▎ 摘　　要

NOVELTY - Preparing a graphene powder comprises (i) grinding the graphite ore and sieve at a room temperature of 10-30 degrees C finely to obtain graphite ore powder, adding the graphite ore powder to the cavity of the mechanical oscillating device to oscillating and adding dilute nitric acid with a concentration of 30-40% at the same time in the cavity of the mechanical oscillating device and pickling the mineral powder once, (ii) feeding the pickled graphite slurry into the primary cleaning and crushing device and performing one cleaning, crushing and microchip peeling on the graphite powder in the graphite slurry, (iii) cleaning the graphite slurry, crushing and inserting microchip peeling into the first-stage separator to separating the liquid and graphite powder, and (iv) inserting the resultant graphite powder into the secondary cleaning and crushing device and performing secondary cleaning, crushing and micro-flake peeling on the graphite powder. USE - The method is useful for preparing a graphene powder. ADVANTAGE - The method: is simple, economical and environmentally friendly; ensures excellent wetting property; adopts industrial processing mode of pipelining; and avoids excessive participation of chemical process. DETAILED DESCRIPTION - Preparing a graphene powder comprises (i) grinding the graphite ore and sieve at a room temperature of 10-30 degrees C finely to obtain graphite ore powder, adding the graphite ore powder to the cavity of the mechanical oscillating device to oscillating and adding dilute nitric acid with a concentration of 30-40% at the same time in the cavity of the mechanical oscillating device and pickling the mineral powder once, (ii) feeding the pickled graphite slurry into the primary cleaning and crushing device and performing one cleaning, crushing and microchip peeling on the graphite powder in the graphite slurry, (iii) cleaning the graphite slurry, crushing and inserting microchip peeling into the first-stage separator to separating the liquid and graphite powder, (iv) inserting the resultant graphite powder into the secondary cleaning and crushing device and performing secondary cleaning, crushing and micro-flake peeling on the graphite powder, (v) secondary cleaning the graphite slurry, crushing and inserting the microchip peeling into the secondary separator to separating the liquid and graphite powder,(vi) inserting the resultant graphite powder into a three-stage cleaning and crushing device and performing three times of cleaning, crushing and microchip peeling on the graphite powder, (vii) inserting the graphite slurry after three times of cleaning, crushing and microchip peeling into a three-stage separator to separating the liquid and graphite powder, (viii) inserting ant the graphite powder into a microwave dryer located in a vacuum environment to drying the graphite powder to remove moisture, (ix) inserting the dried graphite powder into a solid-gas separator in a vacuum environment to separating the graphite powder and liquid, (x) inserting the resultant graphite powder into a plasma modifier located in a vacuum environment to modifying the surface of the graphene to increase the specific surface area of the graphene and increase the wettability, and (xi) storing the modified graphite powder in a storage bin An INDEPENDENT CLAIM is also included for preparation device of graphene powder comprising a primary normal pressure conveying pump, a primary cleaning and crushing device, a primary separating machine, a first vacuum conveying pump, a secondary normal pressure conveying pump, a secondary cleaning and crusher, a secondary separator, a second vacuum conveying pump, a three-stage normal pressure conveying pump, a third-stage cleaning and crusher, a third-stage separator, a third vacuum conveying pump; a microwave dryer, a vacuum pump, a solid-gas separator, a plasma modifying machine and a storage bin. The first-stage normal pressure conveying pump, a first-stage cleaning and crushing device, a first-stage separator, a first vacuum conveying pump, a second-stage normal-pressure conveying pump, a second-stage cleaning and crusher, a second-stage separator, a second vacuum conveying pump, a third-stage normal-pressure conveying pump, a third-stage cleaning and crusher, a third-stage separator, a third vacuum conveying pump, a microwave drying machine, a solid-gas separator, a plasma modifying machine and a storage bin are connected in turn. The vacuum pump is connected with a vacuum chamber and provides a vacuum environment for the vacuum chamber. The microwave dryer, solid-gas separating machine and plasma modifying machine are set in the vacuum chamber.