Natural Graphite Powder
We are leading manufacturer of Natural Graphite Powder
Graphite powder comes in natural and synthetic form. Natural graphite powder is one of the purest and most crystalline forms of carbon. Synthetic graphite powders are made of carbon precursors (such as natural coals or petroleum coke) through a high-temperature electrochemical process. Both synthetic and natural graphite powders compete in final applications such as batteries, carbon brushes, brake pads, lubricants, sheets, refractories and steel recarburators.
Natural graphite powders are produced mainly in China, which has a 70% share in total world production, followed by Latin America with 20%. The production in Europe of natural graphite powders is less than 1%. While Europe has a very strong participation in the production of synthetic graphite: around 35% of the total world production.
Classification of Natural graphite powders:
Natural graphite powders are extracted and presented in 3 different forms: vein, amorphous (actually microcrystalline) and scales.
Vein Graphite: Crystalline vein graphite is the purest type of graphite, with the highest level of crystallinity of natural forms. It is found in fissures, fractures or cavities that cross igneous and metamorphic rocks through the pyrolysis of gases containing carbon. It is also the rarest. Sri Lanka is the only place where the graphite of veins is commercially extracted.
Amorphous Graphite: Amorphous graphite is formed by the thermal metamorphism of coal seams, its carbon content depends on the original material. Amorphous graphite is generally lower in purity than other natural graffiti. It is the most abundant type of graphite.
Flake Graphite: It happens as isolated, flat and plate-shaped particles with hexagonal edges if they are not broken and when they break, the edges may be irregular or angular. It has a distinctive formation in the form of a plate or ‘scale’. Flaked graphite is subdivided into large, medium and fine sizes and is a less common form of natural graphite, and is of higher quality than amorphous graphite. It forms in metamorphic rocks or calcareous sedimentary rocks. The degree of graphite in flakes ranges between 10-12% Cg, and the purity varies from 85-95% of carbon after refining. The natural flake has the widest range of use and represents around 49% of the natural consumption of graphite. The main uses include brake linings, batteries and fuel cells. Flaked graphite can be sold for four times the price of amorphous graphite. China, Brazil and Canada are the largest producers of flake graphite.
The important uses of graphite are as follows:
- The main use of graphite is to make pencils of different hardness, mixing them with different proportions of clay. The weakly supported layers of carbon atoms in graphite slide easily on top of each other and are left on the paper as black marks.
- Due to its slippery nature, graphite is used as a dry lubricant in machine parts.
- Being resistant to chemicals and having a high melting point and also because it is a good conductor of heat, graphite is used to make crucibles.
- The presence of free electrons makes the graphite a good conductor of electricity and is used to make electrodes.
- Graphite has the ability to absorb fast-moving neutrons, therefore, it is used in nuclear reactors to control the speed of the nuclear fission reaction.
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