Method for removal of radioactive cesium and facility therefor

摘要

To provide a method and an apparatus for removing radioactive cesium from waste containing radioactive cesium at low cost. A radioactive cesium removal apparatus 1 including: an incinerator 22 for burning an inflammable waste polluted with radioactive cesium; a suspension preheater 23 for, with the combustion exhaust gas G5 and a sensible heat of the incineration ash of a combustible C discharged from the incinerator, generating calcium oxide or/and magnesium oxide from a source of calcium oxide or/and a source of magnesium oxide, cyclones of the suspension preheater being arranged in multistages; a rotary kiln 21 for burning an inorganic substance S polluted with radioactive cesium together with the calcium oxide or/and the magnesium oxide and the incineration ash D3 including the radioactive cesium; and collectors 31, 32 for collecting cesium volatilized in the rotary kiln.

主权项

1. A radioactive cesium removal method comprising the steps of:
(a) burning an inflammable waste polluted with radioactive cesium to produce a combustion exhaust gas and an incineration ash including the radioactive cesium; (b) generating calcium oxide or/and magnesium oxide from a source of calcium oxide or/and a source or magnesium oxide using a sensible heat associated with both of the combustion exhaust gas and the incineration ash of the inflammable waste; (c) collecting the incineration ash including the radioactive cesium from the combustion exhaust gas; (d) combining said calcium oxide or/and said magnesium oxide, the recovered incineration ash including the radioactive cesium, and an organic substance polluted with radioactive cesium; (e) burning said calcium oxide or/and said magnesium oxide, the recovered incineration ash including the radioactive cesium, and an organic substance polluted with radioactive cesium; and (f) collecting a radioactive cesium volatized during said burning in step (e) by cooling an exhaust gas discharged from the burning in step (e) to obtain a decontaminated product.