Abstract
The cement industry can recycle various kinds of waste materials, for use as raw material or fuel, through the following characteristics in manufacturing: (1) High temperature in the cement kiln can decompose the toxic compounds such as dioxins or chlorofluorocarbons, (2) Elements contained in the ash generated by incinerating most waste material is usable as raw material for cement, (3) Other minor elements in ash can be absorbed into the cement clinker and neutralized.
In this report, research and development on the utilization of used tire, waste plastics and coal ash, recycling sewage sludge, the recycling process of incinerator ash from urban waste (fly ash washing process and ecocement), the recycling process of urban waste (AK process), recovery of heavy metals, decomposition of chlorofluorocarbons and CO2 fixation is discussed. The research and development of Environmental technologies will become increasingly important, because the demand that cement plant utilize waste that is difficult to recycle by ordinary process, is growing.
