Tag: graphite

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Six classifications and applications of graphite

Graphite is classified into six categories and has many applications.
Graphite is abundant in my country, and it's widely distributed. However, many of the small and medium-sized mineral resources are found there. Private small graphite miners have operated in my country, and graphite products are of low added value. After many years of hard work, my country has invested in a large amount of money and technical and scientific personnel. The graphite reserves of my country have been used more efficiently after the reorganization and improvement of the graphite use. Graphite has been developed in my country as high-purity graphite.
1. High purity graphite
High-purity Graphite (carbon contents > 99.99%) can be used to stabilize military industrial pyrotechnics materials, advanced refractory material in the metallurgical sector, Chemical fertilizer catalysts, additives etc.
2. Isostatic Graphite
The graphite used to make isostatic graphite comes from high-purity material. It has a low coefficient of thermal expansion, good heat resistance and chemical resistance. In the past fifty years, isostatic graphite has become a world-first product. It has not only achieved great success in civil applications, but also holds a prominent position in cutting-edge national defense. This is a brand new material, which is also eye-catching. It is mainly used for the following aspects.
(1) Heater to heat polysilicon ingots
As a result of the global warming, the awareness among humans to protect the Earth has increased. More and more people now prefer natural energy that does not emit carbon dioxide. In this trend, solar cell technology has become a "darling" in the new age. The ingot heater that is used during the manufacturing process must be made out of graphite.
Nuclear fission (high temperature gas-cooled) reactor
In order to meet the requirements of graphite as a moderator for high-temperature nuclear reactors that use gas cooling, it must be resistant to deformation and radiation stress. Therefore, a modular high temperature gas cooled reactor has been proposed. Modern ultra-high temperature reactors are characterized by high power density at high temperature. This raises the bar for new graphite materials. They must be of good quality, low cost, have a high radiation damage tolerance and homogenize the product.
Nuclear fusion reactor.
Graphite's special properties also play an important role in nuclear fusion. It can greatly reduce the metal particles in the material's plasma, and therefore plays an important role in improving energy confinement. As nuclear fusion devices expand, graphite wall materials that have high mechanical and thermal strength are the best choice for the first material to face the plasma. These materials also show a good discharge pulsation effect. Because graphite is low in atomic numbers and has low radiation losses, it can be mixed with plasma to keep it stable.
(4) Electric discharge machining electrode.
In the electrodes for electric discharge machining, graphite electrodes offer many advantages. Although graphite is a good material, it has some drawbacks. For example, dust and wear can occur during cutting.
3. Expandable graphite
Also known as acidified or flake graphite. It is made from high-quality graphite. Expanded Graphite offers many advantages, such as high-temperature resistance, high-pressure resistance, good seal performance, and corrosion resistance for various media. It is a type of advanced seal material. It is mainly applied in the following areas.

(1) Environmental protection as a field.
The hydrophobicity and lipophilicity of expanded graphite allows it to selectively remove nonaqueous solutions in water. This feature is commonly used to remove slicks of oil from the sea surface. A large amount of oil can be absorbed by this product due to its molecular composition. It can be aggregated in blocks and float on water. After oil removal, it can also be recycled or reused. Expanded graphite, in addition to its selective adsorption, has an inhibitory impact on air pollution. This includes the adsorption and removal of carbon dioxide.
Sealing Material
The flexible graphite made of expanded graphite is used to seal materials.
4. Graphite fluoride
Graphite fluoride, a high-tech material with high-performance and high-efficiency, is currently being researched around the globe. It has excellent quality and performance, and is widely used as a functional material.

