Method and device for producing high-purity natural graphite

The invention discloses a method and a device for producing high-purity natural graphite, and belongs to the technical field of the purification of inorganic nonmetallic materials. The method comprises the following steps of: carrying natural graphite powder at the concentration of between 90 and 98 percent into a plasma generator by using inert gas; and when the natural graphite powder passes through a high-temperature zone at the temperature of between 3,500 and 4,000 DEG C which is produced by the plasma generator, gasifying and volatilizing all the ash so as to ensure that the natural graphite powder at the concentration of between 90 and 98 percent is purified to obtain high-purity graphite powder at the concentration of over 99.9 percent. Compared with the conventional method and the conventional device, the invention has the advantages that: the method and the device are environment-friendly and low in energy consumption, the process is simple, the continuous production can be performed, the original crystalline structure of graphite is guaranteed not to be changed, and the like.