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    The Application of Expandable Graphite

    Time：2023.08.02Browse：1

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    1. Sealing material: the raw material high carbon graphite is mixed with concentrated sulfuric acid and nitric acid for acidification treatment, heat treatment and then pressed into shape. The prepared flexible graphite is a new high-performance sealing material and a nano material grown in situ. Compared with traditional sealing materials such as asbestos rubber, it has good Compressibility, resilience, self-adhesion, low density and other excellent properties, and can be used at high temperature It has been used for a long time under harsh working conditions such as high corrosion. Graphite plates and sealing elements made of it are widely used in aerospace, machinery, electronics, nuclear energy, petrochemical, electric power, shipbuilding, smelting and other industries. Because of its excellent characteristics such as light weight, conductivity, heat conduction, high temperature resistance, acid and alkali corrosion resistance, good resilience, lubrication, plasticity and chemical stability, it is known as the "king of seals" in the world.


    2. Environmental protection field: The expandable graphite obtained by high-temperature expansion has rich pore structure, thus having excellent adsorption performance, and has a wide range of applications in environmental protection and biomedicine. There are two types of pore structures in expandable graphite: open pores and closed pores. The pore volume accounts for about 98%, and is mainly composed of large pores, with a pore size distribution range of 1-10 3 nm, as it is mainly composed of macropores and mesopores, differs from microporous materials such as activated carbon in terms of adsorption characteristics. It is suitable for liquid phase adsorption rather than gas phase adsorption. In liquid phase adsorption, it is lipophilic and hydrophobic. 1 g of expandable graphite can adsorb over 80 g of heavy oil, making it a promising environmentally friendly material for removing oil pollution from water surfaces. Microbial (bacterial) treatment is often used in the treatment of wastewater in chemical enterprises. Expandable graphite is a good microbial carrier, especially in the treatment of water contaminated by organic macromolecules such as oils. Due to its good chemical stability and renewable reuse, it has good application prospects.


    3. Medicine: Due to its adsorption properties for organic and biological macromolecules, expandable graphite has broad application prospects in biomedical materials.


    4. High energy battery material: As a battery material, expandable graphite is converted into electric energy by using the free energy change of the interlayer reaction of expandable graphite. Generally, expandable graphite is used as cathode, lithium is used as anode, or expandable graphite composite Silver oxide is used as cathode, and zinc is used as anode. Expandable graphite with metal halides such as fluorinated graphite, graphite acid, and AuCl3 and TiF4 has been applied to batteries.

    Common preparation methods for expandable graphite

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    The difference between flake graphite and expanded graphite

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    2023-06-15

    Introduction to the characteristics of flake graphite

    1. As a basic raw material, flake graphite can be processed into ultrafine graphite powder, expanded graphite, nano graphite powder, high-purity graphite powder, etc.2. Flake graphite has good lubricity, high temperature resistance, conductivity, etc. Processed into solid graphite lubricant, widely used in mechanical lubrication.3. The quality of flake graphite depends on its carbon content. By purifying flake graphite, it can be processed into high carbon, medium carbon, and low carbon flake graphite. Each type of graphite has a different carbon content, and the higher the carbon content, the better its industrial use.Flake graphite has strong thermal shock resistance and good corrosion resistance, making it the main carbon material for carbon refractory materials. It has important factors affecting the corrosion resistance and high-temperature working strength of carbon refractory design materials such as magnesia carbon bricks. In the actual production process, carbon refractory ma
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    Introduction to Graphite Electrodes

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    Explain in detail the uses of flake graphite?

    Scale graphite is also very common in our daily lives. Because its advantages are quite prominent, there are also many people who choose to use it. Today, I also take this opportunity to introduce to you the uses of flake graphite? If you want to know, come and take a look quickly.Flake graphite is a natural graphite ore with a shape similar to fish scales, and is a hexagonal crystal with a layered structure. Now this product has good acid and alkali resistance, high temperature resistance, conductivity, thermal conductivity, and lubrication performance. Refractory materials and coatings widely used in the smelting industry. Stabilizers for military fireworks such as magnesia carbon bricks and crucibles, desulfurization promoters for the smelting industry, pencil leads, carbon brushes for the electrical industry, electrodes in batteries, catalysts for the chemical industry, etc. Lubricants, release agents, drawing agents, conductive coatings, etc. Flake graphite has a lubricating effe
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    What are the main expansion graphite equipment?