(1) It is used as a releaser.
Graphite-fluoride has a low surface energy, which makes it a good release agent for metal moulds.
Solid lubricants.
Fluorinated Graphite, with its low interlayer energy and low surface energy as well as good chemical and thermal properties, has outstanding lubricating characteristics and is ideal for harsh conditions like high temperature, pressure, corrosive materials and high load.
Batteries Raw Materials
It is very difficult to use fluorine in the active material of batteries that contain fluorine-lithium, because fluorine gas can be poisonous. Fluorinated Graphite is used for its excellent electrochemical properties when mixed with organic electrolytes. This makes it a popular material in the integrated circuit memory of cameras, computers and watches.
5. Colloidal graphite
One of the main features of colloidal graphite is its lubricity. The colloidal film of graphite has an excellent thermal insulation in the vertical direction. It is used widely in turbine propellers and hot steam cylinders. It is used to reduce static electricity in the electronics industry.
6. Graphene
Graphene has a hexagonal honeycomb-like lattice made of carbon atoms, and sp2 hybrid orbitals. This is a two-dimensional, one-atom thick material. It is the most durable and hard nanomaterial ever found.
The special arrangement of its atomic structure has made it widely used.
(1) According to ultra-thin Graphene (single layer graphene almost transparent; its molecules are tightly packed, so that even the smallest of helium atoms can't pass through), the strength is super strong, and it can be used in ultra-light armors, ultra thin and ultra light aircrafts, etc. .
(2) Its conductive atoms have a much higher speed than electrons that move in metal conductors. It can be made into graphene conductor agent.
The rapid movement electrons of this material, which is conductive, allows for its use in the future as a replacement for silicon, such as in curved mobiles, photon sensors, and supercomputers.
Researchers have found that bacteria cannot grow on graphene but human cells do not get damaged. Take advantage of it; graphene is great for bandages, packaging food, etc.

Tech Co., Ltd. is a professional manufacturer of graphite with more than 12 years' experience in research and development for chemical products. You can contact us to send an inquiry if you need high-quality graphite.

2023-08-08

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Quality Index of Graphite Electrode

Graphite electrodes are used in the EAF steelmaking process to melt scrap metal. Graphite is used because it can handle high temperatures. In an electric furnace, the electrode tip can reach 3,000° Fahrenheit. That is half the temperature of the surface of the sun. The diameter of the electrode can vary from 75 mm up to 750 mm. Its maximum length is 2800 mm. The main indicators that determine the quality of graphite are bulk density, electrical resistance, bending strength and elastic modulus. According to the indicators of graphite and the differences between national standards, manufacturing processes and raw materials used in graphite electrodes, graphite can be divided into ordinary power electrodes(RP), high power electrodes(HP), and ultrahigh power electrodes(UHP). In order to meet the needs of various users, the production line for post-graphite electrodes can also add high-density and quasi super-high graphite (SHP) electrodes.
Each company sets its own corporate standard based upon national standards. Customers will then set their own quality standards. The relative density of volume is the ratio of quality control of the graphite sample to its volume. The unit is grams per cubic centimeter. The higher the volume density the denser and stronger the electrode. This is directly related to the performance and strength of the anti-oxidation systems. In general, the higher the volume density, the lower is the resistance of an electrode.
It is used as a parameter to measure the conductivity of electrodes. It is the resistance that the conductor has to current flowing through it. The value equals the resistance of a conductor of length 1m with a cross sectional area of 1m2 when heated to a certain temperature. This reduces consumption.
The flexural force is a parameter which characterizes performance of mechanical system in graphite material. This is also known as the flexural resistance. This means that the object will bend up to its instantaneous limit to resist risk when the external force perpendicularly crosses the axis. Capacity is measured in MPa. The network is less likely to be damaged by electrodes or joints with high strength.
The modulus of elastic is a key aspect of mechanical properties. It is a measure of the elastic deformation capacity of a substance and refers the stress-strain relationship within the elastic deformation spectrum. The greater modulus, and therefore the greater stress, is required to cause elastic deformation. Simply put, the greater modulus, the more elastic the material.
The thermal coefficient of graphite used as an electrode can be a critical parameter for thermal performance. The higher the value of the coefficient, the better the thermal stability. The greater the resistance to oxidation, the better the performance, and the lower the fracture and consumption.
Ash can refer to solids other than carbon graphite. Graphite's ash content is directly influenced by the raw material ash. The ash level of petroleum coke and needle coke are low. As a result, the ash of graphite passed through the electrode has a maximum ash concentration of 0.5%. Ash levels within 1% have no impact on steelmaking. The ash contains impurities that will affect the performance of anti-oxidation systems of the electrodes, etc.
(aka. Technology Co. Ltd., a trusted global chemical supplier and manufacturer with more than 12 years of experience in the production of super-high-quality chemicals and nanomaterials. Our company produces graphite with high purity, small particles and low impurity levels. If you require a lower grade, please do not hesitate to contact us.

2023-08-06

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Graphite is One of the Most Versatile Non-Metallic Materials in the World

Graphite, while as hard as a diamond, is also lightweight, soft and heat resistant due to its unique structure. It is the world's most popular non-metallic material. Graphite, also known as Plumbago during ancient times, was a non-metallic mineral. It is an allotrope of carbon and a semi-metal. Graphite is most stable under standard conditions. In thermochemistry, graphite is used to determine the standard state for forming the heat in carbon compounds. Graphite can be considered as the highest grade coal. Anthracite and meta-bituminous are the next two grades, but they are not typically used for fuels because it's difficult to ignite.

