Natural Graphite
Natural graphite is a form of carbon that is found in nature and is characterized by its physical and chemical properties, such as its high thermal conductivity, lubricity, and electrical conductivity. It is formed over millions of years through the slow decay of organic materials, and can be extracted from mines and processed for use in a variety of industrial applications, including batteries, lubricants, and refractories.
Advantages Of Natural Graphite
High Thermal Conductivity: Natural graphite is an excellent thermal conductor due to its high thermal conductivity properties. This makes it a preferred material in a wide range of applications requiring heat dissipation.
Low Electrical Resistivity: Graphite has very low electrical resistivity and is an excellent electrical conductor. This makes it an excellent choice in applications requiring electrical conductivity such as electrical contacts and electrodes.
Chemical Stability: Natural graphite is resistant to most chemical reactions and is immune to attack by acids and alkalis. This makes it an excellent choice in chemical processing applications.
Lubricity: Natural graphite exhibits good lubricity and is an excellent dry lubricant. It is used in a wide range of applications as a coating material including engine parts, molds, and bearings.
Low Friction: Natural graphite has a low coefficient of friction which makes it ideal for use in applications where low friction is desired, such as in the construction of brakes and clutches.
Thermal Stability: Graphite can maintain its properties at high temperatures, making it a perfect material for use in high-temperature applications, such as refractories and industrial heating elements.
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Types of Natural Graphite
Amorphous Graphite
Amorphous graphite is the least graphitic of the three main types. It forms when carbonaceous material undergoes low-grade metamorphism, meaning that the original material was not heated to a high enough temperature for long enough to form crystals. Amorphous graphite is typically found as small, dark particles in sedimentary rocks like coal and shale.
Flake Graphite
Flake graphite forms when carbonaceous material is subjected to high-grade metamorphism. This type of graphite has a higher carbon content than amorphous graphite and typically forms in flakes or plates. The size, shape, and purity of the flakes vary depending on the conditions under which the original material was metamorphosed.
Vein Graphite
Vein graphite, also known as lump graphite, is believed to have hydrothermal origins. It occurs in fissures or fractures and appears as massive platy intergrowths of fibrous or needle-like crystalline aggregates. The size, shape, and purity of vein graphite vary depending on the conditions under which the original material was metamorphosed. Compared to flake and amorphous graphite, vein graphite has a higher carbon content and is the most desirable type of graphite.
What Is Natural Graphite Used For
Natural Graphite Is Mainly Used In Refractories, Batteries, Steelmaking, Expanded Graphite, Brake Pads, Casting Surfaces And Lubricants.
Refractory Material
The use of graphite as a refractory (heat-resistant) material began before 1900 as a graphite crucible for holding molten metal; this is a small part of today's refractories. In the mid-1980s, carbon-magnesia bricks became important, followed by alumina-graphite shapes. As of 2017, the order of importance is alumina-graphite profiles, carbon-magnesite bricks, Monolithics (gunning and tamping mixtures), and then crucibles.
The crucible begins to use very large flake graphite, while carbon-magnesia bricks do not need that large flake graphite; for these and other aspects, the sheet size required is now more flexible, and amorphous graphite is no longer limited to low-end refractories. Alumina-graphite profiles are used as continuous castings, such as nozzles and grooves, to transport molten steel from the ladle to the mold, and magnesia bricks are arranged in converters and electric arc furnaces to withstand extreme temperatures. Graphite blocks are also used in blast furnace lining components, in which the high thermal conductivity of graphite is very important to ensure the full cooling of the furnace bottom and furnace. High purity monoliths are usually used as continuous lining rather than carbon-magnesia bricks.
Battery
The use of graphite in batteries has increased since the 1970s. Natural and synthetic graphite are used as anode materials for the construction of electrodes in major battery technologies.
Demand for batteries, mainly Ni-MH and Li-ion batteries, led to an increase in demand for graphite in the late 1980s and early 1990s-an increase driven by portable electronic devices, such as portable CD players and power tools. Laptops, mobile phones, tablets and smartphones have increased the demand for batteries. Electric vehicle batteries are expected to increase demand for graphite. For example, the lithium-ion battery in the all-electric Nissan leaf contains nearly 40 kilograms of graphite.
Radioactive graphite from old nuclear reactors is being studied as fuel. Nuclear diamond batteries have the potential to provide long-term energy for electronic products and the Internet of things.