    The difference between expansion graphite and expansion graphite is that expansion graphite is a process of expansion. It has a large volume, and the expansion graphite has no expansion. It has the characteristics of high temperature and rapid expansion. L.Swrite graphite natural graphiteA loose and porous worm -like substance obtained by insertion, water washing, drying, and high temperature puffed. It is one of the expansion graphite production equipment, mainly used for natural grinding processingProcessing link, H/L/MVertical grinding machineIt is a device specializing in graphite, which is very suitable for configuration as expanding graphite equipment.
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    Characteristics of Mechanical Processing of Carbon Materials

    (1) The organizational structure of carbon materials is formed by the preparation of carbon solid aggregate particles and powder raw materials through a series of production processes, so its cutting is composed of a certain number of particles and dust. The large amount of carbon dust generated during the cutting process not only pollutes the operating environment and affects the health of operators, but also the silicon carbide impurities contained in graphite dust can cause certain wear and tear on machine tool components. Therefore, efficient ventilation and dust removal equipment must be installed in the mechanical processing workshop of carbon materials.(2) Carbon material is a heterogeneous and brittle material, with a considerable range of hardness fluctuations. Roasted carbon products have a high hardness, which makes processing more difficult. Graphite products have a low hardness, making them easy to cut and process. The surface roughness of products processed with carbon m
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    Will the performance changes after expanding graphite multiple times?

    Expansion graphite exposure will expand rapidly at high temperatures. It has a certain isolation effect and can be used to extinguish metal fires such as lithium, sodium, potassium, uranium, and cricket. It is a good fire extinguishing agent. In actual use, we found that the functional effect of expansion graphite has a lot to do with the number of expansion of expansion graphite. The following graphite manufacturer editor will explain the function of repeated expansion of expanded graphite:The number of expansion graphite determines the role of expanding graphite. The repeated expansion of graphite powder is fluffy powder, which presents a structure similar to a kneading paper ball on the micro structure, but the active point of the carbon layer edges will increase. When making expansion graphite fire extinguishers, the expansion graphite can be expanded repeatedly. When the expansion graphite expands more than three times, the expansion of the expansion graphite is now less than twi
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    Graph

    Graphite is a raw material that is stable in physical properties, anti -corrosion, and drugs such as acid, alkali and other drugs that is not easy to produce reflected. It is common in the production of processed graphite board, graphite board, graphite anode board, graphite bipolar tablets and other products. Petrochemical equipment, mechanical engineering, electronic device industry chain, China nuclear industry and national defense security are all used in areasBecause graphite can be used to manufacture refractory insulation materials, conductive raw materials, metal composite materials, lubricating liquid, heat -resistant rubber seals, corrosion -resistant raw materials, insulation materials, raw materials, wear resistance and radiation -proof materials, etc.1. Fire. Graphite refractory insulation materials are mainly casting raw materials, magnesium carbon bricks and aluminum graphite refractory insulation materials.2. conductivity. There are also television series graphics card
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    Factors affecting the gasification reaction of carbon materials

    (1) Degree of graphitization: As the degree of graphitization of carbon materials increases, their activity towards gases decreases. The higher the final heat treatment temperature of carbon materials, the higher the temperature at which they begin to oxidize, so graphite products have a higher starting oxidation temperature than carbon products.(2) Structural state: Carbon materials with loose and porous surfaces are prone to react with gases. For example, the surface dense pyrolytic graphite treated at 3200 ℃ begins to oxidize in air at a temperature of 850 ℃, while the porous and loose charcoal on the surface begins to burn at 360 ℃.(3) Catalytic effect of impurities: Carbon materials contain impurities that have a significant impact on their gasification reaction, with varying catalytic effects. For example, iron, cobalt, nickel, copper, manganese, etc. are catalysts for the oxidation of carbon materials, while impurities such as boron, titanium, and tungsten have inhibitory effec
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    graphite expansion graphite environmental materials

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    Calf mineral development overview

    The world's natural graphite output in 2010 was 1.1 million tons. China graphite output is 800,000 tons (crystal graphite and cryptocrystalline graphite), accounting for 73%of the world's output. In the past 30 years, graphite production has ranked first in the world.

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