Graphite Types and Features

The three types of graphite that are found in various deposits can be divided into:

Flake graphite

Flake graphite is a flat, hexagonal-edged plate. It can have irregular or angular edges if it does not break. It is found in metamorphic rock, like limestone, gneiss or schist. The crystals are either evenly distributed throughout the ore or concentrated in pockets.

This is an uncommon form of graphite
Carbon ranges from 85 to 98%.
There are four standard sizes: large, super large and fine
Graphite can be used for new technologies, including anode materials in lithium-ion batteries.

Amorphous graphite

The graphite in amorphous form is found in the mesomorphic layers of rocks such as slate, coal and shale. Carbon content is dependent on its parent material. It is found in coal as a result of the thermal metamorphism and is known as meta-anthracite. Because it is harder to burn than coal, it's not used for fuel.

This is the most abundant type of graphite
Low carbon content 70-80%
Lowest purity
Used in refractory brake pad, clutch materials, gaskets, and pencil lead.

Vein graphite (or lump graphite)

According to some scientists, vein graphite can be made from crude oils that are transformed into graphite by temperature and pressure. Riddle said that the veins "are very small, measuring between 5 to 10 centimeters" and are 70 to 100% pure. It's rare and expensive.
The only place where the mines are currently active is Sri Lanka
Limit the durability of most applications.

(aka. Technology Co. Ltd., a trusted global chemical supplier & manufacturer has been providing high-quality Nanomaterials and chemicals for over 12 Years. Our company produces graphite with high purity and low impurity levels. If you require a lower grade, please do not hesitate to contact us.

2023-08-05

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How Does the Heat-spreading Graphite Film Save an Over-heating Mobile Phone？

The heat dissipation problem of smart phones continues to be a major issue.
In general, thermal management for electronic products and smart phones depends on the use of micron-thick graphite sheets. Their excellent thermal conductivity allows them to neutralize heat produced by the surrounding components.

The production of micron-thick films with high quality is not an easy task. It is a complex process. The material must be able to resist temperatures of up to 3200degC (5792-degF) in order to create a thin film with a thickness around several Microns. The complex process of making graphite films from polymers, which are used as source materials, is energy intensive.

Recently, researchers from King Abdullah University of Science and Technology KAUST in Saudi Arabia developed a more efficient method of producing these graphite cooling device.

The research team used the technique of chemical vapor deposition to grow nanothick graphite film (NGF) onto nickel foil. This technique uses nickel to catalyze the conversion of methane gases into its surface. graphite. It is important to note that the graphite formed on the surface is only 100 micrometers thick.

The team refers to these films as nano-thick (NGFs), and they are made by heating the material up to about 900degC. In this process graphite film is formed on the foil's two sides, and can be grown into sheets of up to 55 square centimeters. These films are easily extracted and can be transferred to another surface.

Alessandro Genovese is an expert in transmission electron microscopy (TEM). The researchers collaborated with him to capture a TEM image of NGF on a nickel surface. The researchers stated that the ability to observe the interface of graphite and nickel foils is a breakthrough that will help clarify the growth mechanism for these films.

NGF is not only a better and cheaper solution for materials that will be used in future mobile phones for thermal management, but it can also be used in solar cells, or for detection. Sensor material used for NO2gas.

His research was published in "Nanotechnology", and "Science Reports".

(aka. Technology Co. Ltd., a trusted global chemical materials supplier and manufacturer has over 12 years experience in providing high-quality nanomaterials and chemicals. The powder that we produce is high-purity, with fine particles and low impurity levels. If you need lower, please contact our company.

2023-08-05

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What is Black Phosphorus Graphite Composite?

