Carbon nanotube purification method

The invention relates to the technical field of carbon nanotubes, in particular to a carbon nanotube purification method. Comprising the following steps: (1) mixing carbon nanotubes with ammonium chloride solid powder in a first container, and reacting at 350-400 DEG C; (2) contacting the carbon nanotubes treated in the step (1) with fluidizing gas, oxygen and carbon dioxide in a second container, wherein the reaction temperature is 640-690 DEG C; and (3) mixing the carbon nanotubes treated in the step (2) with fluidizing gas in a third container, and cooling. According to the purification method, the procedures of acid pickling, water treatment and high-energy-consumption drying are omitted, the problems that high energy consumption is caused by high-temperature purification and the conductivity of the carbon nanotubes is seriously damaged are solved, the process is simple and convenient, the operation energy consumption is low, continuous large-scale purification of the carbon nanotubes can be achieved, and