| 摘要 |
The present invention relates to an efficient cesium decontamination method for the asphalt contaminated by cesium, wherein decontaminating the cesium in an lower level of deregulation concentration by washing and electrokinetic method, and washing the contaminated asphalt with nitric acid with toluene. The method also performs the electrokinetic decontamination additionally if cesium is more than the regulatory concentration. [Reference numerals] (AA) Washing asphalt; (B1) Reuse(3-4 times); (B11) Initial concentration 20Bq/g or greater; (B2) After reuse; (B3,B10) Filtered solution; (B4) Toluene washing solution; (B5) Toluene + coal tar + Cs; (B6,B12) Aggregate; (B7) Reuse; (B8) Hydrochloric acid(or nitric acid) washing solution; (B9) Hydrochloric acid(or nitric acid) + Cs; (CC) Dryer (toluene evaporation); (DD) Asphalt self-disposal; (EE,KK) Precipitation tank; (FF,LL) Concentration tank; (GG,MM) Filter press; (HH,NN) Dryer (Sludge + Cs); (II,OO) Radioactive waste disposal; (JJ) Soil washing; (PP) Electrokinetic decontamination; (QQ) pH control mixing tank; (RR) Aggregate self-disposal; (SS) Asphalt washing-Electrokinetic decontamination experiment process chart |