Black Phosphorus Graphite Composite is an innovative composite material made out of Black phosphorus (BP) and graphite. Due to its high conductivity (both electronic and ionic) and theoretical capacity, Black phosphorus makes a good anode material. It is important to understand the redox reactions that occur between BP and alkali-metal ions in order to determine the limitations and potential of BP. This will guide the development of composites based on BP for high-performance, alkali-metal-ion batteries.
Scientists from the University of Science and Technology of China's Professor Ji Hengxing published a research result in "Science" a few weeks ago. They made a significant breakthrough in their research of lithium-ion electrode materials.
Ji Hengxing stated that "if we use this technology, we may be able fully charge an electrical car in around 10 minutes and travel about 500 kilometers." The charging time of electric cars has always been a major problem. Electric vehicles are currently "waiting" an hour before they can drive 500 km. The electric vehicle industry has always sought to create large-capacity, lithium-ion battery packs with fast charging capability.
The material of the electrode is an important factor when determining battery performance indicators. If you wish to increase battery charging speed you must use a material which has a quick electrochemical reaction. It is important to check if the electrode material can conduct electrons andions. Ji Hingxing, a member of the research group, said that they hope to find an electrode material capable of meeting the industry's expectations for comprehensive performance indicators and also adapting to the industrial production process.
Dr. Hongchang Jin was the first author to introduce the thesis. He said, "Energy enters or exits the batteries through the chemical reactions between lithium ions, and electrode materials. Determining the charging rate is based on the conductivity between the electrode materials and lithium ions. It is important to consider the amount."
The Jixingxing research team discovered that black phosphorus was a good choice. It has a very high theoretical capacity, only second to single-crystal lithium or metallic silicon. Second, because it is a semi-conductor, its ability to conduct electronic currents is strong. Thirdly, the layered structure of black phosphorus allows lithium ions to be easily transported between the layers. This excellent property makes black phosphorus an electrode material which can be used to fast charge lithium-ion batteries.
Black phosphorus (an allotrope to white phosphorus) is an excellent electrode material for fast charging. Nevertheless, current studies found that the performance indicators for black phosphorus are not as good as expected. Black phosphorus can be damaged by the edges of the layered structures, and its measured performance is lower than expected. Ji Xingxing adopted the "interface-engineering" strategy to connect graphite and black phosphorus through phosphorus carbon covalent bonds. This made the structure more stable and allowed lithium ions into the black phosphorus to be easier.

Additionally, the electrode material can be wrapped with chemicals that slowly decompose the elctrolyte as the process proceeds. Some substances will block lithium ions from reaching the electrode material in the same way that dust on glass surfaces prevents light penetration. To achieve this, the team of researchers applied clothing to the composite material. They made a dustproof coat using a thin layer of polymer gel and "wore" this on the surface the black graphite composite material. This allowed lithium ions to easily enter.
"Under the interface optimizing of these two layers, this black-phosphorous composite material achieved a breakthrough performance." Ji Hingxing told the media.

"We use traditional process routes and parameters to convert the black-phosphorous composite material to the electrode sheet. The laboratory measurements show that after 9 minutes, the electrode sheet recovers about 80% and after 2000 cycles it still retains 90%. Xin, the cofirst author of the article and a researcher from the Institute of Chemistry of Chinese Academy of Sciences said that if mass-production of this material is possible, matching cathode products and other auxiliary substances can be found, then the optimized design should achieve an energy density of 350 Wh. It has a lithium ion battery that can be charged quickly and is capable of delivering 350 Wh/Kg. The battery will enable electric vehicles with a range of up to 1,000 kilometers and increase their user experience.
Jixingxing will continue its exploration in the areas of basic research, scale preparation technology and other related fields. For battery technology to advance and for electric vehicles and consumer electronics to develop, it's important that we have a deep understanding of scientific fundamentals, including the microstructure of electrode materials and their physical and chemical properties. "We have a long way to go before we can achieve this vision. But, we're full of optimism for the future." Ji Hengxing spoke.
(aka. Technology Co. Ltd., a trusted global chemical supplier and manufacturer with more than 12 years of experience in providing high-quality Nanomaterials and chemicals. Our company produces graphite with high purity and low impurity levels. If you require a lower grade, please do not hesitate to contact us.

2023-08-04

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Modified Artificial Graphite: an Excellent Anode Material for Lithium Batteries

Graphite Graphite can be classified into artificial graphite Graphite or natural graphite. Although both graphite powders have similar properties in terms of physical and chemical structure, their applications are very different. Some researchers have not noticed the differences between the two, and called it graphite as a whole in several studies. This conflation has resulted in many errors of judgment and decision-making, which have led to a waste of resources and financial losses. This article discusses the structure, composition and performances of both natural and synthetic graphite.

Graphite powder: Classification and characteristics

Natural graphite is produced by transforming organic carbon under long-term geological conditions of high temperatures and high pressure. It is nature's crystallization. The crystal form of graphite determines the process characteristics. Minerals with a variety of crystal forms are used in different industries. There are several types of graphite powder. The industry divides graphite according to its crystalline form. My country has two main categories: flake graphite, and cryptocrystalline.

