Time:2023.04.14Browse:1
1. Chemical intervening method: The prepared initial raw materials are high -carbon scales -shaped graphite. The remaining chemical reagents such as concentrated sulfuric acid (more than 98 %), hydrogen peroxide (more than 28 %), potassium permanganate, and other industrial -grade reagents are used The general steps for preparation are: Different proportion of hydrogen dioxide solutions, natural scales, and concentrated sulfuric acids with different proportion at the appropriate temperature with different adding procedures, react for a certain period of time under continuous stirring, and then wash it to neutrality and centrifugal separation. After dehydration, it is dry at 60 ° C vacuum.
2. Electrochemical Law: Treatment of graphite powder in a strong acidic fluid to make expansion graphite, hydrolysis, cleaning and dryness. It mainly uses sulfuric acid or nitric acid as strong acid. Essence
3. Ultrasonic oxidation method: During the process of preparation of swelling graphite, the ultrasonic vibration of the electrolyte oxidation of the anode oxidation is the same as the time of the ultrasonic vibration. Function, thereby speeding up the anode oxidation and shortening the oxidation time.
4. Gas diffusion method: The graphite and insertion objects are separated from the two ends of the real vacuum tube, which is heated at the end of the insertion. The scales graphite layer, so as to expand graphite. The number of stratums that can be expandable graphite produced in this method can be controlled, but its production cost is high.
5. Melving salt method: Mix several insertions with graphite to heated and compound to form expansion of graphite.