Graphite Material
This kind of silicon carbide graphite is molded by 10000 tons hydraulic press and then roasted for several months to make the finished product. Therefore, carbon graphite composite material has high purity and good physical properties. It is widely used in the metallurgical industry, advanced refractory coating, military pyrotechnic material stabilizer, pencil lead for light industry, carbon brush for electronic industry, an electrode for the battery industry, catalyst additive for the chemical fertilizer industry, etc.
High Purity Graphite Material
High purity graphite is a kind of graphite with high purity, and its content is more than 99.9%. It has the advantages of small resistance coefficient, high-temperature resistance, corrosion resistance, oxidation resistance, thermal shock resistance, good conductivity, small thermal expansion coefficient, self-lubrication, easy precision machining, and so on.
Medium And Coarse Graphite Material
The particle size of medium and coarse graphite raw materials is 0.2, 0.4, 0.8, 2, and 4mm, and the density is between 1.55 and 1.75. It has the characteristics of low resistivity, oxidation resistance, corrosion resistance, high-temperature resistance, and good conductivity.
Isostatic Pressing Graphite Material
Isostatic pressing graphite material is made of high-quality petroleum coke and asphalt coke as the main raw materials through pulverization (the average particle diameter is less than 25) μm) Graphite products are made by, kneading, binding, isostatic pressing, roasting, impregnation, graphitization, and other processes.
Briefly introduce the purification method of carbon graphite material
Graphite purification: there are two methods, chemical purification and physical purification.
1. Chemical purification: it is to use the acid, alkali, and corrosion resistance of graphite to treat graphite concentrate with acid and alkali to dissolve impurities and then wash them away to improve the grade of concentrate. High carbon graphite with a 99% grade can be obtained by chemical purification. There are many methods for chemical purification, and the sodium hydroxide high-temperature melting method is widely used in China.
The basic principle is to make impurities (mainly silicate minerals) in graphite react with caustic soda (NaOH) at a high temperature above 500 ℃ to form water-soluble reactants. The reactants can be leached with water to remove some impurities. Another part of impurities, such as iron oxide, can be neutralized with HCl after alkali melting to form soluble ferric chloride, which can be removed by washing with water.
2. Physical purification: that is, high-temperature purification, using the high-temperature resistance of silicon carbide graphite, put it in the electric furnace, isolate the air, and heat it to 2500 ℃, so that the ash (i.e. impurities) can be volatilized, so as to improve the concentrate grade. High purity graphite with 99.9% grade can be obtained by high-temperature purification.
Briefly introduce the purification method of carbon graphite material
The difference between high purity graphite and graphitized materials
The difference between graphite material and carbon material