Crystallography uses polycrystals to describe the structure of graphite. Artificial graphite comes in many different forms, each with a unique production process. All graphite materials that are obtained through high-temperature graphitization and organic carbonization can be collectively termed artificial graphite. These include carbon (graphite), carbon fiber, foam graphite etc. Artificial graphite, in its narrowest sense, is the result of using carbonaceous raw material (petroleum, pitch, etc.). With low impurity contents as aggregates, coal pitches, etc. After batching, kneading molding and carbonization (industrially known as it is a block-solid material obtained through baking), and graphitization. Examples include graphite electrode, hot isostatic pressed graphite etc. Today, we will look at the uses and production processes of artificial graphite.

Artificial Graphite - Application and Production Process

Anode materials are one of the key components of lithium-ion battery, and they play a major role in energy efficiency and cycle stability. The development of science has led to the emergence of new negative electrodes materials. These materials include graphene and carbon nanotubes. They also come in silicon-based, tinbased, tungstenbased, etc. but their large quantity is limited due to different problems. At present, graphite carbon materials dominate the market for anode materials.

Artificial graphite is less crystallized, has a lower graphitization level (=93%) than natural graphite and a more disordered structure. Artificial graphite also has a surface that is not smooth and porous. It also has a high specific surface. It decomposes and reacts easily with the electrodelyte. Therefore, its initial efficiency (=350mAh/g), and specific capacity are low.

Researchers improved the production method to overcome the problem of artificial graphite, which is used in lithium-ion batteries. A modified artificial graphite product with low expansion and high compaction is a good example. The use of it as the positive electrode of a replacement lithium battery will improve its conversion to electrolyte and reduce the swelling of pole shoe. The process of production is to replace the artificial graphite by pitch, etc. The carbonization process is to replace the artificial graphite with pitch, etc. A layer of amorphous, carbon-doped material is formed over the surface. The overlapping layer prevents the co-embedding and expansion of organic solvents. The surface layer has been displaced so that the lithium batteries are interrupted. This maintains high capacity and low potential, as well as compatibility with solvents.

(aka. Technology Co. Ltd., a global chemical supplier & manufacturer that has over 12 years of experience in the production and supply of super high quality nano materials and chemicals. 99.99% modified artificial graphite manufactured by our company is of high quality, with fine particles and low impurities. If you need lower, please call us.

2023-08-03

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Graphite Properties, Applications and Optical features.

Like diamonds graphite is also a natural carbon crystal with hexagonal atoms in a deep red-to-black opaque structure. It is found as hexagonal crystalline, flexible sheets or large blocks. It can appear earthy, granular or compact. Graphite can be formed through the metamorphism or carbonaceous deposits, and by reacting carbon compounds with hydrothermal liquids. It occurs naturally in this state and is the stablest form of carbon when under standard conditions. Diamonds can be formed under high temperatures and pressure. It has a very different appearance than a real diamond and is on the opposite side of the hardness spectrum. Its flexibility comes from the way that the carbon atoms have been bonded together. Six carbon atoms form a plate with a horizontal spacing. The atoms in the ring are very strongly bound, but the bonds between the thin plate are weak. It is used to make pencils and for lubricants. Due to its high conductivity, it is useful in electronic products like batteries, solar cells, and electrodes.

Chemical Properties

Chemical Classification	Native element
Formula	C

Graphite Physical Properties

Color	Steel gray and black
Streak	Black
Luster	Metallic and sometimes earthy
Cleavage	Perfect in one direction
Diaphaneity	Opaque
Mohs hardness	One to two
Crystal System	Hexagonal
Tenacity	Flexible
Density	2.09 - 2.23 g/cm3 (Measured) 2.26 g/cm3 (Calculated)
Fracture	Micaceous

Graphite Optical properties

Anisotropism	Extreme
Color / Pleochroism	Strong
Signs	Uniaxial ()
Birefringence	extreme birefringence

The appearance and use of graphite
The reduction of carbon compounds causes the degradation of deposits containing carbon. The main component found in igneous stones. This occurs due to the reduction sedimentary carbon compound in metamorphic rock. Also, it can be found in meteorites and magmatic rocks. Quartz, calcite and mica are minerals that have a close relationship to this mineral. The main mineral exporters are China, Mexico Canada Brazil Madagascar.

