Process Introduction:
The graphite beneficiation process includes flotation, and gravity separation. Because the surface of graphite is not easy to be wetted by water, it has good buoyancy, and it is easy to separate it from impurity minerals.
The graphite flotation process is widely used, mainly including multi-stage grinding, gravity-flotation combined process, and selection of mineral processing equipment.
Graphite ore is divided into earthy graphite ore and flake graphite ore. Natural flake graphite collected from natural mines often contains a lot of impurities, and graphite ore with higher carbon content needs to be processed through mineral processing.
The general graphite mining process flow includes crushing – screening – grinding – flotation – dehydration – drying – grinding – grading, and packaging.
1. Preparatory process (crushing, screening, and grinding)
Since the hardness of graphite ore is generally medium-hard or medium-hard to soft, and the grade is generally between 2% and 10%, the crushing usually adopts three-stage open circuit, two-stage open circuit or one-stage crushing process. Ensure that the graphite flakes are not damaged, and ensure that the quality of the concentrate meets the requirements.
Commonly used coarse crushing jaw crusher, medium and fine crushing cone crusher, or hammer crusher. Screening uses a vibrating screen. Graphite milling machines adopts ball mill and spiral classifier.
2. Flotation process (rough selection, sweeping and selection)
For graphite ore with heavy minerals, the combined process of gravity separation and flotation machine can be used for separation. It is mainly flotation process: it adopts a closed-circuit process of multi-stage grinding, multi-stage sorting, middle ore sequence or centralized return.
There are three forms of multi-stage re-grinding and re-separation: concentrate regrinding, middling ore regrinding and tailings regrinding. Choose a reasonable middling treatment method according to the specific beneficiation process design.
3. Concentrate treatment (dehydration, drying, screening, packaging)
Dewatering screens, filter press or rotary dryers are commonly used for the dehydration of graphite ore concentrates.
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