uhp graphite electrode sales
When developing artificial graphite with natural graphite as raw material, uhp graphite electrode sales needs to pay attention to the following issues in terms of technology
Surface modification of natural graphite. Compared with carbonaceous raw materials such as petroleum coke and pitch coke, natural graphite has fewer oxygen-containing functional groups on the surface, lower activity, and poor binding force with coal pitch. Therefore, with natural graphite, especially natural flake graphite as the main raw material, the carbon graphite products prepared according to the artificial graphite production process inevitably have the problem of poor mechanical properties.
Uhp graphite electrode sales emphasizes the need for proper surface treatment of natural graphite to increase the content of oxygen-containing functional groups on the surface. Purification of natural graphite. Petroleum coke, pitch coke and other carbonaceous raw materials have high purity, and their ash content is usually less than 0.5%, while the purity of natural graphite after flotation treatment is low, and the carbon content is usually less than 90%. Therefore, natural graphite is used as raw material to prepare Carbon graphite products are often limited in their application fields due to their low purity and poor comprehensive performance. High-purification treatment of natural graphite is one of the ways to solve this problem.
The chemical purification cost is low, but the water consumption in the washing process is large, and the pollution is large, while the high-temperature purification has the problem of high cost. Some people think that it is possible to first prepare block graphite according to the production process of artificial graphite, and then through high temperature heat treatment above 2500℃, the “carbon” phase can be graphitized and the impurities in the natural graphite phase can be removed at the same time, but one is to increase the production Cost, second, defects formed after impurity gasification often cause product performance degradation.
The particle size of natural graphite. uhp graphite electrode sales In order to improve the process performance and product performance, in addition to fine structure carbon graphite products, most carbon graphite products need to use different particle size carbon raw materials in the batching process, some large-size products, carbon raw materials The particle size can even reach 16 mm, and the natural graphite after flotation treatment is often fine powder with a particle size of only tens to hundreds of microns. Therefore, the use of natural graphite as a raw material is limited to the preparation of fine structure carbon graphite products. Although natural microcrystalline graphite of different particle sizes can be obtained, because of its low purity and high cost of high-temperature purification treatment, there is no report on the preparation of crude structure carbon graphite products using natural microcrystalline graphite as a raw material.
uhp graphite electrode sales In order to solve the problem of the lack of large particles of natural graphite, it is recommended to adopt the “secondary coke” process when processing carbon black raw materials in the artificial graphite industry. Volume shrinkage during preparation. In the preparation process of artificial graphite, especially in the graphitization process, because the arrangement of carbon atoms gradually changes to a regular graphite structure, the volume shrinkage of the product is relatively large. The advantage of this volume shrinkage is that it can increase the density of the product, but when the shrinkage is uneven, it is easy to cause the product to crack. When natural graphite is used as a raw material, the density and mechanical properties of the product are lower due to the smaller volume shrinkage during the carbonization and graphitization process.
In addition, when developing artificial graphite with natural graphite as a raw material, it is also necessary to consider the issue of comprehensive production costs. Since the price of natural graphite after flotation is similar to that of calcined petroleum coke and pitch coke, and after purification treatment to a carbon content of 98%, the price of natural graphite is close to twice that of calcined petroleum coke and pitch coke. Except for the aforementioned several types of carbon graphite products that have formed larger industries by uhp graphite electrode sales, most technical routes and technical measures will greatly increase production costs.