Abstract
Cement-based material is not only economical and excellent for immobilizing heavy metals contaminated in the soil, but it also hardens and develops strength by hydration. However, it is difficult for the material to immobilize lead in high alkali atmosphere due to its amphoteric property and Cr(Ⅵ) which comes out of cement-based materials due to hydration inhibition in clay, especially loam in the Kanto district in Japan. Therefore, we have developed a new material for immobilizing heavy metals, DENITE, which is free from Cr(Ⅵ), and reviewed its immobilizing performance. As some results of the examination, the DENITE is effective to immobilize lead, Cr(Ⅵ) and fluorine due to lower pH(=10-11) and no chromium compounds included, and it is confirmed that heavy metals in soil immobilized by DENITE is stable in acid and alkali condition.
