There are many elements and impurities mixed in the composition process of natural graphite. The carbon content of natural flake graphite is about 98%, and there are more than 20 other non-carbon elements, accounting for about 2%. Expanded graphite is processed from natural flake graphite, so there will be some impurities. The existence of impurities has both advantages and disadvantages. The following editor of Furuite Graphite will explain the influence of impurities on expanded graphite:
1. Advantages of impurities to expanded graphite
Impurities are beneficial to the properties of expanded graphite.
2. Adverse aspects of impurities on expanded graphite
The disadvantage is that the existence of impurities affects the expansion quality of graphite, and may increase the electrochemical corrosion process. Therefore, in the production process of expanded graphite, it is clearly stipulated that the demand for natural flake graphite should be purified.
Furuite graphite reminds everyone that the impurity elements coexisting with graphite ore can be easily eliminated in the acid treatment and cleaning stage. The impurity elements embedded in the middle of graphite layer or constituting interlayer compounds are decomposed, volatilized or increased in the process of high temperature expansion, and about 0.5% of them are oxides and silicates. However, other elements are introduced by acid and water in the production process.
Post time: Feb-08-2023