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This graphite product is made with high-quality natural flake graphite. The graphite surface is modified with advanced processing technology to produce graphite products that have different finenesses and elliptical spherical shapes. 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 into small particles. 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 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 -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. It is composed of 95%-96% raw materials and has the lowest comprehensive cost after practice and accumulation.
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 a grading machine.
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 all strong acidic, the purification equipment must be both corrosion-resistant and acid-resistant. 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, the spherical carbonite becomes substandard after it is dried. This is mostly evident in the unqualified indicators and trace elements of carbon content. Drying equipment such as the drying furnace, microwave dryer, and drying kiln are all used.
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