Patent Number: 
Section: claims

1. A method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase, comprising steps of:a) milling a mixture of a molybdenum-containing substance and the radioactively contaminated the radioactively contaminated carbonaceous material by using a planetary ball mill at a fixed ball mill revolution speed to provide first-stage powders;b) placing the first-stage powders obtained in Step a) into a heating furnace, performing a thermal treatment to the first-stage powders under a flowing gas, and then naturally cooling the first-stage powders to provide second-stage powders; andc) adding the second-stage powders to water, and adding an oxidant, such that such that carbon contained therein is oxidized into a gas, and molybdenum-containing moiety is converted into a water-soluble substance,wherein a component ratio between the radioactively contaminated carbonaceous material and the molybdenum-containing substance in Step a) is, in parts by weight, 1 part of the radioactively contaminated carbonaceous material to 2-50 parts of the molybdenum-containing substance. 2. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein a component ratio between the radioactively contaminated carbonaceous material and the molybdenum-containing substance in Step a) is, in parts by weight, 1 part of the radioactively contaminated carbonaceous material to 3.5-50 parts of the molybdenum-containing substance. 3. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein a component ratio between the radioactively contaminated carbonaceous material and the molybdenum-containing substance in Step a) is, in parts by weight, 1 part of the radioactively contaminated carbonaceous material to 2 parts, 3 parts, 3.5 parts, 10 parts, 15 parts, 20 parts, 30 parts, 40 parts or 50 parts of the molybdenum-containing substance. 4. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the gas in Step b) is an inert gas or a gas mixture of hydrogen and an inert gas. 5. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the oxidant in Step c) is one of ozone, hydrogen peroxide, permanganates, and dichromates, or any combination thereof. 6. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the molybdenum-containing substance is one of molybdenum trioxide, molybdenum dioxide, hexaammonium molybdate, phosphomolybdic acid, silicomolybdic acid, and metallic molybdenum, or any combination thereof. 7. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the radioactively contaminated carbonaceous material is radioactively contaminated activated carbon, or radioactively contaminated carbon nanotubes, or radioactively contaminated graphite, or radioactively contaminated carbon fibers, or radioactively contaminated carbon black, or radioactively contaminated resin. 8. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the inert gas is argon or helium. 9. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the thermal treatment in Step b) is to heat at a temperature rise rate of 0.5-20° C./min to a temperature of 500-1100° C., with the temperature being maintained for 1-6 hours. 10. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the thermal treatment in Step b) is to heat at a temperature rise rate of 0.5-20° C./min to a temperature of 900-1100° C., with the temperature being maintained for 1-6 hours. 11. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the thermal treatment in Step b) is to heat at a temperature rise rate of 0.5° C./min, 1° C./min, 2° C./min, 5° C./min, 10° C./min or 20° C./min. 12. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein the thermal treatment in Step b) is to heat to a temperature of 500° C., 600° C., 700° C., 750° C., 800° C., 900° C., 1000° C. or 1100° C. 13. The method of oxidative digestion of a radioactively contaminated carbonaceous material in liquid phase according to claim 1, wherein a duration for temperature maintenance of a high temperature condition in the thermal treatment in Step b) is 1 hour, 2 hours, 4 hours, 5 hours or 6 hours.