cohesion) using a dynamic powder rheometer. Results: Pine bark is more amenable to a fast particle size reduction than the fibrous wheat straw. The resulting pine bark powders appear less compressible but much more cohesive than the straw powders due to particle shape, density and composition factors. The mill set-up working by attrition as dominant mechanical force (vibratory ball mill) produced a mix of large, elongated particles and higher amounts of fines as it acts mainly by erosion, the resulting powder being more prone to agglomerate due to the abundance of fines. The mill set-up working by impact as dominant mechanical force (rotary ball mill) produced more evenly distributed particle sizes and shapes. The resulting powder is less prone to agglomerate due to a preferential fragmentation mechanism. Conclusions: The attrition-dominant mill yields powders with dispersed particle sizes and shapes and the poorest flow properties, while the impact-dominant mill yields more agglomeration-prone powders. The mill set-up working with impact and attrition as concomitant mechanical forces (stirred ball mill) produces powders with better reactivity and flow properties compared to rotary and vibratory mills.

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Section: Particle Size Distribution Of the Ultrafine Ground Powderssupporting

confidence: 60%

Section: Fine Milling Protocolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of biomass powders resulting from the fine comminution of lignocellulosic feedstocks by three types of ball-mill set-up

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“…A batch-grinding device (ball mill) was used to keep the milling energy input constant, but with fewer balls and a smaller milling volume. Three steel balls were used to generate multiple comminution forces (attrition, shear, and impact) compared to the use of a single ball that mainly generates impact [52]. Moisture content of the maize was standardized between samples to smooth its possible effect on post-milled particle size [29].…”

Section: Psr Index Measurementmentioning

confidence: 99%

Friability of Maize Shoot (Zea mays L.) in Relation to Cell Wall Composition and Physical Properties

et al. 2022

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Maize (Zea mays L.) is widely cultivated worldwide for food, feed, and fuel uses. Maize forage has become a valuable feed material, and there is much interest in characterizing its friability, as friability may shape feed value through its effect on ingestibility. The objective of this study was to characterize the friability of maize forage based on its milling behavior within a collection of inbred lines of maize. We proposed two friability indexes—Particle Size Reduction (PSR) and Energy Index—and evaluated their ability to discriminate 24 inbred maize lines differing in digestibility. Both the PSR Index and Energy Index effectively highlighted the variability in friability, which could vary by a factor of two regardless of index. These two friability indexes are based on two different milling technologies and therefore on different mechanical stresses inside the mills that could both inform on friability, but on different scales. In order to interpret the observed differences, we characterized the biomass at different scales, from phenotypic observation of the shoot to physical properties of the chopped maize, down to cell wall amount and composition. The friability assessed through these two indexes was mainly inter-correlated: the lower the milling energy, the more friable the fine particles produced. However, we also identified slight differences between the indexes that could be interpreted in relation to structural scale: while the Energy Index primarily informed friability at the cellular scale, the PSR Index also informed friability at the cell wall scale. This study provided key insight into the friability of maize forage and its relation to physical and fiber properties.

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“…A redução relativa ao tamanho encontrado após 10 horas de moagem foi de aproximadamente 18%. ParaRajaonarivony et al (2019), o fenômeno da aglomeração pode limitar a redução de tamanho e até criar partículas maiores através de um efeito de agrupamento.…”

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Atividades Científicas e Tecnológicas no Campo da Engenharia Mecânica

Dallamuta¹

2020

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Direitos para esta edição cedidos à Atena Editora pelos autores. Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. A Atena Editora não se responsabiliza por eventuais mudanças ocorridas nos endereços convencionais ou eletrônicos citados nesta obra. Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação.

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

Cited by 15 publications

References 32 publications

Properties of biomass powders resulting from the fine comminution of lignocellulosic feedstocks by three types of ball-mill set-up

Properties of biomass powders resulting from the fine comminution of lignocellulosic feedstocks by three types of ball-mill set-up

Friability of Maize Shoot (Zea mays L.) in Relation to Cell Wall Composition and Physical Properties

Atividades Científicas e Tecnológicas no Campo da Engenharia Mecânica

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