Steelmaking
The natural graphite in steelmaking is mainly used to increase the carbon content in molten steel; it can also be used to lubricate dies used for extruding hot steel. Carbon additives face competitive prices from alternatives such as synthetic graphite powder, petroleum coke and other forms of carbon. A carburizer is added to increase the carbon content of the steel to a specified level.
Brake Pads
Natural amorphous and fine flake graphite is used for brake linings or brake shoes of heavier (non-automotive) vehicles and becomes important as an alternative to asbestos is needed. This use has been important for a long time, but non-asbestos organic (NAO) components began to reduce the market share of graphite.
Casting Surface And Lubricant
The mold cleaning solution for casting is a kind of waterborne amorphous or fine flake graphite coating. Use it to paint the inside of the mold and let it dry, leaving a fine graphite coating to ease the separation of the casting after the hot metal cools. Graphite lubricant is a special product used at very high or very low temperatures. It is used as forging die lubricant, anti-jamming agent, gear lubricant for mining machinery and lubricating locks. There is a great need for low-grained graphite or even better non-grained graphite (ultra-high purity). It can be used as dry powder in water or oil, or as colloidal graphite (permanent suspension in liquid). The metal can also be impregnated into graphite to form a self-lubricating alloy for applications in extreme conditions, such as machine bearings exposed to high or low temperatures.
The Difference Between Artificial Graphite And Natural Graphite
The development of natural graphite crystal is more perfect, and the graphitization degree of scale graphite is more than 98%, while the graphitization degree of natural microcrystalline graphite is usually less than 93%.
The development degree of artificial graphite crystals depends on the raw material and the heat treatment temperature. In general, the higher the heat treatment temperature, the higher the degree of graphitization. At present, the graphitization degree of artificial graphite produced by industry is usually less than 90%.
Natural scale graphite is a single crystal with simple tissue structure, only crystallographic defects and macro anisotropy. The grains of natural microcrystalline graphite are small, and the grains are disordered and have holes after impurity removal, which are isotropic macroscopically.
Artificial graphite can be regarded as a multiphase material, including the graphite phase transformed by carbon particles such as petroleum coke or asphalt coke, the coal asphalt binder, particles accumulation or pores formed by coal asphalt binder after heat treatment; natural graphite usually exists in the form of powder and can be used alone, but usually combined with other materials. There are many forms of artificial graphite, both powder, fibrous and block, while the narrow artificial graphite is usually block, which needs to be processed into a certain shape when used.
How Is Natural Graphite Produced
Natural graphite is transformed from carbon in rock, coal and molten deposits. The main method of producing natural graphite is through volcanic and magmatic activity inside the earth, which converts celestite and lignite in rocks and coal into graphite under high temperature and pressure. During this process, high temperatures and pressures cause graphite crystals to gradually form, which are then deposited in rock or coal.
Extracting natural graphite is also a complex process. Initially, graphite was found through geological exploration and prospecting. Workers would drill into rock or coal and use blasting tools to expose graphite crystals. Next, workers separate the graphite crystals from the coal or rock, then crush and screen them into particles ranging from a few millimeters to several centimeters.
Natural graphite needs to be further processed and refined for various industrial and manufacturing uses. Processing includes grinding, screening, soaking, washing, concentration and filtration. During these processes, graphite is separated and purified to remove impurities and impurities from it. After a series of processing and processing, natural graphite is made into products of different shapes and sizes, such as flakes, powders, blocks and rods, etc., which can be used to make pencil leads, coatings, batteries, ceramics, graphene and other products.
Methods For Improving Anode Performance Of Natural Graphite
Spherification
Flake natural graphite is anisotropic and the interlayer spacing is small, and these shortcomings can be improved by spheroidization. The spheroidization process is actually equivalent to the granulation process of flake natural graphite. The flake graphite collides, breaks, and curls under the impact of airflow to form a core, and the fine scales with smaller particle sizes adhere to the surface of the core to form spherical graphite. At present, in the graphite industry, the particle size of spherical graphite is mostly controlled at 8-23μm.
An excessively small particle size leads to an excessively large specific surface area, causing excessive side reactions in the formation process of the anode material, excessive consumption of lithium ions, and reduced initial charge and discharge efficiency. Conversely, if the particle size is too large, the contact area between the graphite particles and the electrolyte is small and the lithium ion diffusion distance is too large, which will affect its specific capacity.