Synthetic graphite
Synthetic graphite is made of graphitic (carbon) carbon. It is produced by CVD, at temperatures above 2500 K., either through the decomposition or supersaturation of carbides.

Synthetic graphite and "artificial graphite", both terms are often used interchangeably. Synthetic graphite is more preferred due to the fact that their crystals are believed to be composed of macromolecules of carbon. The term CVD is also used to describe carbide residues, pyrolytic and synthetic graphite. The definition is the same for this common usage. Acheson and electrophotography are two of the most important synonyms for synthesized graphite.

The Applied Area
Natural graphite has many uses, such as refractory, batteries and steelmaking. It is also used for brake pads, casting surfaces, expanded graphite or graphite.
The graphite used in crucibles was very large, but the graphite required for carbon-magnesite blocks was not as large. These and other products now have greater flexibility in the size of flake graphite required.
Graphite use in batteries has grown over the past 30 Years. In the major battery technologies, both natural and synthetic materials may be used for electrodes.
The lithium-ion batteries in the new electric cars contain nearly 40 kilograms each of graphite.
The main use of natural graphite for steelmaking is to increase carbon content in the molten steel. It can be used also to lubricate extrusion moulds.
The use of natural amorphous flake and fine flakes graphite for brake linings and brake shoes in heavy vehicles (non automotive) is increasing as asbestos needs to be replaced.
Foundries clean molds with amorphous, thin flake like coatings. If you paint it inside the mold then let it air dry, it will leave behind a fine graphite layer that helps to separate the castings after the molten steel has cooled.

Synthetic graphite has many uses
High focus pyrolytic (HOPG), the best synthetic graphite, is of the highest quality. In scientific research it is used to calibrate scanners and scanning probe microscopes.
The electrodes melt scrap steel and iron in electric arc kilns (most steel furnaces) and, sometimes, direct reduced iron. The mixture of coal tar and petroleum coke is used to make them.
Graphite Carbon electrodes are also employed in the electrolytic aluminium smelting. In the discharge (EDM) process, synthetic discharge electrodes are also used at a smaller scale for making plastic injection moulds.
Special grades, such as the gilsocarbon graphite, can be utilized as a neutron moderator and matrix in nuclear reactors. In the recommended fusion-reactor, it is recommended that low-cross section neutron graphite be used.
The carbon nanotubes can also be found in heat-resistant composites, such as the reinforced carbon-carbon material (RCC). Commercial structures made from carbon fiber graphite materials include golf shafts, bicycle frame, sports car body panels and the body panel of the Boeing 787 Dreamliner.
To prevent static build-up, modern smokeless powders have a graphite coating.
It is found in at least three types of radar-absorbing materials. Sumpf, Schornsteinfeger and rubber are mixed to form U-shaped Snorkels. This reduces the radar cross section. The F-117 Nighthawk floor tiles were also used for secretly hitting fighter jets.
Graphite Composites are used in the LHC beam collection as high-energy particle absorbers.
Graphite Recycling
The most common way to recover graphite occurs when synthetic graphite electrodes are made and then cut up into small pieces, or are discarded in a lathe. Or when the electrodes have been used all the way to the electrode holders. Replace the old with new electrodes. However, most of the older electrodes are still present. After crushing and sizing the graphite, it is used mainly to increase the carbon in molten steel. Some refractory products contain graphite, but the bulk materials that are used to make them (such as bricks of carbon magnesia containing only 15-25 percent graphite), usually have very little graphite. Carbon magnesite can be recovered.

(aka. Technology Co. Ltd., a trusted global chemical supplier & manufacturer has over 12 year's experience in providing high-quality Nanomaterials and chemicals. Our company produces graphite with high purity, small particles and low impurity levels. If you require a lower grade, please do not hesitate to contact us.

2023-07-31

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Application of spherical graphite in the battery industry

What is spherical graphite? Spherical graphite is made of high-quality high-carbon natural flake graphite as raw material, and advanced processing technology is used to modify the graphite surface to produce graphite products with different fineness and shapes like ellipses.
Spherical graphite Application
Spherical graphite material has good electrical conductivity, high crystallinity, low cost, high theoretical lithium insertion capacity, low charge, and discharge potential, and flatness. It is an important part of lithium-ion battery negative electrode material and is used as a negative electrode for lithium-ion battery production at home and abroad. Material replacement products. It has excellent electrical conductivity and chemical stability, high charge and discharge capacity, long cycle life, and environmental protection.
Spherical graphite Preparation
In the process of spherical graphite processing, the graphite dry concentrate is firstly crushed, trimmed, and magnetically separated in the spherical graphite workshop to form the initial product spherical graphite, and then it enters the purification workshop to become spherical graphite (high purity) after high-temperature purification.

