Graphite is a vital non-metallic mineral resource and carbon allotrope characterized by its black-gray appearance, soft texture, lubricating properties, chemical stability, and corrosion resistance against acids and alkalis.

Crystalline graphite exhibits excellent natural flotability, making flotation the primary beneficiation method. Since flake size determines quality, multi-stage grinding and separation processes are employed to extract large graphite flakes early in the process.

Cryptocrystalline (microcrystalline) graphite features extremely small crystal structures embedded in clay, resulting in poor floatability. With raw ore typically containing 60-80% carbon content, many operations utilize direct crushing, manual separation, and grinding for final product preparation.

The comprehensive graphite beneficiation process includes: raw ore → crushing (coarse & fine) → grinding → flotation → dehydration & drying → classification → packaging.

Graphite ore typically has medium-hard to soft hardness with 2-10% original grade. Crushing configurations include three-stage open-circuit, two-stage open-circuit, or single-stage processes. Weathered ore from small-scale operations may proceed directly to grinding.

Flotation employs closed-circuit multi-stage grinding and separation with sequential or concentrated middlings return. Three regrinding approaches are utilized: concentrate regrind, middlings regrind, and tailings regrind.

Crystalline graphite typically uses concentrate regrinding, achieving approximately 80% recovery rates. Middlings regrinding shows limited effectiveness, while open-circuit processes yield only 40-50% recovery due to excessive tailings loss.

Drying equipment elevates to specific temperatures for efficient moisture removal. Continuous rotation ensures uniform heat exchange and optimal dryness throughout the graphite material.

Low-density flotation slurry with minimal solid content enables superior classification. Graphite becomes depleted in sedimentation while enriching in overflow, significantly improving regrinding efficiency and selection performance.

Multiple grinding stages generate substantial middlings containing valuable graphite content. Processing methods include centralized return, sequential return, individual processing, and combined multi-processing approaches to maximize resource utilization and recovery rates.