METHOD OF PRODUCING FLY GRIT MICROSPHERE-BASED SORBENT FOR REMOVAL OF RADIOACTIVE WASTES (VERSIONS) Russian patent published in 2013 - IPC B01J20/30 B01J20/02 G21F9/12 

FIELD: chemistry.

SUBSTANCE: invention relates to sorbents produced on the basis of fly grit microspheres of thermal electric power stations and can be used for removal of radio nuclides from liquid wastes. Synthesis of sorbent comprises deposition of active component on the surface of microspheres by mixing the latter with alkaline metal ferrocyanide solution (arrester), removal of excess arrester solution whereby arrester volume retained by microspheres is defined. Transition metal salt solution is added to the mix of microspheres and arrester to hold the mix to phase separation. Thereafter liquid phase is removed while obtained sorbent is dried. In compliance with second version, sorbent synthesis comprises processing of microspheres with the solution of vanadium, or zirconium or tungsten salts and removal of excess solution whereby salt solution volume retained by microspheres is defined. Thereafter, alkaline metal ferrocyanide solution (arrester) is added thereto, excess arrester solution is removed to hold the mix to phase separation. Thereafter liquid phase is removed while obtained sorbent is dried. In compliance with both versions, sorbent is dried at 60-80°C for 1-2 hours or at a room temperature for 15-20 hours.

EFFECT: efficient removal of cesium, cobalt, cerium, europium, etc.

11 cl, 6 dwg, 6 ex, 1 tbl