1. Surfactant modified graphite
Refers to a particular structure of surfactant treatment and surfactant, so that its hydrophobic end groups are adsorbed on the surface of graphite, and the other end of the hydrophilic group in the water, thereby changing the surface characteristics of graphite, Its hydrophilicity is improved. Modification of graphite with surfactant is one of the earliest methods that can be developed. It has the features of low production cost, simple process design, and obvious wettability to improve higher education.
2. Spheroidization of graphite
Spheroidization refers to the application of external force on the flake graphite. The finely divided scales adhere to each other in the thickness direction or bend the levels, resulting in the reduction of the flake diameter, the thickness becomes more substantial, and it is granular. At this time, due to the width and depth of graphite, The difference between them becomes smaller and gradually loses orientation. After the graphite is spheroidized, the specific surface area of these flakes as graphite is reduced, the surface energy of the enterprise is reduced, and the filling and dispersibility in the castable have been continuously improved. However, this method has a limited degree of improvement in graphite wettability and cannot meet the requirements for graphite used.
3. Surface coating method
The coating method on the surface of graphite material refers to the formation of a layer of hydrophilic material on the surface of the graphite structure using physical or chemical teaching methods, such as oxides, metals, carbides, nitrides, etc. with wettability.
4. Granulation method
Using graphite or other refractory materials as the granulation core, that is, “particle core”, under the action of external force, graphite or other refractory materials are bonded to the surface of the particle core through the binding energy of the binder, and eventually become a specific density when the particle core grows And the strength of large particles.
5. Low-temperature calcined graphite
The surface of graphite 0.45% is volatile organic compounds, which is one of the reasons for the decrease in wetting. After calcining graphite at a low temperature of 300~400℃, its wettability has been improved to a certain extent.
6. Broken green body method
Graphite and other refractory materials are uniformly mixed in a specific ratio and calcined at a certain temperature to obtain high-strength and dense bulk bodies into different sizes of crushed materials. This material is introduced into the unshaped refractory material, and To achieve the purpose of adding a large amount of graphite.