This graphite product is made with high-quality natural flake graphite. It also contains advanced processing technology that allows for graphite products to be produced with different levels of fineness and elliptical shape. Spherical graphite has the properties of high electrical conductivity and high crystallinity.
The processing principle is: First, you need to pulverize natural flake graphite powder to a size that can be used for particle size. Next, perform the de-angularization process, which will result in an ellipsoid, or spherical, shape. The fine powder that is removed during this process can be separated and the normal distribution for spherical Graphite can then be obtained.
spherical graphite, raw materials
The particle size of the spherical graphite material should be suitable. Too fine a particle size results in higher costs. A smaller particle size can affect the yield of the spherical graphite. Additionally, too many auxiliary items will increase the price of raw materials. Study have shown that it is easier to use spherical-graphite-making raw materials with a particle size between -100 and -200 mesh.
A very important aspect of spherical-graphite raw materials is their carbon content. Higher carbon contents mean higher costs for raw materials. The lower the carbon content, you will need to use more purification passes. In turn, equipment will wear faster and cost more. After practice and accumulation it contains 95%96% and the total cost is lowest.
Selection criteria for spherical-graphite processing equipment
The airflow vortex-pulverizer is more used in the spherical processing. This has both the performance for pulverization as well as the ability to de-angularize. It is important to consider the quality of the equipment when selecting spheroidized Graphite.
The purity requirements for graphite anode material for lithium-ion cells are typically higher than 99.95%. Purification is an essential part of the production process. Chemical purification is the most common method of producing high-purity, spherical graphite. Since the chemical raw materials used in the production process are strong acids, the purification equipment must be resistant to acid and corrosion. Chemical purification must be completed at a particular temperature. The equipment should also have a high resistance to heat.
After the chemical reactions, the impurities within the spherical graphite are dissolved into the reaction solution. Only then can the impurities be removed by washing. The most common washing equipment in this process is the filter press and centrifuge. The filter press offers many benefits, such as a higher recovery rate, low running material, low labor intensity and safety. However, it has a limited washing effect and can leave dead corners behind that cannot be washed. While the centrifuge offers more washing power and a more effective wash, there are some drawbacks. Combining them works well.
The spherical Graphite after being washed is dried to remove moisture. It is also controlled below 0.5%. The most common problem with drying is secondary pollution. That is, after the spherical carbonite has been washed, it is dried to remove moisture. It is then dried to reduce the moisture level below 0.5%. Drying equipment such as the drying kilns and dryers in microwave ovens is also used.
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