Device and method for preparing sulfur-free expandable graphite by using plasma

The invention relates to a device and a method for preparing sulfur-free expandable graphite by using plasma, which are used in the technical field of expandable graphite preparation. The device comprises a plasma reactor, an intermediate tank, a high-voltage power supply, a gas pump, a graphite solution tank, a solvent gas pressure tank, a gas pressure tank gas inlet, a liquid tank feed port, a liquid tank discharge port, an intermediate tank feed port, an intermediate tank discharge port, a solvent distributor, an electric heater, a gas tank, a stirring device and a discharge port. The plasma reactor is of a gas-liquid dielectric barrier discharge tube type structure, no stirring device is arranged in the plasma reactor, and the effect that graphite makes full contact with plasma activeparticles is achieved through a plurality of liquid return inlets and a suspension liquid distributor. The device is reasonable in design, easy to operate and high in equipment utilization rate, costis saved, energy consumpti