Application of spherical graphite in the battery industry
As the world transforms to a clean energy base across electric vehicles (motor vehicles, passenger and heavy transport) and home energy storage, the global demand for cost-effective energy storage solutions continues to drive the growth of the graphite flake market.
Spherical graphite is a crucial ingredient to the efficient operation of lithium-ion batteries (LiB). Spherical graphite is the key component of the anode of a LiB which without, the LiB would not function.
Historically Spherical Graphite has been derived from synthetic graphite, a significantly more costly option when compared against natural flake graphite.
Typically, flake graphite is shaped into a rounded, spherical shape by a mechanical attrition process. The rounded shape of Spherical Graphite allows for more efficient packaging of particles in a LiB anode, which increases the energy and recharge capacity of the LiB.
LiB requires different Spherical Graphite sizes as the Spherical Graphite particle size impacts the performance targets of the LiB. i.e. a small Spherical Graphite particle, d50 of 10 microns, would be used in a LiB that has faster-charging requirements, while a LiB battery that had large power requirements would use a larger Spherical Graphite particle with d50 of 20 microns.
The spheroid graphite is then purified to remove deleterious elements including SiO2, Fe, S, and other metal elements. Various purification techniques are used. These include aggressive acid purification with hydrofluoric acid and thermal purification, using high-temperature furnaces. Both these methods have their advantages and disadvantages.
After purification, the Purified Spherical Graphite is coated to assist with improving the surface and area of the particles. Many LiB manufacturers used their own proprietary technology for coating.
The coated, purified Spherical Graphite is then packed into the shape of the anode required for the LiB batteries.
Test work to date has confirmed that Spherical Graphite is ideally suitable for Lithium-Ion Battery (LiB) applications.

(aka. Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years' experience in providing super high-quality chemicals and Nanomaterials. The Spherical Graphite produced by our company has high purity, fine particle size, and impurity content. Please contact us if necessary.

2023-07-19

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The application and features of Graphite

Ever since we learned our first alphabet, pencils have been used to write. You may have wondered why the lead tip or the silvery black part of the pencil are rolled on wood. It's none other than The graphite is a mineral. Yes, this semimetal is found in pencils. It is a vital element in many products and industries.Graphite, a metal sub-component, is derived as a result of metamorphosing rocks containing carbon. The flaky form is obtained from these carbon rocks. Carbon is the stable form of this metal, which is soft. It is an excellent conductor for electricity, and it also works well as a lubricant. Although it is soft, it has no elastic or stretch properties. There are many applications in the automotive and industrial sectors. We now know that graphite is an element. Let us look at the facts about graphite.
Does the powder come from simply crushing raw graphite to crystals? Though the name suggests otherwise, graphite does not refer to a natural or raw powder. The graphite is a mineral. . What is the form of graphite powder then?
Granulated graphite is also known as powdered powder. The powder can also be made using recycled graphite. The powder can also be produced from scrap material that is left over after the manufacture process and crushing. This can be described as: electrodes made of graphite are discarded after lathe turnings and cutting of manufactured pieces.
During the process of replacing the old electrode with a brand new one, the old electrode remains. What is crushed to make the alumina? The graphite is a mineral. powder. The powdered version is also obtained by heating the powdered petroleum. This is heated above graphitization temperatures and then other procedures are performed to obtain powdered Graphite.

The advantages and disadvantages
Graphite is also used as a powder in paints, and other coating materials. This powder is used to boost the carbon content of certain metals, such as steel. It can also be used as a lubricant to protect surfaces from damage caused by friction. In powder form, the graphite atoms tend to connect to one another like a grid. The stacking of the atoms creates layers. What happens next is that air and water become trapped between the layers.
The lubricating effect is due to this. The powdered form of graphite can be used to make a slurry for oil drilling and brake linings. Due to its dryness and lubricant qualities, this powder is widely used by industries and manufacturing processes. Graphite's high melting point allows it to withstand even high temperatures.
Black lead for pencils is another popular use of powdered lead. Although we call it lead, this is actually powdered lead metal. The graphite is a mineral. . For lubrication, the lock and key mechanism uses powdered graphite. This powder is also a favorite of many artists who use it to create artwork.
The powdered graphite may cause corrosion on certain metals. It can also stain the object lubricated by graphite. We are all familiar with graphite, but we don't know much about it in powder form. Although certain industries have banned the use graphite, its many uses make it valuable to most industries.