However, flake graphite will produce certain pores during the spheroidization process, which affects the cycle life and rate performance of the anode material to a certain extent. On the other hand, the curling, folding and tight stacking of graphite flakes inside spherical graphite will cause a certain degree of stress concentration inside, which will intensify the dissociation and shedding of graphite flakes to a certain extent, thus causing abnormal lithium storage phenomenon. At present, the quality of spherical graphite is mainly judged by physical indicators such as tap density, particle size distribution, and specific surface area.
Coating
Spherification alone is not enough, because after spheroidization, the flake edges of flake natural graphite are directly exposed on the surface of spherical graphite, thus affecting the stability of anode materials. Therefore, it is also necessary to coat a modified layer of amorphous carbon material or metal and its oxide on the surface of spherical graphite to improve the compactness and stability of the solid electrolyte interfacial film (SEI).
At present, the cladding material is generally asphalt. Bitumen is a mixture of complex components, with different components, toluene insolubles and quinoline insolubles content. The softening point, carbon residue rate, and microstructure of the coating layer after carbonization are quite different, which has a great influence on the cycle performance. In addition, resin materials, sodium maleate, aluminum oxide, etc. can be used as coating materials.
Due to the large spacing between amorphous carbon layers and the relatively easy diffusion of lithium ions, this is equivalent to building a buffer layer for lithium ion diffusion on the surface of spherical graphite. After spheroidization and coating modification, the specific capacity, first cycle efficiency and cycle performance of the natural graphite anode material have been significantly improved. At this stage, it is mainly used in the field of 3C digital and small power electronic products.
Others
At present, increasing the rapid migration channel of lithium ions by constructing a pore structure on the graphite surface is also one of the effective means to improve the rate performance of natural graphite. In addition, micro-expansion treatment is another common method to improve the rate performance of natural graphite, which reduces the diffusion resistance of lithium ions by regulating the interlayer spacing of graphite. At present, the most common process of micro-expansion treatment is chemical oxidation. In addition to the process, the selection of reagents and the optimization of operating process conditions are also one of the important directions to improve the rate performance of anode materials.
How Is Natural Graphite Mined
Natural Graphite Mining Is Mainly Divided Into Two Methods: Open-Pit Mining And Underground Mining.
Open-pit mining mainly refers to mining where graphite deposits are exposed on the surface. The graphite ore is usually shaken down by blasting, and then loaded and transported using a loader. Finally, the concentrate is obtained after crushing, grinding and other processes.
Underground mining refers to excavating graphite deposits through underground excavation methods. Underground mining is divided into two methods: longwall working method and room-and-pillar working method. The longwall working method uses a long strip mining method, and the room-and-pillar working method uses a method of alternating rooms and pillars for mining. In underground mining, mining machinery and equipment, such as tunnel boring machines, rotary scrapers, etc., are usually required for excavation and transportation.
What Is The Future Prospect Of Natural Graphite
Natural graphite has good electrical conductivity, thermal conductivity and chemical stability. It is an important industrial material and has broad application prospects. Here are the future prospects for natural graphite
Lithium-Ion Batteries
Natural graphite is currently the main anode material for lithium-ion batteries. In the future, with the increase in market demand for electric vehicles and energy storage systems, the lithium-ion battery market will continue to expand, and the demand for natural graphite will also continue to grow.
New Energy
Natural graphite is widely used in new energy fields such as solar cells, fuel cells and supercapacitors. The future development of these fields will also provide more development opportunities for natural graphite.
High-Performance Coatings
Natural graphite can be used to produce high-performance coatings. In the future, with the continuous expansion of the coatings market and the improvement of product performance requirements, the market demand for natural graphite will also increase.
Aerospace
Natural graphite is widely used in the aerospace field. With the development of the aerospace market in the future, the application prospects of natural graphite will continue to expand.
What Factors Should Be Considered When Choosing Natural Graphite
When Choosing Natural Graphite, You Should Consider The Following Factors
Purity: Graphite products on the market may contain impurities, which affects their effectiveness and quality. High purity graphite can provide better performance and longer.
Structure: The crystal structure of graphite will directly affect its properties, such as conductivity, wear resistance, etc. Choosing the right structure can improve the practicality and stability of the product.
Quality: The quality of natural graphite is the main factor affecting its value. High-quality graphite has a high degree of purity and uniform particle size, and is not affected by impurities.
Form: Graphite can appear in different forms, such as powder, pellets, blocks, etc. Choosing the appropriate form according to actual needs can facilitate production and application.
