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Spherical graphite The processing principle is: First, you need to pulverize natural flake graphite powder into small particles. Next, perform the de-angularization process, which will result in an ellipsoid, or spherical, shape. You can get the normal distribution for spherical graphite from the fine powder that is removed during this process.
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 spherical graphite. Additionally, adding too many products to the mix 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 -100 mesh.
A very important aspect of spherical-graphite raw materials is their carbon content. The carbon content of spherical graphite raw materials is a key factor. The higher the carbon, the more expensive the raw materials. Additionally, the purification passes required to remove it will increase, increasing the equipment’s wear and tear. Also, the overall cost of the equipment will rise. After practice and accumulation it contains 95%-96% of raw material, and the total cost is the 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 grading equipment.
Graphite anode material for lithium-ion batteries must be at least 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, impurities found in the spherical graphite are dissolved into the reaction solution. They can then be washed. 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, it also has 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, when the spherical carbonite has been washed and dried, it becomes substandard because of the inclusion of impurities. This is mostly evident in the unqualified indicators about carbon content or trace elements. Drying equipment such as the drying kilns and dryers in microwave ovens is also used.
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