(aka. Technology Co. Ltd. has over 12 years experience as a supplier & manufacturer of high-quality chemical materials and nanomaterials. The The graphite is a mineral. Please note that the products produced by our company are of high purity and have low impurities. Please. Contact us if necessary.

2023-07-16

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Convert coal into Nano graphite powder

C onvert coal into Nano graphite Powder A team of international researchers has proven that it only requires 15 minutes for pulverized coke to be converted into high-value coal Nano graphite . Researchers explain how to successfully convert raw coal into Nano-graphite using microwave ovens in a study published in Nano-Structures & Nano-Objects. Nano graphite has many uses, including as a lubricant for fire extinguishers and lithium-ion batteries.
They believe that this "metal assisted microwave processing one step method" is a relatively simple and inexpensive method to convert coal in Wyoming's Powder River Basin. According to TeYu Chen's team at the University of Wyoming despite previous studies showing that microwaves could reduce coal moisture and remove sulfur as well as other minerals but most of these methods required special chemical pretreatment of the raw coal. The experiment only required the pulverization of the coal. After that, put the coal powder on copper foil. Seal it in glass containers with a mix of hydrogen and an argon mixture. Finally, put it into the microwave.
Chris Masi is the lead author. He stated that "by cutting the copper foil in a fork-shaped shape, microwaves will generate sparks. These can create extremely high temperatures of over 1,800 degrees Fahrenheit a few second." The high temperature then transforms pulverized coke. This process also involves copper foil, hydrogen and polycrystalline graphite. The team (which includes researchers from New York Nepal and China) believes this new coal-to-graphite conversion method can improve and be implemented at a large scale in order to produce higher quality graphite materials.

What? It is a good idea to use a bilingual translator Graphite
Graphite This is a natural form of crystalline Carbon. It is a mineral element found in metamorphic or igneous rocks. Graphite can be described as a mineral that is characterized by extremes. It is extremely soft and cleaves easily with very little pressure. It also has a low specific gravity. Compared to other materials, it is highly resistant to heat. This extreme property gives it a variety of uses in manufacturing and metallurgy.
Graphite, a mineral, is formed when carbon is heated and pressed in Earth's crust or upper mantle. To produce graphite, temperatures and pressures between 750°C and 75,000 lbs per square inch are needed. These correspond to granulite facies.
The vast majority of the graphite found on Earth's surface was created at the convergent plates boundaries when organic-rich limestones and shales were subjected under the pressure and heat of regional metamorphism. This results in marble, schist, or gneiss containing tiny crystals of graphite.
If the concentrations of graphite are high enough, the rocks can be mined. They are then crushed into a size that releases the flakes and the low-density material is removed using froth floatation or specific gravity. The product produced is referred to as "flake-graphite."
Metamorphism can lead to the formation of graphite. The organic material of coal is primarily composed of carbon, hydrogen, oxygen and nitrogen. The heat generated by metamorphism destroys coal's organic molecules, releasing hydrogen, oxygen, nitrogen and sulfur. What is left after metamorphism is almost pure carbon that crystallizes to form mineral graphite.
This graphite appears in "seams", which correspond with the original layer coal. This material is mined as "amorphous Graphite." This is not the correct use of "amorphous," as it has a crystalline composition. The material is similar in appearance to coal lumps, without the banding.
Diamonds and Graphite
Graphite Diamond and carbon are two minerals that contain carbon. Diamond is formed in the mantle by extreme heat and pressure. The majority of graphite that is found on Earth's surfaces was formed at lower temperatures and under less pressure in the crust. Graphite has the same chemical composition as diamond but is structurally very different.
The graphite sheets are formed by a hexagonal web of carbon atoms. Each sheet is one atom thick. The sheets are not well connected, and can easily be cleaved or slid over each other when a slight force is applied. Graphite is characterized by its low hardness. It also has a perfect cleavage and slick feel.
Carbon atoms of diamonds, however, are linked in a framework structure. Each carbon atom has strong covalent bonds that link it to four other carbons in a three-dimensional web. The arrangement of the atoms keeps them firmly in position and makes diamond a hard material.

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2023-07-13

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