Application fields: Different fields have different requirements for graphite, such as batteries, lithium batteries, solar cells, pressure vessels, electromagnetic heating, etc. Choosing the right graphite ensures optimal product performance in the application.
Price: Price is also one of the factors to consider when choosing graphite. On the premise of ensuring product quality, choosing the right price can reduce production costs and improve economic benefits.
What are the properties of natural graphite
Natural graphite is a unique form of carbon with a variety of properties. The following are important properties of natural graphite:
High Thermal And Electrical Conductivity
Natural graphite possesses exceptional thermal and electrical conductivity, making it an ideal material for applications in the electronics and energy industries. Graphite is commonly used as a conductive filler in products, such as batteries and fuel cells, that require efficient energy transfer.
Lubrication
Graphite has long been prized for its natural lubricating properties, which make it ideal for use in mechanical and industrial applications where friction reduction is crucial. Graphite-based lubricants are widely used in manufacturing plants, machinery, and heavy equipment.
High Melting Point
Graphite has a high melting point of 3700°C, making it ideal for applications involving high heat and pressure, such as metallurgy and high-temperature furnaces.
Chemical Resistance
Natural graphite is highly resistant to chemical reactions, which makes it an ideal material for use in chemical processing plants and laboratories. It can be used for its resistance to acids, bases and organic solvents.
High Strength And Stiffness
Natural graphite's unique structure of interlocking carbon flakes gives it excellent strength and stiffness characteristics. As a result, it is a common material used to reinforce composites, such as carbon fiber reinforced plastics.
Lightweight
Graphite is extremely lightweight, with a density of 2.26-2.28 g/cm3. This property makes it an attractive material for lightweight structural components and applications where weight is a critical factor.
Natural graphite is well known for its excellent lubrication properties due to its unique crystalline structure and physical properties. Graphite consists of layers of carbon atoms arranged in hexagonal lattice structures. These layers are weakly bound together by van der Waals forces and can easily slide over each other, making it an ideal lubricant.
Graphite’s lamellar structure allows it to adhere easily to metallic surfaces, providing a low-friction interface between them. The layers of graphite can quickly slip and slide over the metal surfaces without sticking or generating frictional heat, reducing mechanical wear and tear. Graphite also has excellent thermal and chemical stability, making it an ideal lubricant under extreme temperature and pressure conditions.
Another reason why natural graphite is a good lubricant is because of its self-lubricating properties. When graphite is rubbed against a surface, it transfers small amounts of graphite particles onto that surface, reducing friction and producing a thin, uniform layer of lubrication. This layer of lubrication is self-replenishing, ensuring long-lasting and effective lubrication.
Graphite is also an excellent conductor of electricity, which makes it a suitable lubricant for electrical conductors. It has the added advantage of reducing wear between electrical contacts and preventing arcing and sparking, which can contribute to machine failure.
Natural graphite is a crystalline form of the element carbon with a layered structure. It is formed by the accumulation of organic matter under high pressure and temperature for millions of years. The chemical composition of natural graphite is nearly pure carbon with small amounts of impurities, which are usually metallic elements that were present when the graphite was formed.
Natural graphite consists of hexagonal layers of graphite sheets, also known as graphene layers, stacked on top of each other. Each layer is made up of carbon atoms that are bonded together in a hexagonal lattice. The bonding between the carbon atoms within each graphene sheet is covalent and strong, and the three-dimensional structure of the graphite is held together by weak Van der Waals forces.
The typical chemical composition of natural graphite is 90-99% carbon, with the remaining 1-10% consisting of impurities such as sulfur, iron, aluminum, silicon, and other trace elements. The structure, purity, and properties of natural graphite can vary depending on the location of the source and the geological conditions under which it was formed.
Natural graphite is used in various industrial applications due to its unique properties, including high thermal and electrical conductivity, low friction, and high tensile strength. It is commonly used to make lubricants, crucibles, brake linings, batteries, electrodes, and in the production of graphene and various carbon-based products.
Our Factory
Anyang Jiashike Metal Co.,LTD,as the leading manufacturer of ferroalloy materials in .It is a comprehensive enterprise integrating scientific research, processing and production, and import and export trade.It has more than 20 years of experience in the professional field and uses advanced technology and professional equipment. , produces high-quality metals and alloys, and its business scope involves metallic silicon, ferrosilicon, silicon-calcium alloy, silicon-carbon alloy, natural graphite powder and other products.
FAQ
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