To provide a step preventing the elution of heavy metals, a substantially perfect, environmentally friendly treatment method and a product manufactured thereby at a low cost.
Fly ash, which contains a large amount of salt derived from municipal waste and generates dioxins, is used as a main raw material. Gypsum is added to the fly ash, the resulting composition is reacted at a hydrothermal state during a heating process and modified into calcium chloride and sodium sulfate, and chlorine is released at a low temperature. Here, firing is performed under a strongly reduced condition by embedding the composition in combustibles such as wood flour and adding an iron powder if required, which is used for stabilizing hexavalent chromium as a spinel compound and reducing thermal energy by about 30% at firing.
| WO/2004/002919 | METHOD FOR MANUFACTURING A CERAMIC ARTICLE AND ARTICLE FORMED THEREBY |
| JP2002179477 | POROUS FIRED BODY AND METHOD AND DEVICE FOR PRODUCING THE SAME |
| JP2004035332 | CERAMIC BLOCK |
SHIBUYA RYOJI
IGAMI MINORU
