Time：2023.12.26Browse：1
Graphite is a transitional crystal between atomic crystals, metal crystals, and molecular crystals. In the crystal, covalent bonds are formed by sp2 hybridization between carbon atoms on the same layer. Each carbon atom is connected to three other carbon atoms, and six carbon atoms form a regular hexagonal ring on the same plane, extending to form a layered structure. Carbon atoms in the same plane each have one p orbital left, which overlaps with each other to form delocalized π - bonds. Electrons can freely move in the lattice and be excited, so graphite has a metallic luster and can conduct electricity and heat transfer. Due to the large distance between layers and the low bonding force (van der Waals force), each layer can slide, resulting in a lower density of graphite compared to diamond, a softer texture, and a smoother texture. [1]
The distance between each layer of graphite is 3.40 Å, which is combined by van der Waals forces. The layers belong to molecular crystals, and the distance between carbon atoms in the same layer is 1.42 Å. Due to the strong bonding between carbon atoms in the same plane layer, it is extremely difficult to break, so the melting point of graphite is also high and its chemical properties are stable. Due to its unique bonding method, it cannot be solely considered as a single crystal or polycrystalline material. It is now widely believed that graphite is a mixed crystal.
Graphite belongs to the hexagonal crystal system and has complete layered cleavage. The cleavage surface is mainly composed of molecular bonds and has weak attraction to molecules, so its natural floatability is very good.
2024-03-19The development of graphite mineral resources is of great significance for promoting economic and social development. However, how to achieve the balance of environmental protection in the development process is an urgent problem to be solved.
Floating is a commonly used and important mineral method. Graphite has good natural floating. Basically, all graphite can be purified by floating methods. In order to protect graphite scales, most of the graphite flotation uses multiple sections of processes. Graphite flotation collecting agents are generally used for kerosene, with a dosage of 100 to 200g/t. The foaming agent is generally used with pine or butad ether, and the amount is 50 to 250g/t.2023-02-08Graphite flotation method
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