Physical closed action for heavy metal in sludge by solidified disposal

Abstract

Heavy metal could be closed in crystal lattice of hydrate or absorbed in surface of hydrate by solidified disposal, which could be named Physical closed action. Physical or chemical action maybe destroy the integrality of hydrate induce the leaching of heavy metal when the solidified sludge was utilized or landfilled. The XRD was used to analyze the integrality of hydrate crystal after the solidified sludge crushed and the leaching test of heavy metal was carried out. The result shows that the physical closed action was valid when grain diameters of solidified sludge exceed 1.0mm though the integrality of hydrate crystal was damaged. But the leaching quantity of heavy metal would increase with the crushed degree increased.