High-value materials from incineration residues of burnable garbage

— Production of silica with high specific surface area from “molten slag”and direct transformation of silica to basic raw material for silicon chemical industry —

Abstract

We developed a technology for producing silica with high specific surface area from molten slag discharged by a garbage disposal plant. The obtained silica has purity and specific surface area comparable to commercially available synthetic silica. Therefore, this silica can be used in various applications, such as in adsorbents, rubber additives, and coating agents. Previous use of silica recycled from molten slag was limited to aggregate for concrete or asphalt. This research result means that silica recycled from molten slag can now be used as a functional material. We also report on “direct synthesis technology of functional chemicals using silica” as the starting point for this research, the research scenario, and future prospects.