Preserving Flake Size in an African Flake Graphite Ore Beneficiation Using a Modified Grinding and Pre-Screening Process

Qiu, Yangshuai; Zhang, Lingyan

doi:10.3390/min7070115

Cited by 21 publications

(10 citation statements)

References 17 publications

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“…Furthermore, the ball milling process used in Step 1 is commonly used for particle size reduction in natural graphite beneficiation. 30,31 As such, a graphite materials manufacturer may be able to implement the production of CVD-Si@Gr using already existing equipment and processes. By using an approach that utilizes processes that are already used in materials manufacturing, using only a few lowcost and sustainable reagents, using few processing steps, and utilizing all-dry green chemistry; CVD-Si@Gr may be a drop-in solution both for materials manufacturers and for battery makers.…”

Section: Resultsmentioning

confidence: 99%

Nano-Si Filled Graphite Anode Particles by Mechanofusion

Jiang,

Salehabadi,

Yasmin

et al. 2023

J. Electrochem. Soc.

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Silicon-graphite composite anode materials for Li-ion cells were synthesized by embedding nano-Si into voids within natural graphite by mechanofusion, followed by carbon coating by chemical vapor deposition. In the resulting structure, voids within the natural graphite were completely filled with silicon nanoparticles encapsulated in carbon. This resulted in the silicon being protected from reaction with the electrolyte. The as-prepared silicon-graphite composites were shown to cycle well in electrodes with no special binders (PVDF) and in conventional electrolytes without any additives (i.e. no fluoroethylene carbonate). Furthermore, nearly all the Si within the voids were fully active. This provides a promising and simple strategy for silicon-graphite composites that can be used as a drop-in replacement for graphite to increase Li-ion cell capacity.

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Section: Resultsmentioning

confidence: 99%

Nano-Si Filled Graphite Anode Particles by Mechanofusion

Jiang,

Salehabadi,

Yasmin

et al. 2023

J. Electrochem. Soc.

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“…A preliminary analysis of the spectrum indicates that the principal bulk crystalline material is quartz, which gives rise to the most intense peaks at about 26 and 21 deg. , Unfortunately, the signals related to quartz cover those of carbon materials, so that graphite or fullerenes phases main signals are barely observable. The peaks visible at 37 and 46 deg can be attributed to silico-alluminates and iron silicide, respectively .…”

Section: Resultsmentioning

confidence: 99%

Shungite Carbon as Unexpected Natural Source of Few-Layer Graphene Platelets in a Low Oxidation State

Tamburri¹,

Carcione²,

Politi³

et al. 2018

Inorg. Chem.

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The paper reports on the feasibility of obtaining graphene nanomaterials with remarkable structural and chemical features from shungite rocks. The investigation of the composition and structural modifications induced in the pristine, natural C-containing mineraloid by a specifically designed physicochemical purification treatment is performed by a combined use of several techniques (scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction, Raman and X-ray photoelectron spectroscopies). The adopted material processing enables efficient extraction of the C phase in the form of thin polycrystalline platelets of a few hundred nanometers sizes, and formed by 6-10 graphene sheets. About 80% of such nanostructures are characterized by a regular sp C honeycomb lattice and an ordered stacking of graphene layers with a d-spacing of ∼0.34 nm. The low oxygen content (∼5%), mainly found in the form of hydroxyl functional groups, provides the graphene platelets (GP) with a chemistry strictly close to that of conventional rGO materials. Such a feature is supported by the high conductivity value of 1.041 × 10 S cm found for pelletized GP, which can be considered a valuable active material for a wide spectrum of advanced applications.

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“…(Long et al, 2013;Mu et al, 2020a;Mu et al, 2020b). Sun et al (2017) proposed an approach of steel rod coarse grinding and pebble regrinding, which effectively reduced the destruction of graphite flakes and improved the grinding efficiency. In addition, a prescreening process was applied to significantly improve the content of large flakes in the final concentrate.…”

Section: Introductionmentioning

confidence: 99%

Innovative correlation relating the destruction of graphite flakes to the morphology characteristics of minerals

Wang,

Xu,

Jiang

et al. 2024

Physicochem. Probl. Miner. Process.

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The morphology characteristics (sphericity, roundness, and surface roughness) affecting the destruction of gangue minerals on graphite flakes during the grinding process were systematically analyzed. Coupled with MS and SEM, sphericity analysis showed that graphite was flaky, which was similar to muscovite but different from granulous quartz and albite, and the roundness of the four minerals from high to low was graphite, quartz, albite, and muscovite. AFM analysis showed that the surface roughness of graphite and muscovite was very low compared to that of quartz and albite (higher than quartz). The size and crystal integrity of graphite flakes were both destroyed by gangues during the grinding process, and the destruction of quartz and albite was serious compared to that of muscovite. Sphericity dominantly affected the destruction: the larger the sphericity, the more serious the destruction, which was also negatively related to roundness but positively related to surface roughness.

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Preserving Flake Size in an African Flake Graphite Ore Beneficiation Using a Modified Grinding and Pre-Screening Process

Cited by 21 publications

References 17 publications

Nano-Si Filled Graphite Anode Particles by Mechanofusion

Nano-Si Filled Graphite Anode Particles by Mechanofusion

Shungite Carbon as Unexpected Natural Source of Few-Layer Graphene Platelets in a Low Oxidation State

Innovative correlation relating the destruction of graphite flakes to the morphology characteristics of minerals

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