▎ 摘　　要

NOVELTY - Preparing nano polishing powder comprises (i) preparing graphene by a hummer method to obtaining graphene powder and carrying out high-speed ball milling on graphene powder, (ii) placing the graphene into 25-28 wt.% ammonia aqueous solution, performing ultrasonic oscillation of the cell crushing instrument, when oscillating and heating the ammonia aqueous solution to the 80-90degrees Celsius, stopping ultrasonic oscillation and keeping the temperature at 80-90degrees Celsius for 4-6 hours, naturally cooling, filtering once, diluting and centrifugally separating to obtain a supernatant to obtain an ammoniated graphene aqueous solution, where the pH value of the aqueous solution is 8-8.5 and the concentration of the prepared ammoniated graphene is 2-7 g/l, (iii) adding water into the cerium chloride stock solution to dilute until REO is 60-90 g/l to prepare a cerium chloride solution and slowly titrating to the resultant step aqueous solution. USE - The method is useful for preparing nano polishing powder. ADVANTAGE - The powder: has uniform size, high hardness, excellent fluidity and polishing effect. DETAILED DESCRIPTION - Preparing nano polishing powder comprises (i) preparing graphene by a hummer method to obtaining graphene powder and carrying out high-speed ball milling on graphene powder, (ii) placing the graphene into 25-28 wt.% ammonia aqueous solution, performing ultrasonic oscillation of the cell crushing instrument, when oscillating and heating the ammonia aqueous solution to the 80-90degrees Celsius, stopping ultrasonic oscillation and keeping the temperature at 80-90degrees Celsius for 4-6 hours, naturally cooling, filtering once, diluting and centrifugally separating to obtain a supernatant to obtain an ammoniated graphene aqueous solution, where the pH value of the aqueous solution is 8-8.5 and the concentration of the prepared ammoniated graphene is 2-7 g/l, (iii) adding water into the cerium chloride stock solution to dilute until REO is 60-90 g/l to prepare a cerium chloride solution, slowly titrating to the resultant step aqueous solution, the temperature is normal temperature, the dropping amount is 150-200 ml, the dropping time is 20-30 hours, after finishing dropping and continuously stirring for 10-20 minutes, (iv) heating the solution to 30-35degrees Celsius, adding lanthanum cerium chloride, adding ammonia water with the concentration of 7-8 micromol/l according to the TREO mass (g) of the lanthanum cerium chloride solution and the volume (ml) ratio of the ammonia water of 1:1.5-2 and continuously stirring, where the molar ratio of lanthanum to cerium in the lanthanum cerium chloride is 1:(5-7), (v) heating the solution obtained in the resultant step to 45-55degrees Celsius, slowly adding solid ammonium bicarbonate while stirring according to the proportion of TREO mass (g) of the solution obtained in the resultant step to mass (g) of the solid ammonium bicarbonate of 1:0.7-1, simultaneously detecting the pH value, stopping adding the solid ammonium bicarbonate when the pH value is 6-7 and continuously stirring, (vi) transferring the solution into a hydrothermal reaction kettle, adding specific amount of polyvinylpyrrolidone, sodium citrate and hydrogen sodium oxide and sodium carbonate, where the dosage of sodium hydroxide is 9-12 micromol/l, the dosage of sodium carbonate is 1-2 micromol/l, the dosage of citric acid is 0.5-1 micromol/l, the dosage of polyvinylpyrrolidone is 0.3-0.7 g/l, sealing and the temperature is increased to 290degrees Celsius at 5degrees Celsius/min, carrying out hydrothermal reaction for 12-24 hours, naturally cooling, and then carrying out centrifugal drying on the precipitate to obtain grey white solid powder and (vii) sending the grey white powder into a kiln for calcining at high temperature, heating and roasting the program.