Insolubilization of hexavalent chrome, cadmium and lead using composite recycling materials

Abstract

The authors investigated a composite recycling material in which coal ash and blast furnace slag are blended so that the amount of ettringite produced is chemically equivalent to bassanite produced from waste gypsum board in the past study, and the material it is clarified that the ettringite formed in this is extremely effective for insolubilization of fluorine derived from bassanite. In this study, specimens were prepared by adding simulated contaminated water adjusted to an arbitrary concentration by dissolving heavy metal compounds such as hexavalent chromium, cadmium, lead in distilled water to the composite recycled material. We examined the relation between the curing time and elution concentration of these heavy metals and demonstrated the effectiveness of the geotechnical engineering on the insolubilization of heavy metals of composite recycled materials.