Application of Expandable Graphite (I)
1. Sealing material: the raw material high carbon graphite is mixed with concentrated sulfuric acid and concentrated 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 temperatures 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 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: The expandable graphite obtained by high-temperature expansion has rich pore structure, so it has excellent adsorption performance, so it has a wide range of applications in environmental protection and biomedicine. The pore structure of expandable graphite includes open pore and closed pore. The pore volume accounts for about 98%, and it is mainly macroporous, with a pore size distribution range of 1~10. 3 nm. Because it is mainly macroporous and mesoporous, it is also different from microporous materials such as activated carbon in adsorption characteristics. It is suitable for liquid phase adsorption, but not suitable for gas phase adsorption. In liquid phase adsorption, it is lipophilic and hydrophobic, and 1g expandable graphite can adsorb more than 80g heavy oil, so it is a promising environmental protection material for removing oil pollution from water surface. Microbial (bacterial) treatment is often used in wastewater treatment of chemical enterprises. Expandable graphite is a good microbial carrier, especially in the treatment of water polluted by oil and fat organic macromolecules. Due to its good chemical stability and renewable reuse, it has a good application prospect.
3. Medicine: As expandable graphite has the adsorption characteristics of organic and biological macromolecules, it has broad application prospects in biomedical materials.
4. High energy battery material: As 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. The expandable graphite of fluorinated graphite, graphitic acid and metal halides such as AuCl3 and TiF4 has been used in batteries.
After the project is completed, the annual output of spherical graphite will be 2,000 tons, and the annual sales income will be 120 million yuan.
Shandong is one of China's important industrial base provinces. Especially since the reform and opening up, Shandong has not only occupied an important position in the light industry, but also the chemical industry has developed rapidly. After more than two decades of reform and opening up, it has already had a solid foundation.
In 2011, the export situation of flake graphite was relatively sluggish.
Spherical graphite is made of high-quality high carbon natural flake graphite by using advanced processing technology to modify the surface of graphite to produce graphite products with different fineness and oval shape.
High purity graphite means that the carbon content of graphite is more than 99.99%.
Qingdao Jinhui Graphite Co., Ltd.
Nantanpo Village, Zhangshe Town, Pingdu City, Qingdao, Shandong Province, China
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