What is difference for calcined pertoleum coke and artifical graphite?
- Raw materials and production processCalcined petroleum coke:It is derived from petroleum coke. Petroleum coke is a by - product of the oil refining process. The green (un - calcined) petroleum coke contains volatile matter, moisture, and impurities. Calcination is a heat treatment process (usually at temperatures around 1200 - 1350°C) that is mainly used to remove volatile components such as hydrocarbons, sulfur, and moisture from the petroleum coke. This process helps to improve the physical and chemical properties of the coke, such as increasing its density and electrical conductivity to some extent.Artificial graphite:Artificial graphite is usually produced from carbon - rich materials such as coke (including petroleum coke and coal - based coke) and pitch. The production process involves a more complex series of steps. Firstly, the raw materials are mixed and molded into the desired shape. Then, a high - temperature graphitization process is carried out at temperatures above 2500 - 3000°C. This high - temperature treatment causes the carbon atoms to rearrange into a more ordered graphite - like crystalline structure, which gives artificial graphite its characteristic properties such as excellent electrical conductivity and good thermal stability.
- Crystalline structureCalcined petroleum coke:After calcination, the structure of petroleum coke still has a relatively disordered and less - graphitized state. It contains a certain amount of amorphous carbon and has a lower degree of graphitization. The carbon - carbon bond lengths and angles are more irregular compared to graphite.Artificial graphite:Has a well - ordered graphite - like crystalline structure. The carbon atoms are arranged in a layered hexagonal lattice structure, similar to natural graphite. This ordered structure is responsible for its superior electrical and thermal conductivity properties. The layers of carbon atoms can easily slide over each other, giving artificial graphite good lubricating properties in some cases.
- Physical and chemical propertiesDensity:Calcined petroleum coke: Generally has a lower density compared to artificial graphite. The density of calcined petroleum coke usually ranges from 1.4 - 1.6 g/cm3, depending on the quality and origin of the coke.Artificial graphite: Can have a relatively higher density, typically around 1.8 - 2.2 g/cm3. The high - density of artificial graphite is due to its more compact and ordered structure formed during the graphitization process.Electrical conductivity:Calcined petroleum coke: Has a certain level of electrical conductivity, but it is lower than that of artificial graphite. The conductivity of calcined petroleum coke is affected by factors such as its porosity, impurity content, and degree of graphitization. It is usually used in applications where moderate electrical conductivity is required.Artificial graphite: Exhibits excellent electrical conductivity. The well - ordered crystalline structure allows for efficient electron transfer, making it suitable for applications such as electrodes in batteries, electrical contacts, and conductive components in the electronics industry.Thermal conductivity:Calcined petroleum coke: The thermal conductivity is relatively low compared to artificial graphite. It is not as efficient in conducting heat due to its less - ordered structure and possible porosity.Artificial graphite: Has high thermal conductivity, which makes it useful in applications where heat dissipation is crucial, such as in heat sinks for electronics and in high - temperature industrial processes.Chemical reactivity:Calcined petroleum coke: Is more reactive than artificial graphite in some chemical environments. It may be more susceptible to oxidation and chemical reactions due to its less - stable structure and the presence of impurities.Artificial graphite: With its more stable and ordered graphite - like structure, artificial graphite shows better chemical resistance in many cases. It can withstand harsher chemical conditions and has a lower tendency to react with most chemicals under normal conditions.
